{"schemaVersion":1,"building":"Original7 World Trade Center","units":"feet","scope":"Lower78A three actual rolled pieces and MG23 cap; source-limited shaft reconstruction","coordinateSystem":{"x":"east","y":"up","z":"south","groundDrawingDatumFt":311.3333333333333},"planPoints":[{"id":"F1-78A","x":54.5625,"z":44.29166666666667,"drawingXFt":230.91666666666666,"drawingZFt":116.5,"sourceIds":["frankel-E1","shop-0043","shop-0177"],"status":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78"}],"nodes":[{"id":"lower78A:A43-bottom","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":305.0833333333333,"yFt":-6.25,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]},{"id":"lower78A:A43-top","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":338.0,"yFt":26.666666666666668,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]},{"id":"lower78A:A177-bottom","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":338.0,"yFt":26.666666666666668,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]},{"id":"lower78A:A177-top","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":366.25,"yFt":54.916666666666664,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]},{"id":"lower78A:B177-bottom","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":366.25,"yFt":54.916666666666664,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]},{"id":"lower78A:B177-top","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":380.1666666666667,"yFt":68.83333333333333,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]},{"id":"lower78A:B177-cap-bottom","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":380.1666666666667,"yFt":68.83333333333333,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]},{"id":"lower78A:B177-cap-top","pointId":"F1-78A","columnId":"78A","x":54.5625,"z":44.29166666666667,"datumElevationFt":380.25,"yFt":68.91666666666667,"layer":"lower","positionStatus":"E1 lower78A dimensioned control; shop0043/0177 continuous matched shaft, distinct upper78","verticalBasis":"individually transcribed original shop mill/cap plane","sourceIds":["frankel-E1","shop-0043","shop-0177"]}],"members":[{"id":"lower78A-A43","assembly":"lower78A-support","face":"lower78A-support","role":"interior","layer":"lower","kind":"column","columnId":"78A","startNode":"lower78A:A43-bottom","endNode":"lower78A:A43-top","fromColumn":"F1-78A","toColumn":"F1-78A","section":{"designation":"W14X730","family":"wide-flange","nominalDepthIn":14,"weightLbPerFt":730,"material":"ASTM A572 Grade50 (individual shop bill)","plateRectangles":[{"centerX":0,"centerZ":0,"width":3.07,"depth":12.579999999999998},{"centerX":0,"centerZ":-8.745,"width":17.9,"depth":4.91},{"centerX":0,"centerZ":8.745,"width":17.9,"depth":4.91}],"orientationStatus":"web-north-south/flanges-east-west; E1 east/west W30x116/W36x210 WEB connections and shop0043 sectionA-A"},"sourceIds":["shop-0043","frankel-E1","frankel-E117A"],"sourceCrops":["analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0043-datums.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0043-base.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0043-top-label-rotated.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0043-base-label-rotated.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0043-section-A-A.png"],"erectionMark":"A43","note":"Actual source milled piece. Connection angles, stiffeners, flange splice plates, bolt holes, welds and mill fillets remain unmodeled.","sourceRegion":"Original lower78A shop shaft below MG23, separate from upper Column78","geometryBasis":"E1 dimensioned plan and shop mill/cap elevations","profileStatus":"source original designation and published catalog plate dimensions"},{"id":"lower78A-A177","assembly":"lower78A-support","face":"lower78A-support","role":"interior","layer":"lower","kind":"column","columnId":"78A","startNode":"lower78A:A177-bottom","endNode":"lower78A:A177-top","fromColumn":"F1-78A","toColumn":"F1-78A","section":{"designation":"W14X730","family":"wide-flange","nominalDepthIn":14,"weightLbPerFt":730,"material":"ASTM A572 Grade50 (individual shop bill)","plateRectangles":[{"centerX":0,"centerZ":0,"width":3.07,"depth":12.579999999999998},{"centerX":0,"centerZ":-8.745,"width":17.9,"depth":4.91},{"centerX":0,"centerZ":8.745,"width":17.9,"depth":4.91}],"orientationStatus":"web-north-south/flanges-east-west; E1 east/west W30x116/W36x210 WEB connections and shop0043 sectionA-A"},"sourceIds":["shop-0177","frankel-E1","frankel-E117A"],"sourceCrops":["analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-third-datums.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-lower-match.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-A177-bill.png"],"erectionMark":"A177","note":"Actual source milled piece. Connection angles, stiffeners, flange splice plates, bolt holes, welds and mill fillets remain unmodeled.","sourceRegion":"Original lower78A shop shaft below MG23, separate from upper Column78","geometryBasis":"E1 dimensioned plan and shop mill/cap elevations","profileStatus":"source original designation and published catalog plate dimensions"},{"id":"lower78A-B177","assembly":"lower78A-support","face":"lower78A-support","role":"interior","layer":"lower","kind":"column","columnId":"78A","startNode":"lower78A:B177-bottom","endNode":"lower78A:B177-top","fromColumn":"F1-78A","toColumn":"F1-78A","section":{"designation":"W14X665","family":"wide-flange","nominalDepthIn":14,"weightLbPerFt":665,"material":"ASTM A572 Grade50 (individual shop bill)","plateRectangles":[{"centerX":0,"centerZ":0,"width":2.83,"depth":12.560000000000002},{"centerX":0,"centerZ":-8.540000000000001,"width":17.7,"depth":4.52},{"centerX":0,"centerZ":8.540000000000001,"width":17.7,"depth":4.52}],"orientationStatus":"web-north-south/flanges-east-west; E1 east/west W30x116/W36x210 WEB connections and shop0043 sectionA-A"},"sourceIds":["shop-0177","frankel-E1","frankel-E117A"],"sourceCrops":["analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-fourth-datums.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-fourth-cap.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-fourth-bill-full.png"],"erectionMark":"B177","note":"Actual source milled piece. Connection angles, stiffeners, flange splice plates, bolt holes, welds and mill fillets remain unmodeled.","sourceRegion":"Original lower78A shop shaft below MG23, separate from upper Column78","geometryBasis":"E1 dimensioned plan and shop mill/cap elevations","profileStatus":"source original designation and published catalog plate dimensions"},{"id":"lower78A-B177-pc","assembly":"lower78A-support","face":"lower78A-support","role":"interior","layer":"lower","kind":"plate","columnId":"78A","startNode":"lower78A:B177-cap-bottom","endNode":"lower78A:B177-cap-top","fromColumn":"F1-78A","toColumn":"F1-78A","section":{"designation":"B177 cap pc30x30x1","family":"plate","dimensionsIn":{"width":30,"depth":30},"plateRectangles":[{"centerX":0,"centerZ":0,"width":30,"depth":30}]},"sourceIds":["shop-0177"],"sourceCrops":["analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-fourth-cap.png","analysis/wtc7-blueprint-reconstruction/lower-78a-source-crops/shop0177-fourth-bill-full.png"],"erectionMark":"B177-pc","note":"Original30x30x1in cap. Shop0177 shows a separate1in shim above, reaching its MG23 bottom reference380ft4in. Shop0551 gives a conflicting MG23 outer top388ft3in and8ft2in outer depth; the interface is unresolved. Shim footprint, four bolt holes and local stiffeners remain unmodeled.","sourceRegion":"Original lower78A shop shaft below MG23, separate from upper Column78","geometryBasis":"E1 dimensioned plan and shop mill/cap elevations","profileStatus":"source original designation and published catalog plate dimensions"}],"sources":[{"id":"frankel-E1","path":"sources/wtc7/drawings/expanded-releases/12-009/NIST_WTC7_FOIA_12-009/NIST_WTC7_FOIA_12-009_WTC7_E_Sheets/E Sheets/7WTC - E1/E1.tif","sha256":"5309362a8267874f24328b7317c3228f0a008cbfcb6feb4a0d08c9ae8ced84e4","sheet":"E1","use":"Lower78A plan and auxiliary-column schedule"},{"id":"frankel-E117A","path":"sources/wtc7/drawings/expanded-releases/12-009/NIST_WTC7_FOIA_12-009/NIST_WTC7_FOIA_12-009_WTC7_E_Sheets/E Sheets/7WTC - E1/E117A.tif","sha256":"2184736397fb9695c06e93ed9d049f262bbdab2a198ab8d5010cc7f24c669b2c","sheet":"E117A","use":"Lower78A plan and auxiliary-column schedule"},{"id":"cantor-S17A","path":"sources/wtc7/drawings/expanded-releases/11-209/NIST_WTC7_FOIA_11-209/2011-09-23, WTC 7 Structural/S-17A.tif","sha256":"ab13ee2334e19e324121c76f9d569d34252990df930521e50aedd38e3db7b806","sheet":"S17A","use":"Independent78A lower section bands"},{"id":"shop-0043","path":"sources/wtc7/drawings/expanded-releases/12-009/NIST_WTC7_FOIA_12-009/NIST_WTC7_FOIA_12-009_WTC7_Details_1/Detail Sheets 1/0043.TIF","sha256":"fa80b242084e1a95de6e2e42d9132253cba2e379571780b97fcdef509badd285","sheet":"0043","use":"Actual lower78A mill/cap planes"},{"id":"shop-0177","path":"sources/wtc7/drawings/expanded-releases/12-009/NIST_WTC7_FOIA_12-009/NIST_WTC7_FOIA_12-009_WTC7_Details_1/Detail Sheets 1/0177.TIF","sha256":"373787ff06a0cfa3690ecf47b27cad86b55f724f1676e8ab1060df4838826cbb","sheet":"0177","use":"Actual lower78A mill/cap planes"},{"id":"shop-0272","path":"sources/wtc7/drawings/expanded-releases/12-009/NIST_WTC7_FOIA_12-009/NIST_WTC7_FOIA_12-009_WTC7_Details_1/Detail Sheets 1/0272.TIF","sha256":"09a68e683b143fe8de146cc04a6acb8c6944615c9e26f42f8bbc38a3216f84e4","sheet":"0272","use":"Distinct A272 hanger identity; not a column"},{"id":"shop-0551","path":"sources/wtc7/drawings/expanded-releases/12-009/NIST_WTC7_FOIA_12-009/NIST_WTC7_FOIA_12-009_WTC7_Details_1/Detail Sheets 1/0551.TIF","sha256":"affcd5c326c59f8cacd607887b947308a0dce0287945f6502df6381b2d796880","sheet":"0551","use":"MG23 interface elevation cross-check; conflicting sources retained"},{"id":"shop-1001","path":"sources/wtc7/drawings/expanded-releases/12-009/NIST_WTC7_FOIA_12-009/NIST_WTC7_FOIA_12-009_WTC7_Details_1/Detail Sheets 1/1001.TIF","sha256":"2911bbf789c9761791468da90ff55ccf174953f0ed16a37fd56b1692c8a8f426","sheet":"1001","use":"MG23 interface elevation cross-check; conflicting sources retained"}],"columnPieceAssignments":[{"mark":"A43","section":"W14X730","bottomDatumFt":305.0833333333333,"topDatumFt":338.0,"rolledLengthInRational":"395","sourceId":"shop-0043"},{"mark":"A177","section":"W14X730","bottomDatumFt":338.0,"topDatumFt":366.25,"rolledLengthInRational":"339","sourceId":"shop-0177"},{"mark":"B177","section":"W14X665","bottomDatumFt":366.25,"topDatumFt":380.1666666666667,"rolledLengthInRational":"167","sourceId":"shop-0177"}],"counts":{"members":4,"columns":3,"capPlates":1,"nodes":8},"unmodeledAssemblies":[{"id":"A43-baseplate-and-bearing","sourceId":"shop-0043","dimensionsIn":[34,34,1],"bottomDatumFt":305,"topDatumFt":305.0833333333333,"reason":"Original plate dimensions/elevation verified; plan placement of plate/bearing and attachments not fully transcribed. No foundation extension inferred."},{"id":"B177-MG23-shim","sourceId":"shop-0177","thicknessIn":1,"bottomDatumFt":380.25,"topDatumFt":380.3333333333333,"reason":"Explicit1in shim retained as shop0177 metadata; footprint and connection arrangement untranscribed. Shop0551 outer girder elevations disagree, so the interface is not certified closed."},{"id":"MG23-shop-datum-conflict","sourceIds":["shop-0177","shop-0551","shop-1001"],"shop0551OuterTopDatumFt":388.25,"shop0551OuterDepthIn":98,"shop0551DerivedOuterBottomDatumFt":380.0833333333333,"shop0177MG23BottomReferenceDatumFt":380.3333333333333,"shop1001MG23TopReferenceDatumFt":388.3333333333333,"reason":"0551 labels outer PAN top388ft3in and1inPAN+96in main girder+1inPAX;0177 uses MG23 TOS388ft4in minus96in above its explicit cap/shim.1001 independently uses389ft0in minus8in to the girder reference, then1in leveling shim and1in PA baseplate. Source revisions/interface remain unresolved; no source has been shifted to force closure or to duplicate/replace a plate."},{"id":"A272-hanger","sourceId":"shop-0272","components":[{"designation":"L6X6X3/4","count":4,"finishedLengthInRational":"1187/4"}],"reason":"Shop explicitly ONE HANGER A272, supported from MG32. Four angle arrangement, local bearing offsets and plan registration require a separate pass; not a column from grade."}],"limitations":["This support is lower78A, not upper78. It terminates beneath MG23 rather than continuing through the upper building.","Connection plates, shop angles, tees, stiffeners, bolt holes and welds are not completed by the shaft package.","A43 elevation chain resolves the easily misread base label as305ft0in:309ft3in minus4ft3in. One-inch plate plus32ft11in rolled cut reaches338ft0in.","B177 revised elevation cut is13ft11in. The adjacent8/4 in its bill are page/line identifiers, not an8ft4in member length.","MG23 interface elevations disagree between shop0551 and shops0177/1001. The lower78A shaft/cap retain their own shop planes; no girder-bearing closure is claimed.","A272 is a separate four-angle hanger; E6 and existing/by-others first-floor bearings remain unmodeled."]}