{"schemaVersion":1,"building":"Original7 World Trade Center","units":"feet","scope":"MG23/A551 three primary plates; exact section and plan extent, explicit provisional vertical registration","coordinateSystem":{"x":"east","y":"up","z":"south","groundDrawingDatumFt":311.3333333333333},"planPoints":[{"id":"MG23-primary-south-cut","x":54.5625,"z":45.51041666666667,"drawingXFt":230.91666666666666,"drawingZFt":117.71875,"status":"source0551 primary-plate fabricated extent registered to lower78A and upper77/78 control chain","sourceIds":["shop-0551","frankel-E7"]},{"id":"MG23-primary-north-cut","x":54.5625,"z":11.677083333333336,"drawingXFt":230.91666666666666,"drawingZFt":83.88541666666666,"status":"source0551 primary-plate fabricated extent registered to lower78A and upper77/78 control chain","sourceIds":["shop-0551","frankel-E7"]}],"nodes":[{"id":"MG23-primary-south-cut","pointId":"MG23-primary-south-cut","x":54.5625,"z":45.51041666666667,"datumElevationFt":384.3333333333333,"yFt":73.0,"level":"7","assembly":"MG23-transfer-girder","positionStatus":"PROVISIONAL VERTICAL REGISTRATION; native0551 conflicts by2in","verticalBasis":"E7 general steel388ft4in, shop0177 lower78A cap+specified shim reaches380ft4in, and shop1001 upper78 bearing reference388ft4in","verticalUncertaintyFt":0.16666666666666666,"alternateDatumElevationFt":384.1666666666667,"sourceIds":["frankel-E7","shop-0551","shop-0177","shop-1001"]},{"id":"MG23-primary-north-cut","pointId":"MG23-primary-north-cut","x":54.5625,"z":11.677083333333336,"datumElevationFt":384.3333333333333,"yFt":73.0,"level":"7","assembly":"MG23-transfer-girder","positionStatus":"PROVISIONAL VERTICAL REGISTRATION; native0551 conflicts by2in","verticalBasis":"E7 general steel388ft4in, shop0177 lower78A cap+specified shim reaches380ft4in, and shop1001 upper78 bearing reference388ft4in","verticalUncertaintyFt":0.16666666666666666,"alternateDatumElevationFt":384.1666666666667,"sourceIds":["frankel-E7","shop-0551","shop-0177","shop-1001"]}],"members":[{"id":"MG23-A551-primary","assembly":"MG23-transfer-girder","face":"MG23-transfer-girder","role":"interior","layer":"lower","kind":"beam","erectionMark":"A551","designMark":"MG23","startNode":"MG23-primary-south-cut","endNode":"MG23-primary-north-cut","fromColumn":"78A","toColumn":"77","section":{"designation":"MG23/A551: WEB86x4 + FLANGES30x5","family":"built-up-I","dimensionsIn":{"depth":96,"width":30,"webThickness":4,"flangeThickness":5},"material":"ASTM A572 Grade42 (individual0551 primary plate bill)","status":"original-readable-primary-plate-dimensions; vertical registration remains provisional"},"sourceIds":["frankel-E7","shop-0551","shop-0177","shop-1001"],"sourceRegion":"E7 MG23/A551 between lower78A and truss2/77, supporting upper78; native shop0551 primary plates","geometryBasis":"Exact source plan/cut lengths and plate gauges; PROVISIONAL primary TOS388ft4in from E7 and adjoining support chains","geometryStatus":"provisional-vertical-registration; native-shop-datum-conflict","profileStatus":"original three primary plates;96in depth; top/web406in and bottom394in lengths","topOfSteelDatumFt":388.3333333333333,"verticalUncertaintyFt":0.16666666666666666,"datumConflict":{"id":"MG23-shop-datum-conflict","status":"unresolved-native-source-conflict","sourceIds":["frankel-E7","shop-0551","shop-0177","shop-1001"],"chosenRegistration":{"status":"PROVISIONAL; source combination, not a resolved as-built datum","primaryTopDatumFt":388.3333333333333,"primaryBottomDatumFt":380.3333333333333,"basis":"E7 general steel388ft4in, shop0177 lower78A cap+specified shim reaches380ft4in, and shop1001 upper78 bearing reference388ft4in"},"alternate0551Registration":{"outerPanTopDatumFt":388.25,"primaryTopDatumFt":388.1666666666667,"primaryBottomDatumFt":380.1666666666667,"outerPaxBottomDatumFt":380.0833333333333,"basis":"Native0551 explicitly labels outerPAN topEL388ft3in;1inPAN,96inprimary depth and1inPAX yield98in maintained overall depth"},"primaryDatumDifferenceIn":2,"verticalUncertaintyFt":0.16666666666666666,"reason":"The girder shop elevation conflicts with E7 and independently recovered adjoining column bearing chains. No explicit revision resolves the difference; primary body is displayed provisionally with both registrations retained.","revisionReview":[{"sourceId":"shop-0551","made":"March1985","revisions":["1985-05-07","1985-05-22"],"note":"Revision2 callout concerns derrick guy/lifting connections; no explicit vertical datum revision identified."},{"sourceId":"shop-0177","made":"March1985","revisions":["1985-04-11"],"note":"Revised B17713ft11in cut and cap/shim chain retained."},{"sourceId":"shop-1001","made":"March1985","revisions":["1985-04-18","1985-04-25","1985-05-07"],"note":"Revision3 adds pd; bottom bearing chain remains separately dimensioned."}]},"sourceConflict":{"id":"MG23-shop-datum-conflict","status":"unresolved-native-source-conflict","sourceIds":["frankel-E7","shop-0551","shop-0177","shop-1001"],"chosenRegistration":{"status":"PROVISIONAL; source combination, not a resolved as-built datum","primaryTopDatumFt":388.3333333333333,"primaryBottomDatumFt":380.3333333333333,"basis":"E7 general steel388ft4in, shop0177 lower78A cap+specified shim reaches380ft4in, and shop1001 upper78 bearing reference388ft4in"},"alternate0551Registration":{"outerPanTopDatumFt":388.25,"primaryTopDatumFt":388.1666666666667,"primaryBottomDatumFt":380.1666666666667,"outerPaxBottomDatumFt":380.0833333333333,"basis":"Native0551 explicitly labels outerPAN topEL388ft3in;1inPAN,96inprimary depth and1inPAX yield98in maintained overall depth"},"primaryDatumDifferenceIn":2,"verticalUncertaintyFt":0.16666666666666666,"reason":"The girder shop elevation conflicts with E7 and independently recovered adjoining column bearing chains. No explicit revision resolves the difference; primary body is displayed provisionally with both registrations retained.","revisionReview":[{"sourceId":"shop-0551","made":"March1985","revisions":["1985-05-07","1985-05-22"],"note":"Revision2 callout concerns derrick guy/lifting connections; no explicit vertical datum revision identified."},{"sourceId":"shop-0177","made":"March1985","revisions":["1985-04-11"],"note":"Revised B17713ft11in cut and cap/shim chain retained."},{"sourceId":"shop-1001","made":"March1985","revisions":["1985-04-18","1985-04-25","1985-05-07"],"note":"Revision3 adds pd; bottom bearing chain remains separately dimensioned."}]},"note":"Provisional vertical registration; shop0551 places primary top2in lower. Primary body is displayed at E7/column-supported TOS388ft4in; native0551 implies primaryTOS388ft2in. Exact primary plate dimensions/unequal lengths are rendered; bearing plates and support hardware remain omitted pending their relation to the column shims.","plateParts":[{"name":"PA top flange","center":[0,16.916666666666668,45.5],"size":[30,33.833333333333336,5],"sourcePlate":"PA"},{"name":"PC web","center":[0,16.916666666666668,0],"size":[4,33.833333333333336,86],"sourcePlate":"PC"},{"name":"PB bottom flange","center":[0,16.416666666666668,-45.5],"size":[30,32.833333333333336,5],"sourcePlate":"PB"}],"unmodeledComponents":["UNRESOLVED2in primary vertical datum conflict:0551 versus E7/0177/1001; displayed registration is provisional","PAX30x31x1in lower bearing plate and PAN22x26x1in upper bearing plate; identity/overlap with specified support shims unresolved","Bearing stiffeners, column connection pk/aa parts, plate edge preparation, bolt holes, lifting/guy plates and welds"],"spanCrossCheck":{"sourceSupportSpanIn":406.125,"registeredSupportSpanIn":406.11360718870355,"differenceIn":-0.01139281129644587,"source78Ato78In":129,"primaryPlateLengthIn":406,"bottomFlangeLengthIn":394,"northFlangeSetbackIn":12}}],"sources":[{"id":"frankel-E7","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/E7.tif","sha256":"9b5515b9ca26e780a353838097af05be46a744958b116747b6424882f75252a9"},{"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"},{"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"},{"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"}],"datumConflicts":[{"id":"MG23-shop-datum-conflict","status":"unresolved-native-source-conflict","sourceIds":["frankel-E7","shop-0551","shop-0177","shop-1001"],"chosenRegistration":{"status":"PROVISIONAL; source combination, not a resolved as-built datum","primaryTopDatumFt":388.3333333333333,"primaryBottomDatumFt":380.3333333333333,"basis":"E7 general steel388ft4in, shop0177 lower78A cap+specified shim reaches380ft4in, and shop1001 upper78 bearing reference388ft4in"},"alternate0551Registration":{"outerPanTopDatumFt":388.25,"primaryTopDatumFt":388.1666666666667,"primaryBottomDatumFt":380.1666666666667,"outerPaxBottomDatumFt":380.0833333333333,"basis":"Native0551 explicitly labels outerPAN topEL388ft3in;1inPAN,96inprimary depth and1inPAX yield98in maintained overall depth"},"primaryDatumDifferenceIn":2,"verticalUncertaintyFt":0.16666666666666666,"reason":"The girder shop elevation conflicts with E7 and independently recovered adjoining column bearing chains. No explicit revision resolves the difference; primary body is displayed provisionally with both registrations retained.","revisionReview":[{"sourceId":"shop-0551","made":"March1985","revisions":["1985-05-07","1985-05-22"],"note":"Revision2 callout concerns derrick guy/lifting connections; no explicit vertical datum revision identified."},{"sourceId":"shop-0177","made":"March1985","revisions":["1985-04-11"],"note":"Revised B17713ft11in cut and cap/shim chain retained."},{"sourceId":"shop-1001","made":"March1985","revisions":["1985-04-18","1985-04-25","1985-05-07"],"note":"Revision3 adds pd; bottom bearing chain remains separately dimensioned."}]}],"unmodeledAssemblies":[{"id":"MG23-shop-datum-conflict","status":"unresolved-native-source-conflict","sourceIds":["frankel-E7","shop-0551","shop-0177","shop-1001"],"chosenRegistration":{"status":"PROVISIONAL; source combination, not a resolved as-built datum","primaryTopDatumFt":388.3333333333333,"primaryBottomDatumFt":380.3333333333333,"basis":"E7 general steel388ft4in, shop0177 lower78A cap+specified shim reaches380ft4in, and shop1001 upper78 bearing reference388ft4in"},"alternate0551Registration":{"outerPanTopDatumFt":388.25,"primaryTopDatumFt":388.1666666666667,"primaryBottomDatumFt":380.1666666666667,"outerPaxBottomDatumFt":380.0833333333333,"basis":"Native0551 explicitly labels outerPAN topEL388ft3in;1inPAN,96inprimary depth and1inPAX yield98in maintained overall depth"},"primaryDatumDifferenceIn":2,"verticalUncertaintyFt":0.16666666666666666,"reason":"The girder shop elevation conflicts with E7 and independently recovered adjoining column bearing chains. No explicit revision resolves the difference; primary body is displayed provisionally with both registrations retained.","revisionReview":[{"sourceId":"shop-0551","made":"March1985","revisions":["1985-05-07","1985-05-22"],"note":"Revision2 callout concerns derrick guy/lifting connections; no explicit vertical datum revision identified."},{"sourceId":"shop-0177","made":"March1985","revisions":["1985-04-11"],"note":"Revised B17713ft11in cut and cap/shim chain retained."},{"sourceId":"shop-1001","made":"March1985","revisions":["1985-04-18","1985-04-25","1985-05-07"],"note":"Revision3 adds pd; bottom bearing chain remains separately dimensioned."}]},{"id":"MG23-bearing-plates","sourceIds":["shop-0551","shop-0177","shop-1001"],"sourcePlates":[{"mark":"PAX","widthIn":30,"lengthIn":31,"thicknessIn":1},{"mark":"PAN","widthIn":22,"lengthIn":26,"thicknessIn":1}],"reason":"Do not identify these plates as the column sheets specified shims or add duplicate bearing thickness without resolving the source datum/connection relationship."}],"counts":{"members":1,"nodes":2,"primaryPlateParts":3},"limitations":["MG23 is not registered to a fully reconciled as-built vertical datum;2in primary elevation disagreement remains explicit.","Known primary plate dimensions do not establish complete bearing, stiffness, connection or fabrication geometry.","Primary raw/cut plate lengths differ from support-centre span; shortened north bottom flange is retained.","No continuity claim is made for the unresolved PAX/PAN plates, shims or northern truss/77 connection."]}