{"schemaVersion":2,"title":"Hat truss and upper core member inventory","antenna":{"id":"wtc1-antenna","tower":1,"name":"North Tower broadcast mast and hat-truss support relationship","heightAboveRoofFt":360,"roofElevationAboveConcourseFt":1368,"heightSource":"Approximately 360 ft above roof: NIST NCSTAR 1-1 p.7 and 9/11 Memorial Museum object C.2011.179.10. NCSTAR 1-1A p.55 alternatively reports 362 ft; total height remains rounded, not fabrication precision.","relationshipSource":"NIST NCSTAR 1-1 p. 12 and NCSTAR 1-1A section 2.3.8 p. 55: centered mast supported/stabilized by the hat trusses, which connect the core to the perimeter.","constructionSource":{"title":"NIST NCSTAR 1-1C, Appendix E, reproduced LERA March 1986 inspection standards, pp. 228\u2013231","url":"https://www.govinfo.gov/content/pkg/GOVPUB-C13-bffc2781d34258d215e5feb86d2b9ada/pdf/GOVPUB-C13-bffc2781d34258d215e5feb86d2b9ada.pdf","localPath":"analysis/antenna-review/NCSTAR1-1C-appendices.pdf","facts":"18 mast sections, a tapered section and channel 4/5 pole; weatherproof enclosure and radomes. The report identifies a tapered base and microdish-platform outriggers.","sha256":"8415e3993448c25fcfac67235baff5e65fa83c4a5c3a9330d1ffb87004671086"},"supportReferences":[{"memberId":"wtc1-brace-066","endpoint":"end"},{"memberId":"wtc1-brace-071","endpoint":"end"},{"memberId":"wtc1-brace-090","endpoint":"end"},{"memberId":"wtc1-brace-095","endpoint":"end"}],"supportReferenceBasis":"A-A-176 and SA401/402 register the lower frame. 9-A17-7.5\u20137.8 locates eight bearings, inward inclinations and separate R shear connections at 29 ft 6 in above floor 110. Local joint outlines and manufacturer-side mating details remain incomplete.","displayEnvelope":{"status":"reference-informed exterior approximation","radialSegments":32,"profile":[{"id":"base","label":"Flared weatherproof base","bottomAboveRoofFt":0,"topAboveRoofFt":32,"bottomRadiusFt":10,"topRadiusFt":5,"color":"#d5ddda","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements. Lower enclosure uses a photograph-informed square footprint, 20 ft nominal side, transitioning above the 9 ft interface to the round shaft. Enclosure shape and side length remain visual estimates, not plate dimensions.","squareUntilAboveRoofFt":9},{"id":"lower","label":"Lower mast enclosure","bottomAboveRoofFt":32,"topAboveRoofFt":120,"bottomRadiusFt":5,"topRadiusFt":5,"color":"#e0e5df","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"shoulder","label":"Lower enclosure shoulder","bottomAboveRoofFt":120,"topAboveRoofFt":124,"bottomRadiusFt":5,"topRadiusFt":4.5,"color":"#c7d1cc","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"middle","label":"Middle white enclosure","bottomAboveRoofFt":124,"topAboveRoofFt":188,"bottomRadiusFt":4.5,"topRadiusFt":4.5,"color":"#e2e6df","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"neck","label":"Open-array lower transition","bottomAboveRoofFt":188,"topAboveRoofFt":190,"bottomRadiusFt":4.5,"topRadiusFt":2.5,"color":"#89999a","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"spine","label":"Spine inside open upper array","bottomAboveRoofFt":190,"topAboveRoofFt":264,"bottomRadiusFt":2.5,"topRadiusFt":2.5,"color":"#879693","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"radome-lower","label":"Upper white radome \u00b7 lower","bottomAboveRoofFt":264,"topAboveRoofFt":288,"bottomRadiusFt":4.25,"topRadiusFt":4,"color":"#e7e9e2","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"radome-middle","label":"Upper white radome \u00b7 middle","bottomAboveRoofFt":288,"topAboveRoofFt":314,"bottomRadiusFt":3.7,"topRadiusFt":3.5,"color":"#e7e9e2","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"radome-top","label":"Upper white radome \u00b7 top","bottomAboveRoofFt":314,"topAboveRoofFt":336,"bottomRadiusFt":3.1,"topRadiusFt":2.7,"color":"#e7e9e2","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."},{"id":"tip","label":"Thin terminal pole","bottomAboveRoofFt":336,"topAboveRoofFt":360,"bottomRadiusFt":0.5,"topRadiusFt":0.16,"color":"#8a9796","evidence":"Photo-estimated visible exterior: David Holt March 1998 and JWSmythe September 6, 2001. Oblique perspective is unresolved; dimensions are nominal estimates, not drawing measurements."}],"details":{"platforms":[{"id":"platform-0","heightAboveRoofFt":7,"radiusFt":16,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. LERA1986 inspection report confirms tapered-base microdish-platform outriggers."},{"id":"platform-1","heightAboveRoofFt":16,"radiusFt":14,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. LERA1986 inspection report confirms tapered-base microdish-platform outriggers."}],"bands":[{"id":"band-32","heightAboveRoofFt":32,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-78","heightAboveRoofFt":78,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-120","heightAboveRoofFt":120,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-124","heightAboveRoofFt":124,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-188","heightAboveRoofFt":188,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-190","heightAboveRoofFt":190,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-264","heightAboveRoofFt":264,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-288","heightAboveRoofFt":288,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-314","heightAboveRoofFt":314,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."},{"id":"band-336","heightAboveRoofFt":336,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Visible enclosure transitions only; not all18 documented mast splices."}],"racks":[{"id":"lower-array","bottomAboveRoofFt":92,"topAboveRoofFt":120,"radiusFt":5.8,"widthFt":4,"faces":4,"bays":3,"rotationRadians":0.7853981633974483,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"upper-array","bottomAboveRoofFt":190,"topAboveRoofFt":264,"radiusFt":6,"widthFt":7,"faces":4,"bays":4,"rotationRadians":0.7853981633974483,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."}],"dtv":{"bottomAboveRoofFt":124,"topAboveRoofFt":158,"radiusFt":5.8,"panelWidthFt":1.7,"columnPitchFt":2,"rows":6,"rotationRadians":0,"sides":[{"back":false,"columns":2},{"back":true,"columns":1}],"evidence":"Doug Lung contemporaneous RF account documents two opposed arrays, unequal panel counts and one rear column. September6,2001 photograph shows slim midshaft addition. Exact count, elevation, azimuth and panel dimensions are estimates; front two-column representation is illustrative."},"microwaveDishes":[{"id":"microwave-0-0","heightAboveRoofFt":10,"distanceFromCenterFt":16.5,"azimuthRadians":0.1,"radiusFt":2.5,"color":"#9cadab","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-0-1","heightAboveRoofFt":10,"distanceFromCenterFt":16.5,"azimuthRadians":1.1,"radiusFt":2.1,"color":"#d7ded9","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-0-2","heightAboveRoofFt":10,"distanceFromCenterFt":16.5,"azimuthRadians":2.9,"radiusFt":2.5,"color":"#9cadab","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-0-3","heightAboveRoofFt":10,"distanceFromCenterFt":16.5,"azimuthRadians":4.4,"radiusFt":2.1,"color":"#d7ded9","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-1-0","heightAboveRoofFt":19,"distanceFromCenterFt":14.5,"azimuthRadians":0.15,"radiusFt":2.5,"color":"#9cadab","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-1-1","heightAboveRoofFt":19,"distanceFromCenterFt":14.5,"azimuthRadians":1.3,"radiusFt":2.1,"color":"#d7ded9","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-1-2","heightAboveRoofFt":19,"distanceFromCenterFt":14.5,"azimuthRadians":2.1,"radiusFt":2.5,"color":"#9cadab","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-1-3","heightAboveRoofFt":19,"distanceFromCenterFt":14.5,"azimuthRadians":3.4,"radiusFt":2.1,"color":"#d7ded9","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-1-4","heightAboveRoofFt":19,"distanceFromCenterFt":14.5,"azimuthRadians":4.4,"radiusFt":2.5,"color":"#9cadab","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."},{"id":"microwave-1-5","heightAboveRoofFt":19,"distanceFromCenterFt":14.5,"azimuthRadians":5.4,"radiusFt":2.1,"color":"#d7ded9","evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule. Circular dish radomes corroborated by close base reference; hidden-side inventory unresolved."}],"radiatorLoops":[{"id":"lower-loop-0-0","heightAboveRoofFt":80,"distanceFromCenterFt":6,"azimuthRadians":0.0,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-0-1","heightAboveRoofFt":80,"distanceFromCenterFt":6,"azimuthRadians":1.5707963267948966,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-0-2","heightAboveRoofFt":80,"distanceFromCenterFt":6,"azimuthRadians":3.141592653589793,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-0-3","heightAboveRoofFt":80,"distanceFromCenterFt":6,"azimuthRadians":4.71238898038469,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-1-0","heightAboveRoofFt":85,"distanceFromCenterFt":6,"azimuthRadians":0.0,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-1-1","heightAboveRoofFt":85,"distanceFromCenterFt":6,"azimuthRadians":1.5707963267948966,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-1-2","heightAboveRoofFt":85,"distanceFromCenterFt":6,"azimuthRadians":3.141592653589793,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-1-3","heightAboveRoofFt":85,"distanceFromCenterFt":6,"azimuthRadians":4.71238898038469,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-2-0","heightAboveRoofFt":90,"distanceFromCenterFt":6,"azimuthRadians":0.0,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-2-1","heightAboveRoofFt":90,"distanceFromCenterFt":6,"azimuthRadians":1.5707963267948966,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-2-2","heightAboveRoofFt":90,"distanceFromCenterFt":6,"azimuthRadians":3.141592653589793,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},{"id":"lower-loop-2-3","heightAboveRoofFt":90,"distanceFromCenterFt":6,"azimuthRadians":4.71238898038469,"radiusFt":1.4,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."}],"ladder":{"bottomAboveRoofFt":32,"topAboveRoofFt":120,"radiusFt":5.2,"rungPitchFt":1.25,"evidence":"Feature visible in reference photographs; simplified dimensions, component count, spacing and azimuth are estimates. Not a recovered fabrication schedule."},"mounting":{"evidence":"Visible attachment envelopes informed by the Holt 1998 mast photograph and the close rooftop photographs reproduced by Fybush in September 2001. Stand-offs, backing rails, dish housings and deck cradles connect the modeled equipment to its parent surface. Exact bracket geometry, spacing, shell penetrations and fasteners are not resolved."}},"uncertainty":{"status":"reference-informed exterior approximation; all non-total dimensions below are estimates, not fabrication dimensions","nominalStationsFt":{"base":0,"dishDeckLower":7,"dishDeckUpper":16,"flareToStraightShaft":32,"lowerArrayBottom":78,"lowerArrayTop":120,"upperCageBottom":190,"upperCageTop":264,"whiteUpperRadomeTop":336,"thinTipTop":360},"stationRangesFt":{"flareToStraightShaft":[25,40],"lowerArrayTop":[110,140],"upperCageBottom":[175,210],"upperCageTop":[250,280],"whiteUpperRadomeTop":[329,342]},"diameterEstimatesFt":{"baseFlare":[18,24],"mainShaft":[9,12],"middleShaft":[8,10],"upperCageSpine":[4,6],"upperCageOuterEnvelope":[13,17],"upperWhiteRadomeBottom":[7,9],"upperWhiteRadomeTop":[5,6],"thinTip":[0.5,1.2],"basePlatformOuterEnvelope":[26,34]},"fitPriorities":"Match total height, broaden main shaft, resolve flared base and decks, open cage and stepped top. Keep array counts/azimuths modest and explicitly estimated rather than imply station-level exactness."},"note":"Total height and support arrangement have documentary sources. Profile, equipment sizes, intermediate elevations, counts and orientation remain photo estimates. Visible equipment mounts are simplified connection envelopes, not recovered fabrication details. The 18 structural mast sections are not these 10 display intervals; see roofInterface for the separately reviewed building-side connection."},"unresolved":["Final TV-series antenna fabrication and manufacturer-side mating connection drawings.","Plan B-B is mirrored across its two marked centerlines: four Q corners, two S and two T side positions. Interface coordinates are dimensioned; lower joints retain the scheduled nominal frame coordinates. Inclinations interpolate those two sets of controls, not surveyed as-built axes.","Variable plate widths, rolled-section contours, local gusset outlines, weld preparations and some lower splice components remain simplified. R shear assemblies show their located plate forms; manufacturer-side steel and bolts are omitted.","The building-side interface is modeled. Manufacturer-side mating steel, bolts, weld preparation and final 2001 alterations remain unresolved.","9-B23-1 is a South Tower future-post detail; it is not used for this North Tower mast.","No structural capacity, stiffness or wind-response calculation is implied.","The traced east cover perimeter intersects the inward T-channel flange envelopes. The concrete curbs themselves clear the steel. The east cover is a marked wire outline, not an asserted solid installation; actual edge treatment, later modifications and roof datum require further evidence.","Roof curb outlines are calibrated traces; cable inventory and final roof-surface datum remain unresolved.","Exterior profile, equipment dimensions and exact 2001 inventory remain photograph-informed estimates."],"analysisScope":"Shared geometric assembly and documented support relationship only; no load, stiffness, wind response or failure calculation. No antenna is installed on WTC 2.","modelRevision":"2001-equipment-mounts-20260914-eight-bearing-interface","referenceSources":[{"fact":"Approximately 360 ft overall mast above North Tower roof.","sources":["NIST NCSTAR 1-1 p.7","https://collection.911memorial.org/Detail/objects/6223/rel/1","https://www.911memorial.org/learn/resources/digital-exhibitions/world-trade-center-history/world-trade-center-facts-and-figures"],"note":"NCSTAR1-1A p55 gives 362ft. Retain360 as existing rounded model height, record discrepancy; no fake precision."},{"fact":"Recovered antenna fragment dimensions 119 by125 by239 inches, museum object C.2011.179.10 donated by PANYNJ.","source":"https://collection.911memorial.org/Detail/objects/6223/rel/1","inference":"Roughly10ft main shaft size is plausible, but these are overall damaged artifact dimensions including protrusions, not nominal fabricated diameter."},{"fact":"Museum dates high-definition TV master antenna installation to2000.","source":"https://collection.911memorial.org/Detail/objects/6223/rel/1","note":"Do not describe1999 as a fully settled as-built completion date; wider retellings say1999. Use final2001 configuration."},{"fact":"LERA1986 inspection standards identify18 tower sections, tapered section, channel4/5 pole, radomes/weatherproof enclosure, and microdish platforms on tapered-base outriggers.","source":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-1cv2.pdf","localPath":"analysis/antenna-review/NCSTAR1-1C-appendices.pdf","pages":"228\u2013231; PDF108\u2013111"},{"fact":"LERA names top of Section AC-10 as elevation101 and describes bottom101ft of antenna structure.","source":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-1cv2.pdf","pages":"229,231","note":"Do not map this section identifier to an exterior visual transition without missing TV-series fabrication sheets."},{"fact":"DTV used two opposed Dielectric UHF panel arrays, with more panels toward majority population and single column on opposite mast side.","source":"https://www.tvtechnology.com/opinions/antennamounting-issues","author":"Doug Lung, broadcast RF engineer","note":"Contemporaneous primary practitioner description. Original photo is absent in current migrated HTML; use dated2001 photograph to confirm visual silhouette."},{"id":"holt1998","file":"holt-1998.jpg","author":"David Holt","captureDate":"1998-03-01","url":"https://commons.wikimedia.org/wiki/File:1WTC_Antenna_Mast_March_1998.jpg","originalUrl":"https://upload.wikimedia.org/wikipedia/commons/9/99/1WTC_Antenna_Mast_March_1998.jpg","license":"CC BY-SA2.0","use":"High-resolution profile, main shells, two array zones, base platforms. Predates DTV retrofit; cannot alone define2001 attachments.","sha256":"3b8e7c0734eba4e7d1e9bc77dc45032570fdd706cd6cdd26c94c8616912cf7b5"},{"id":"smythe2001","file":"smythe-20010906.jpeg","author":"JWSmythe","captureDate":"2001-09-06","url":"https://commons.wikimedia.org/wiki/File:2WTC_roof_to_1WTC_roof.jpeg","originalUrl":"https://upload.wikimedia.org/wikipedia/commons/1/1e/2WTC_roof_to_1WTC_roof.jpeg","license":"CC BY3.0","use":"Whole final2001 silhouette, small new midshaft side panel visible. Low450\u00d7600pixel resolution limits measurements.","sha256":"0176ec8190ff7e8010e286db06472f2cc24433a88cb499ade23cc155f68d5c2a"},{"id":"fybushTower","file":"fybush-wtctower.jpg","author":"Credited by Fybush to Transmitter Sites from Hell (www.netfeed.com/~jhill); photographer not independently verified","publicationDate":"2001-09-12","url":"https://www.fybush.com/site-010912.html","originalUrl":"https://www.fybush.com/Tower%20Site/010912/wtctower.jpg","license":"Copyright reference; research use only; not attributed to Fybush as photographer","use":"Near mast cladding, ladder/cables, lower arrays, exposed upper cage. Strong upward perspective; do not measure heights by linear pixels.","sha256":"700fc4be21f17aad1e5ff01027b3edc78352e9cff9c6c7078caf6e34dec47641","originalSourcePage":"https://www.netfeed.com/~jhill/wtc-newyork.htm"},{"id":"fybushBase","file":"fybush-wtcbase.jpg","author":"Credited by Fybush to Transmitter Sites from Hell (www.netfeed.com/~jhill); photographer not independently verified","publicationDate":"2001-09-12","url":"https://www.fybush.com/site-010912.html","originalUrl":"https://www.fybush.com/Tower%20Site/010912/wtcbase.jpg","license":"Copyright reference; research use only; not attributed to Fybush as photographer","use":"Two broad dish-platform tiers, railings and outriggers, flared mast above; disk-faced microwave dishes, not little generic spheres.","sha256":"aaea6fe13553e457e44b5d187d2448d5ce1a667717868c51c7789aa960587463","originalSourcePage":"https://www.netfeed.com/~jhill/wtc-newyork.htm"}],"roofInterface":{"revision":"roof-interface-eight-bearings-20260914","status":"Dimensioned eight-bearing interface; lower joints and variable-width plates remain simplified.","source":{"path":"sources/WTCI-000030-L.PDF","sha256":"b9a07815219c4bd0c1deb8ad03c109827f4b74353094181ef96f2841c2c750c6","url":"https://archive.org/download/WTCI000031L/Drawing%20Book%209/WTCI-000030-L.PDF","sheets":["9-A17-7.1","9-A17-7.2","9-A17-7.3","9-A17-7.4","9-A17-7.5","9-A17-7.6","9-A17-7.7","9-A17-7.8"],"pdfPages":[267,268,269,270,271,272,273,274],"relatedSource":{"path":"sources/WTCI-000031-L.PDF","sha256":"a2d408832909804853f6bb3338d0f81907bd2c6047bd02d4798b812d45146eb4","url":"https://archive.org/download/WTCI000031L/Drawing%20Book%209/WTCI-000031-L.PDF","sheets":["9-A18-5.2","9-A18-5.3"],"pdfPages":[29,30]}},"interfaceAboveFloor110Ft":29.5,"interfaceDatumEvidence":"9-A17-7.6 / 7.7 / 7.8: interface 29 ft 6 in to reference floor 110.","bearing":{"widthFt":2.1041666666666665,"depthFt":2.1041666666666665,"thicknessFt":0.375,"holeDiameterFt":0.2604166666666667,"secondaryHoleDiameterFt":0.23958333333333334,"holePitchFt":1.1041666666666667,"evidence":"9-A17-7.5\u20137.8: four holes on a 13.25 in square; 6 in edge distances. Q bores 3.125 in; S/T bores 2.875 in. Note 4: 5 in stock, minimum average finished thickness 4.5 in. Display uses that minimum. Bore axes follow the reconstructed inclinations."},"stiffenedHead":{"heightFt":3,"webThicknessFt":0.2916666666666667,"stiffenerThicknessFt":0.10416666666666667,"depthFt":1.6666666666666667,"evidence":"9-A17-7.8 e-e/g-g: 3 ft upper stiffener region, Q web 3.5 in, outer stiffeners 1.25 in; 17-7.4 x-x gives 20 in transverse stiffener extent. Display follows the reconstructed inclination; intermediate variable widths remain nominal."},"leg":{"section":"24WF145","depthFt":2,"widthFt":1.1666666666666667,"evidence":"9-A17-7.1 Plan A-A identifies 24WF145 running between the corner roof connections. It is not evidence for four vertical posts. WF silhouette remains nominal; local plate-Q transitions and connection eccentricities are simplified."},"gusset":{"thicknessFt":0.10416666666666667,"runFt":3,"dropFt":3,"evidence":"9-A17-7.2 / 7.3 specify 1.25 in gusset. Simplified 3 ft footprint follows the illustrated joint, not a shop-cut outline; no inferred bolt pattern."},"limitations":["Plan B-B is mirrored across its two marked centerlines: four Q corners, two S and two T side positions. Interface coordinates are dimensioned; lower joints retain the scheduled nominal frame coordinates. Inclinations interpolate those two sets of controls, not surveyed as-built axes.","Variable plate widths, rolled-section contours, local gusset outlines, weld preparations and some lower splice components remain simplified. R shear assemblies show their located plate forms; manufacturer-side steel and bolts are omitted.","The building-side interface is modeled. Manufacturer-side mating steel, bolts, weld preparation and final 2001 alterations remain unresolved.","9-B23-1 is a South Tower future-post detail; it is not used for this North Tower mast.","No structural capacity, stiffness or wind-response calculation is implied.","The traced east cover perimeter intersects the inward T-channel flange envelopes. The concrete curbs themselves clear the steel. The east cover is a marked wire outline, not an asserted solid installation; actual edge treatment, later modifications and roof datum require further evidence."],"layout":{"halfSpacingFt":6.557291666666667,"cornerAboveFloor110Ft":17.875,"centralFrameAboveFloor110Ft":18.666666666666668,"shearFromCornerFt":3,"evidence":"9-A17-7.5 Plan B-B and 7.6/7.7: Q to S/T centerline 6 ft 6 11/16 in; 3 ft from Q to R shear connection. Mirror only about the two explicit symmetry centerlines. 7.4 lower Q workpoint: 17 ft 10.5 in above floor 110. 9-A18-5.2/5.3 central beam reference: 18 ft 8 in above floor 110.","bearingStations":[{"id":"q-0","type":"Q","centerFt":[-6.557291666666667,-6.557291666666667],"supportIndex":0},{"id":"q-1","type":"Q","centerFt":[6.557291666666667,-6.557291666666667],"supportIndex":1},{"id":"q-2","type":"Q","centerFt":[-6.557291666666667,6.557291666666667],"supportIndex":2},{"id":"q-3","type":"Q","centerFt":[6.557291666666667,6.557291666666667],"supportIndex":3},{"id":"s-0","type":"S","centerFt":[0,-6.557291666666667],"supportIndices":[0,1]},{"id":"s-1","type":"S","centerFt":[0,6.557291666666667],"supportIndices":[2,3]},{"id":"t-0","type":"T","centerFt":[-6.557291666666667,0],"supportIndices":[0,2]},{"id":"t-1","type":"T","centerFt":[6.557291666666667,0],"supportIndices":[1,3]}]},"secondarySupports":{"sWebThicknessFt":0.08333333333333333,"sHeadWebThicknessFt":0.2916666666666667,"sLowerHalfWidthFt":3,"tBraceDepthFt":1.5,"tBraceSection":"2-MC18x58","tBraceFlangeWidthFt":0.35000000000000003,"tBraceWebThicknessFt":0.05833333333333333,"tBraceFlangeThicknessFt":0.052083333333333336,"tBraceSpacerFt":0.08333333333333333,"evidence":"9-A17-7.6/7.8 and 9-A18-5.2/5.3: S spreads onto the central 704/705 frame; upper web 3.5 in, lower web 1 in. 7.4/7.7: T is braced to the corner connections by paired 18-in, 58-lb channels (the bracket-shaped channel symbol was previously transcribed J). Section sketch shows back-to-back webs with 1 in spacer plates at 2 ft intervals. MC18x58 dimensions from Chatham Steel structural-shapes table: 18 in depth, 4.2 in flange width, 0.7 in web and 0.625 in flange; fillets and flange taper omitted. Intermediate variable plate widths remain approximate.","sectionReference":"https://www.chathamsteel.com/PDFs/2021StructuralShapes.pdf"},"shear":{"plateThicknessFt":0.041666666666666664,"plateWidthFt":2.375,"plateDepthFt":0.75,"holeDiameterFt":0.09375,"holeOffsetsFt":[-0.8125,-0.5625,-0.3125,0.0,0.3125,0.5625,0.8125],"evidence":"9-A17-7.5 Note 3 and 7.6/7.7 y-y/z-z: separate R connections for horizontal wind shear. Seven holes, 1.125 in diameter; pitch chain 3,3,3.75,3.75,3,3 in. Half-inch horizontal plate, 9 in depth; manufacturer bolts/mating assembly not included. Lower shear-web outline remains simplified."},"roof":{"source":"A-A-176 Part Plan at Base of Mast and Detail A","sourcePath":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-176.tif","traceAsset":"assets/antenna-roof-plan.png","openings":[{"id":"west","centerFt":[-5.242,0.319],"coverSizeFt":[4.0934,8.7949],"outerSizeFt":[3.0934,7.7949],"tracePixels":[512,238,610,431],"coverStatus":"drawing-envelope"},{"id":"center","centerFt":[-0.0418,0.1823],"coverSizeFt":[5.7224,11.6203],"outerSizeFt":[4.7224,10.6203],"tracePixels":[617,204,754,459],"coverStatus":"drawing-envelope"},{"id":"east","centerFt":[5.5135,0.1595],"coverSizeFt":[4.4693,13.0329],"outerSizeFt":[3.4693,12.0329],"tracePixels":[765,188,872,474],"coverStatus":"unresolved-reference-outline"}],"curbWallFt":0.5,"curbHeightFt":1,"coverOverhangFt":0.5,"coverThicknessFt":0.020833333333333332,"calibration":{"columnPixels":[483,890,130,525],"columnSpacingFt":[17,18],"uncertaintyFt":0.25},"evidence":"Three solid cover-panel outlines traced from A-A-176 using the 17 x 18 ft column grid. The dashed concrete curb below is inset 6 in from the cover perimeter; the next 6 in is curb wall. Detail A, read in the dimension-text orientation, gives 1 ft curb rise (the earlier 3 ft transcription was wrong), insulated quarter-inch cover plates, neoprene gaskets and metal flashing. Absolute roof-surface elevations remain unresolved; local surface is displayed at the existing nominal roof datum.","cableInventory":"Cable count, diameter and routing are unresolved. Covers have no invented cable/hole array; the review can lift them to inspect the three passages.","coordinationIssue":"The traced east cover perimeter intersects the inward T-channel flange envelopes. The concrete curbs themselves clear the steel. The east cover is a marked wire outline, not an asserted solid installation; actual edge treatment, later modifications and roof datum require further evidence."}},"exteriorRevision":"equipment-mounts-20260914"},"coordinateSystem":{"units":"feet","startEndOrder":["east","heightAboveFloor107","south"],"origin":"Tower plan center, floor 107 nominal datum","sourceOriginCenterFt":[103.58333333333333,103.58333333333333],"transform":{"wtc1":"east = 103 7/12 - ABS.X; south = 103 7/12 - ABS.Y","wtc2":"east = 103 7/12 - ABS.Y; south = ABS.X - 103 7/12"},"orientationEvidence":"SA401 north-arrow key plan: WTC1 501 NW, 508 NE, 1001 SW. NCSTAR 1-2 Fig.7-42: WTC2 508 NW, 501 SW, 1001 SE.","perimeterGridWidthFt":207.16666666666666},"levels":[{"id":"107","label":"Floor 107","heightFt":0.0},{"id":"108","label":"Floor 108","heightFt":17.5},{"id":"109","label":"Floor 109","heightFt":31.5},{"id":"110","label":"Floor 110","heightFt":43.166666666666664}],"roofProfile":{"datum":"above floor 110","lowSupportFt":12.333333333333334,"rows600900CentralSupportFt":15.458333333333334,"rows700800CentralSupportFt":18.666666666666668,"evidence":"SA401\u2013SA402 dimensioned roof support elevations; local column tips and joint offsets are omitted","note":"A nominal support profile, not one flat roof plane or an architectural roof surface."},"scope":{"towers":[1,2],"inventoryBasis":"Separate Tower A and B schedule records; source geometry matches, section/grade differences are preserved.","drawingApplicability":"SA401\u2013404 corroborate Tower A. Tower B nominal layout uses its own schedule and the same A profile; B roof heights are not independently verified.","geometry":"Floor-level educational reconstruction. Source section names and topology are retained; this is not connection-exact fabrication geometry or a validated structural analysis model.","notIncluded":["Complete horizontal floor beams and diaphragm bracing","Connection plates, bolts, welds, stiffeners, and section roll orientation","Remaining unresolved numeric/blank brace endpoints, including mast-support details","Fabrication geometry of the antenna shaft and its attachment joints (exterior is photograph-informed; attachment joints remain unresolved)","Full roof cladding and slab geometry"],"missingCoordinatePolicy":"Missing source endpoints are retained with modelable:false and null coordinates, never extrapolated.","columnCoverage":"Schedule columns only; four 108\u2013110 records per tower lack upper coordinate entries and remain unmodeled.","gradePolicy":"Only explicit Fy entries become numeric strengths; blank cells are not filled down or assumed to be 50 ksi."},"sources":[{"id":"roof-truss-xls","title":"WTC \u2013 Roof Truss: coordinate, brace location A/B, column location A/B","path":"sources/LERA - PLANS-022102/tvmast/WTC - Roof Truss.xls","sha256":"ec99920304051b0e30623b50eb974591d442e0cc56d5fafeb06d0aad99d28c04","type":"engineering schedule"},{"id":"wtc2-orientation","title":"NIST NCSTAR 1-2, Fig. 7-42, printed page 233: WTC2 column identity orientation","path":"sources/NCSTAR1-2.pdf","reviewedImage":"site/assets/fig7-42_damage_WTC2_p1.png","use":"Column identity and plan rotation only, not impact-floor geometry"},{"id":"SA401","title":"SA401: TV mast support elevations, Tower A","path":"sources/LERA - PLANS-022102/tvmast/CD_14_PAC1/SA401.TIF","sha256":"de496d3c6761ab1e08638f52b586f2d47856a1f743fcc272ced7ffe9d085efa8"},{"id":"SA402","title":"SA402: TV mast support elevations, Tower A","path":"sources/LERA - PLANS-022102/tvmast/CD_14_PAC1/SA402.TIF","sha256":"ff3cc33fb3a1e4144c17565ec5f2f3879bbeade5522a6615a45187e667788f70"},{"id":"SA403","title":"SA403: TV mast support elevations, Tower A","path":"sources/LERA - PLANS-022102/tvmast/CD_14_PAC1/SA403.TIF","sha256":"227d06cd41c7dd3fe8a93662d0e60bedf73fa6495eafef589bed0ebc45b6b5be"},{"id":"SA404","title":"SA404: TV mast support elevations, Tower A","path":"sources/LERA - PLANS-022102/tvmast/CD_14_PAC1/SA404.TIF","sha256":"43f16286bd3801a4377a7d8b7f6f0783bb0c350166ed8864eeb695aed221c475"}],"members":[{"id":"wtc1-brace-003","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":3,"range":"A3:I3","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[4,5]},"sourceEndpoints":{"start":{"column":"501","level":107.0,"offsetFlag":"A"},"end":{"column":"502","level":108.0,"offsetFlag":""}},"yieldStressKsi":50.0,"yieldStressBasis":"explicit schedule cell","notes":["Source above/below endpoint flags retained; their unquantified offsets are not applied."],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-66.041667,0.0,-41.75],"end":[-45.666667,17.5,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-004","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":4,"range":"A4:I4","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[6,7]},"sourceEndpoints":{"start":{"column":"503","level":107.0,"offsetFlag":""},"end":{"column":"504","level":108.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-24.666667,0.0,-41.75],"end":[-3.0,17.5,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-005","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":5,"range":"A5:I5","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[8,9]},"sourceEndpoints":{"start":{"column":"506","level":107.0,"offsetFlag":""},"end":{"column":"505","level":108.0,"offsetFlag":"B"}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":["Source above/below endpoint flags retained; their unquantified offsets are not applied."],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[24.75,0.0,-41.75],"end":[3.0,17.5,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-006","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":6,"range":"A6:I6","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[10,11]},"sourceEndpoints":{"start":{"column":"508","level":107.0,"offsetFlag":"A"},"end":{"column":"507","level":108.0,"offsetFlag":""}},"yieldStressKsi":50.0,"yieldStressBasis":"explicit schedule cell","notes":["Source above/below endpoint flags retained; their unquantified offsets are not applied."],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[66.041667,0.0,-41.75],"end":[45.666667,17.5,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-007","tower":1,"section":"18x26 BOX 4-1A","category":"outrigger","source":{"id":"roof-truss-xls","sheet":"brace location A","row":7,"range":"A7:I7","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[4]},"sourceEndpoints":{"start":{"column":"PERIMETER","level":108.0,"offsetFlag":""},"end":{"column":"501","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":["Box dimensions describe the outside envelope; wall thickness is not assigned.","Perimeter attachment uses the truss-frame grid and 6\u00bd in inset; plate and bolt workpoints are not modeled."],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","sectionDimensionsFt":{"depth":2.1666666666666665,"width":1.5},"sourceSectionOutsideDimensionsIn":[18,26],"sectionOrientation":"Roll orientation is illustrative; schedule supplies two outside dimensions only.","start":[-103.041667,17.5,-41.75],"end":[-66.041667,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":["SA401\u2013SA404: perimeter-grid workpoint inset 6\u00bd in"]},{"id":"wtc1-brace-008","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":8,"range":"A8:I8","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[4,5]},"sourceEndpoints":{"start":{"column":"502","level":108.0,"offsetFlag":""},"end":{"column":"501","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-45.666667,17.5,-41.75],"end":[-66.041667,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-009","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":9,"range":"A9:I9","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[5,6]},"sourceEndpoints":{"start":{"column":"502","level":108.0,"offsetFlag":""},"end":{"column":"503","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-45.666667,17.5,-41.75],"end":[-24.666667,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-010","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":10,"range":"A10:I10","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[6,7]},"sourceEndpoints":{"start":{"column":"503","level":108.0,"offsetFlag":""},"end":{"column":"504","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-24.666667,17.5,-41.75],"end":[-3.0,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-011","tower":1,"section":"14WF84","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":11,"range":"A11:I11","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[7,8]},"sourceEndpoints":{"start":{"column":"504","level":108.0,"offsetFlag":""},"end":{"column":"505","level":"13.0417 ABOVE 108","offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-3.0,17.5,-41.75],"end":[3.0,30.5417,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-012","tower":1,"section":"14WF84","category":"core-tie","source":{"id":"roof-truss-xls","sheet":"brace location A","row":12,"range":"A12:I12","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[7,8]},"sourceEndpoints":{"start":{"column":"504","level":"13.0417 ABOVE 108","offsetFlag":""},"end":{"column":"505","level":"13.0417 ABOVE 108","offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-3.0,30.5417,-41.75],"end":[3.0,30.5417,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-013","tower":1,"section":"14WF84","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":13,"range":"A13:I13","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[7,8]},"sourceEndpoints":{"start":{"column":"505","level":"13.0417 ABOVE 108","offsetFlag":""},"end":{"column":"504","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[3.0,30.5417,-41.75],"end":[-3.0,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-014","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":14,"range":"A14:I14","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[8,9]},"sourceEndpoints":{"start":{"column":"506","level":108.0,"offsetFlag":""},"end":{"column":"505","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[24.75,17.5,-41.75],"end":[3.0,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-015","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":15,"range":"A15:I15","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[9,10]},"sourceEndpoints":{"start":{"column":"507","level":108.0,"offsetFlag":""},"end":{"column":"506","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[45.666667,17.5,-41.75],"end":[24.75,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-016","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":16,"range":"A16:I16","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[10,11]},"sourceEndpoints":{"start":{"column":"507","level":108.0,"offsetFlag":""},"end":{"column":"508","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":[],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[45.666667,17.5,-41.75],"end":[66.041667,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":[]},{"id":"wtc1-brace-017","tower":1,"section":"18x26 BOX 4-1A","category":"outrigger","source":{"id":"roof-truss-xls","sheet":"brace location A","row":17,"range":"A17:I17","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[11]},"sourceEndpoints":{"start":{"column":"PERIMETER","level":108.0,"offsetFlag":""},"end":{"column":"508","level":110.0,"offsetFlag":""}},"yieldStressKsi":null,"yieldStressBasis":"not specified in this schedule row","notes":["Box dimensions describe the outside envelope; wall thickness is not assigned.","Perimeter attachment uses the truss-frame grid and 6\u00bd in inset; plate and bolt workpoints are not modeled."],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","sectionDimensionsFt":{"depth":2.1666666666666665,"width":1.5},"sourceSectionOutsideDimensionsIn":[18,26],"sectionOrientation":"Roll orientation is illustrative; schedule supplies two outside dimensions only.","start":[103.041667,17.5,-41.75],"end":[66.041667,43.166667,-41.75],"modelable":true,"render":true,"geometryEvidence":["SA401\u2013SA404: perimeter-grid workpoint inset 6\u00bd in"]},{"id":"wtc1-brace-018","tower":1,"section":"14WF158","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":18,"range":"A18:I18","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[4,14]},"sourceEndpoints":{"start":{"column":"501","level":110.0,"offsetFlag":""},"end":{"column":"602","level":"ROOF","offsetFlag":""}},"yieldStressKsi":50.0,"yieldStressBasis":"explicit schedule cell","notes":["Roof support height follows the SA elevation profile; column tip/cap, roof slab thickness and local connection offsets are omitted."],"geometryPrecision":"Nominal floor-level centerlines; local connection eccentricities are not represented.","start":[-66.041667,43.166667,-41.75],"end":[-46.166667,55.5,-25.583333],"modelable":true,"render":true,"geometryEvidence":["SA401/SA402 nominal sloped roof support profile"]},{"id":"wtc1-brace-019","tower":1,"section":"12WF92","category":"core-brace","source":{"id":"roof-truss-xls","sheet":"brace location A","row":19,"range":"A19:I19","drawing":"SA401","frame":"LINE 501-508","coordinateRows":[4,5]},"sourceEndpoints":{"start":{"column":"501","level":110.0,"offsetFlag":""},"end":{"column":"502","level":"ROOF","offsetFlag":""}},"yieldStressKsi":50.0,"yieldStressBasis":"explicit schedule cell","notes":["Roof support height follows the SA elevation profile; 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