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Any taper or edge pinning is a display boundary assumption.","impactGeometry":"Keep existing modeled holes and damaged members. These source plots do not establish an incremental displacement field relative to native impact-deformed geometry.","disconnections":"No whole-edge free support boundary follows from Di figures. Horizontal connection failure is distinct from loss of vertical bearing; see dataset supportEvidence."}},{"id":"WTC2-F81-Di-40min-east-slab","tower":2,"floor":81,"case":"Di","minutesAfterImpactModel":40,"source":{"report":"NIST NCSTAR 1-6D","url":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-6dv2.pdf","figure":"5-9","panel":"d","printedPage":323,"pdfPage1Based":387,"panelType":"slab-inclusive full-floor isometric displacement contour","sourceImage":"assets/WTC2-F81-Di-40min-source.png","figureCrop":"assets/NCSTAR1-6D_fig5-9_p323.png","registrationWitness":"assets/WTC2-F81-Di-40min-samples.png"},"wholeModelUZExtremaIn":[-96.222,3.078],"legendUZBoundariesIn":[-96.222,-85.189,-74.156,-63.122,-52.089,-41.055,-30.022,-18.989,-7.955,3.078],"reportedWholeModelMaximumDownIn":96.222,"physicalTrussMaximumDownIn":null,"trussMaximumStatus":"Not determined from this slab-inclusive plot. The maximum includes the full floor and core; it is not an amplitude target for the sampled office field.","coordinateFrame":{"x":"east positive feet","z":"south positive feet","downIn":"down positive inches"},"registration":{"method":"Approximate orthographic-isometric inverse projection. Pixel u=cx-a*x+a*z; pixel v=cy-b*x-b*z+(downIn/12)*2*b*5. Subtract the signed band midpoint's projected vertical displacement before solving for plan coordinates. Horizontal deformation is not undone.","imageSizePixels":[584,376],"planeCornerPixels":{"leftNE":[2,188],"topSE":[294,19],"rightSW":[581,188],"bottomNW":[291,357]},"projectionCenterPixels":[291.5,188.0],"xPlanPxPerFt":1.3974255832662914,"diagonalYPxPerFt":0.8157683024939663,"verticalPxPerFt":1.6315366049879325,"displacementMagnification":5,"magnificationEvidence":"Exact Floor80 image is repeated in Appendix FigA-41, whose caption specifies5x. Same camera and5x for the other Fig5-9 panels is an inference corroborated by Appendix A-40/A-42/A-43/A-44 plots of the same floors at other times.","approximatePlanUncertaintyFt":10,"domain":"east office only: x43.5..103.5833ft and z-67.5..67.5ft, excluding nominal core. No full-floor or core field recovered.","nominalCoreBoundsFt":{"x":[-43.5,43.5],"z":[-67.5,67.5]},"caution":"Contour-band scalar estimates at approximately registered visible surface locations; no original solver node coordinates are recovered.5x shown displacements are undone only for approximate plan registration, not applied to physical amplitudes."},"colorPaletteRGB":[[0,0,255],[0,179,255],[0,255,255],[0,255,179],[1,255,0],[179,255,0],[255,255,0],[255,179,0],[255,0,0]],"paletteInterpretation":"Shade-normalized hue within3/255; intensity70..249 and7/9 matching neighboring hues reject isolated reference pins/mesh lines. 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The maximum includes the full floor and core; it is not an amplitude target for the sampled office field.","coordinateFrame":{"x":"east positive feet","z":"south positive feet","downIn":"down positive inches"},"registration":{"method":"Approximate orthographic-isometric inverse projection. Pixel u=cx-a*x+a*z; pixel v=cy-b*x-b*z+(downIn/12)*2*b*5. Subtract the signed band midpoint's projected vertical displacement before solving for plan coordinates. Horizontal deformation is not undone.","imageSizePixels":[585,378],"planeCornerPixels":{"leftNE":[2,188],"topSE":[293,20],"rightSW":[582,188],"bottomNW":[291,357]},"projectionCenterPixels":[292.0,188.0],"xPlanPxPerFt":1.3998390989541432,"diagonalYPxPerFt":0.8133547868061143,"verticalPxPerFt":1.6267095736122286,"displacementMagnification":5,"magnificationEvidence":"Exact Floor80 image is repeated in Appendix FigA-41, whose caption specifies5x. Same camera and5x for the other Fig5-9 panels is an inference corroborated by Appendix A-40/A-42/A-43/A-44 plots of the same floors at other times.","approximatePlanUncertaintyFt":10,"domain":"east office only: x43.5..103.5833ft and z-67.5..67.5ft, excluding nominal core. No full-floor or core field recovered.","nominalCoreBoundsFt":{"x":[-43.5,43.5],"z":[-67.5,67.5]},"caution":"Contour-band scalar estimates at approximately registered visible surface locations; no original solver node coordinates are recovered.5x shown displacements are undone only for approximate plan registration, not applied to physical amplitudes."},"colorPaletteRGB":[[0,0,255],[0,179,255],[0,255,255],[0,255,179],[1,255,0],[179,255,0],[255,255,0],[255,179,0],[255,0,0]],"paletteInterpretation":"Shade-normalized hue within3/255; intensity70..249 and7/9 matching neighboring hues reject isolated reference pins/mesh lines. 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isometric contour-band midpoint","sampleRole":"visible lowest office-domain band"},{"xFt":64.1,"zFt":26.2,"downIn":33.162,"downIntervalIn":[31.027,35.296],"sourcePixel":[239,137],"sourceRGB":[0,0,189],"colorBand":0,"kind":"slab-inclusive isometric contour-band midpoint","sampleRole":"visible lowest office-domain band"},{"xFt":59.1,"zFt":14.1,"downIn":33.162,"downIntervalIn":[31.027,35.296],"sourcePixel":[229,151],"sourceRGB":[0,0,142],"colorBand":0,"kind":"slab-inclusive isometric contour-band midpoint","sampleRole":"visible lowest office-domain band"}],"unfilledTargetPlanFt":[[48,0]],"reviewWitness":"/Users/theair/wtc-explainer/analysis/south-initiation/floors/WTC2-F83-Di-40min-samples.png","sampledMaximumDownIn":33.162,"sampledMaximumUpIn":0,"supportHandling":{"slabToTruss":"A common field on existing slabs and trusses is a visualization assumption, not separately reconstructed member-node displacements.","coreAndPerimeterHeight":"No prescribed zero boundary amplitudes are supplied by this data. Any taper or edge pinning is a display boundary assumption.","impactGeometry":"Keep existing modeled holes and damaged members. These source plots do not establish an incremental displacement field relative to native impact-deformed geometry.","disconnections":"No whole-edge free support boundary follows from Di figures. Horizontal connection failure is distinct from loss of vertical bearing; see dataset supportEvidence."}}],"useLimits":["All five plots share one40min calculation state; they are not interior photographic observations or a timed collapse trajectory.","Di full-floor subsystem response is not the final global CaseD solution. Preserve that case distinction.","No scaling to per-floor or whole-building maxima. Reported extrema may be outside this visible office domain.","Combining floor shapes, exterior-wall observation, and upper tilt requires reconstructed transitions. The display targets one total slab-contour displacement, accounting for the separately reconstructed impact drop already present in retained members. This is approximate common-reference registration, not a recovered NIST mesh or timed trajectory.","Apply field only to existing surviving geometry. Never fill missing damage or replace custom panels."],"supportEvidence":{"source":"NCSTAR1-6D AppendixA pp331\u2013333,361\u2013362; \u00a72.5 pp36\u201338; Chapter5 pp320\u2013321.","impact":"Floor80 and81 lost many east-side interior/core seats in the impact model. Chapter5 estimates about one-quarter to one-half of east core seats severed there, and over one-third of east-wall seats on83.","subsystemHorizontal":"At later Di temperatures, gusset plates/seat bolts at more than75percent of east-face exterior seats on82 and83 fail in horizontal shear. This does not mean all those trusses lost vertical bearing.","subsystemVertical":"AppendixA Di account identifies only Floor81 truss at exterior column357 as losing its exterior vertical support among these floor models, by walking off its seat.","observedGlobal":"NIST added visually observed floor/wall disconnections to the global models at specified locations/times when not predicted by isolated floors. Do not transfer one subsystem support map to the global/observed reconstruction.","modelLimits":"One floor plus one-story column stubs above/below; columns fixed vertically at bottom, exterior far ends fixed perpendicular to face. Steel creep omitted. Several connection/deck/bridging components omitted, with bridging restored on80/81 to carry impact-damaged east floors. Thermal shapes follow dead/live loading and severed-member removal."},"additionalPeakTimeTable":{"source":"AppendixA TableA-4 p362, FigsA-40\u201344 pp362\u2013364","rows":[{"floor":79,"maximumDownIn":35.8,"modelMinutes":60},{"floor":80,"maximumDownIn":65.6,"modelMinutes":40},{"floor":81,"maximumDownIn":96.7,"modelMinutes":50},{"floor":82,"maximumDownIn":49.4,"modelMinutes":60},{"floor":83,"maximumDownIn":44.6,"modelMinutes":60}],"usage":"Separate peak-time comparison only; do not combine as a simultaneous calculation state."},"tower":2,"title":"South Tower: calculated sagging, observed bowing, reconstructed first movement","wall":{"source":{"report":"NIST NCSTAR1-3 final","figure":"6-18","printedPage":66,"fullPdfPage":114,"url":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-3.pdf","localPdf":"sources/NCSTAR1-3_final.pdf","date":"2001-09-11","times":["09:52:54 EDT","09:53:04 EDT"],"measurementAnchor":"Upper-left corner of window containing numeral, with row taken from printed 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visible zeros in the partial row above the labeled floor83 row. The partial row has no printed floor number. Kept out of numeric control points rather than silently assigning a floor.","columnsAndInches":[[318,0],[324,0],[327,0],[330,0],[331,0],[332,0],[333,0]]},"sourceNotes":{"schemaVersion":1,"tower":"WTC2","face":"east","direction":"inward","units":"inches","primarySource":{"report":"NCSTAR 1-3","section":"6.2.7","figure":"6-18","printedPage":66,"fullPdfPage":114,"url":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-3.pdf","timeRangeLocal":["09:52:54","09:53:04"],"timeZone":"EDT","date":"2001-09-11","measurementLocation":"Upper left corner of the window containing the printed numeral. Map row uses the NIST floor label. Rendering uses the nominal structural opening top 38.5in below the next slab; the exact architectural window-frame offset remains unresolved.","uncertaintyInches":{"printedMap":1,"sectionTextRange":[1,2]},"combination":"NIST combined two photos by same photographer, similar location, 10 seconds apart, assuming no appreciable bow change.","missing":"Empty regions have no data, including smoke, damaged aluminum, lack of a true-vertical reference. Much of the southern end is blocked by another building; blank is not zero."},"selectedObservedControls":{"transcription":"Manually read from full figure; selected cross profiles only, not the full measured grid.","peak":{"floor":80,"column":321,"inches":20},"lateralAtFloor80":[{"column":302,"inches":0},{"column":303,"inches":0},{"column":304,"inches":0},{"column":305,"inches":5},{"column":309,"inches":12},{"column":312,"inches":13},{"column":313,"inches":14},{"column":314,"inches":13},{"column":315,"inches":17},{"column":318,"inches":13},{"column":319,"inches":14},{"column":321,"inches":20},{"column":322,"inches":13},{"column":323,"inches":16},{"column":324,"inches":16},{"column":325,"inches":17},{"column":326,"inches":14},{"column":327,"inches":13},{"column":328,"inches":10},{"column":329,"inches":13},{"column":333,"inches":14},{"column":336,"inches":12}],"verticalAtColumn321":[{"floor":77,"inches":4},{"floor":78,"inches":12},{"floor":79,"inches":16},{"floor":80,"inches":20},{"floor":81,"inches":17},{"floor":82,"inches":9}],"unknownAtColumn321":[83,84]},"displayReconstruction":{"status":"Assumed interpolation, not NIST full wall solution.","method":"May multiply piecewise-linear selected F80 lateral profile and C321 vertical profile, divided by 20. This respects only those two cross profiles. Other source grid points generally will not be reproduced; do not describe the product as the measured full surface.","proposedUnobservedTapers":{"verticalFloors":[75,85],"verticalInches":[0,0],"faceEndColumns":[301,359],"faceEndInches":[0,0]},"taperCaution":"Zeros at the model boundaries are chosen display conditions. No photo establishes zero bow over the concealed region or the complete top and bottom boundaries.","observedProfileLowerLimit":"At F77/C321 source is 4 inches, not zero.","integrationUpdate":"The implemented field supersedes the preliminary two-cross-profile proposal: all176 labeled-row measurements are retained. See wall.displayMethod and wall.measuredPoints."},"otherSourceDescriptions":[{"report":"NCSTAR 1-6D final","location":"Table 5-5, printed p319, full PDF p383","observations":[{"time":"09:21","floors":[78,83],"peakFloor":80,"rangeInches":[7,9]},{"time":"09:54","floors":[78,84],"peakFloor":80,"rangeInches":[12,20]}],"note":"Rounded summary time differs from exact 1-3 photo timestamps.","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101366"},{"report":"NCSTAR 1-6D final","location":"printed pp52-53, full PDF pp116-117","description":"At 9:53, describes bow C301-353 between F77-84 and about 15-20 inches at F81 between C320-330. This is the global-model input discussion, not an exact restatement of the 1-3 map.","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101366"},{"report":"NCSTAR 1-6D final","location":"printed p246, full PDF p310; Figs4-100/4-101 and5-13","calculatedCase":"D","modelMinutesAfterImpact":43,"computedPeakInches":62,"note":"Computed instability magnitude, not measured 20-inch photographic maximum; calculation clock is not a verified event timeline.","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101366"}],"onset":{"primarySource":{"report":"NCSTAR 1 final","section":"6.14.7","printedPage":152,"fullPdfPage":202,"url":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1.pdf"},"eastTiltDegrees":[7,8],"southTiltDegrees":[3,4],"timing":"Prior to significant downward movement of the upper building section.","apparentRotationRegion":"Near floor 82; final6D Table5-5 says around base of floor82.","pivotCaution":"No unique measured 3D pivot or individual floor trajectory supplied.","displayTarget":{"totalTiltDegrees":2,"eastSouthRatio":[7.5,3.5],"horizontalUnitEast":0.9061831399952655,"horizontalUnitSouth":0.42288546533112387,"status":"Provisional direction chosen from midpoints of reported later angular ranges. It is not a measured first-2-degree trajectory or timestamp.","note":"A single axis-angle rotation can ensure total tilt exactly2 degrees. Applying2 degrees independently about both horizontal axes would exceed the requested total."}},"connections":{"observedExterior":{"report":"NCSTAR 1-6D final, Table5-5 p319 and Fig5-10 p324","floor":83,"drapedBetweenColumns":[310,342],"note":"Observed hanging/draped objects support edge separation; they do not identify every internal truss seat or supply a time-resolved 3D floor path."},"modelExteriorAt50Min":{"report":"NCSTAR 1-6D final pp52-53","eastWallDisconnectDomains":[{"floor":83,"columnsInclusive":[302,357]},{"floor":82,"columnsInclusive":[301,349]}],"remainingPullIn":"At50 min, model applied pull-in across eastwall F78-81 and C350-359 on F82.","classification":"Final global CaseD input adjusted from floor analyses, reevaluated connection capacities, and photo/video evidence. Not all individual failures directly observed."},"modelCoreImpact":{"report":"NCSTAR 1-6D final p320","floors":[80,81],"description":"About one-quarter to one-half of east-side core floor truss seat connections severed in impact assessment; more sag on these floors.","individualSeatIds":"Not specified in this summary; do not invent exact IDs from the fraction."}},"assets":[{"file":"NCSTAR1-3_fig6-18_WTC2_east_bow_observed.png","report":"NCSTAR 1-3","figure":"6-18","printedPage":66,"fullPdfPage":114,"classification":"Photographic measurement map","copyright":"NIST figure; caption and uncertainty legend retained.","render":"Whole figure and full caption, rotated upright.","url":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-3.pdf"},{"file":"NCSTAR1-6D_fig5-10_WTC2_observed_floor_sagging.png","report":"NCSTAR 1-6D final","figure":"5-10","printedPage":324,"fullPdfPage":388,"classification":"Observed imagery montage","copyright":"Photographs \u00a92001 Mark Stetler; embedded credit retained. Not government public-domain photographs.","sourceTimeDiscrepancy":"Panel(d) caption says9:54, while embedded image clock says9:55:04. Preserve both; do not relabel the image an exact9:54 frame.","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101366"},{"file":"NCSTAR1-6D_fig5-16_WTC2_observed_initiation.png","report":"NCSTAR 1-6D final","figure":"5-16","printedPage":328,"fullPdfPage":392,"classification":"Observed onset photograph","copyright":"\u00a92001 WNBC embedded credit retained. Not government public-domain photo.","caption":"Initiation of Collapse of WTC2. Note the tilt toward east and south.","render":"Photo and entire caption; adjacent20x-magnified calculated Fig5-15 excluded.","url":"https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101366"}]},"displayMethod":"Retain all 176 transcribed labeled-row controls at their columns and nominal upper window-corner heights: floorY(row+1) minus38.5/12ft, from the52in spandrel centered12.5in below the next slab. The exact architectural frame offset remains unresolved. Fill unknown cells by inverse-distance-fourth-power weighting in wall feet, then bilinear interpolation on the window-row/column table.","chosenBoundaryConditions":{"zeroFloors":[75,85],"zeroColumns":[299,361],"status":"Display tails outside the measured region, not inferred zeros in blank cells."},"observedMaximumIn":20,"computedGlobalCaseDMaximumIn":62},"onset":{"displayStopDegrees":2,"displayEastSouthRatio":[7.5,3.5],"observedEastTiltDegrees":[7,8],"observedSouthTiltDegrees":[3,4],"nominalPivotFloor":82,"displayTransitionFloors":[81,82],"settlement":"No independent downward translation is imposed. The nominal floor82 center is held while the upper structure rotates. This is an orientation registration, not a measured pivot or proof of zero descent; the opposite edge may rise.","scope":"Only a chosen first2degrees of combined upper-section orientation near floor82 are shown. Recorded floor members at floor81 and below hold their sagged and bowed state, a display truncation rather than evidence that those floors remained motionless. Direction, pivot, local joining deformation and playback remain reconstructed; NIST did not supply this first2degree trajectory.","lowerTransition":"Recorded floor members below82 have zero added onset transform; recorded floors82 and above share one full upper rigid transform. Only vertical and unassigned context geometry blends from floor81+0.5ft to floor82\u22123.5ft. This8ft visual join uses an approximately linear displacement blend with0.5ft rounded ends to avoid concentrating artificial shortening. It is not a measured hinge, buckling wavelength or contact solution. No floor75\u201381 tilt ramp remains.","joinRegistration":{"lowerReferenceFloor":81,"lowerOffsetFt":0.5,"upperReferenceFloor":82,"upperOffsetFt":-3.5,"roundingFt":0.5,"status":"Chosen local visual join near the apparent upper-section base; not measured geometry."}},"displayCoupling":{"vertical":"The five signed east-office slab-contour fields guide retained office slabs and trusses toward one total displacement. Applied movement equals total contour drop minus the representative impact drop already encoded in each member, excluding its nominal section depth. Regular members use the selected impact field with inverse plan registration; custom retained runs use their source polylines. Core framing and building-side supports receive no office-floor sag. Common member motion and registration are visualization assumptions. Local upward adjustments join separate reconstructed states and do not establish physical recovery. No zero amplitude is imposed on sampled office edges. A chosen six-foot taper outside the domain joins context.","horizontal":"A common east-office horizontal field follows the interpolated east-wall bow. This is display compatibility, not a force calculation or a solved attachment map. No per-seat releases or further fractures are invented.","connections":"Horizontal gusset/bolt failures must not be interpreted as universal loss of vertical bearing. D\u1d62 subsystem, final global model inputs and observed hanging floor edges are distinct records.","floorIdentity":"Recorded members and instances use their own floor number for sag, horizontal compatibility and tilt weight, including F81 trusses already bent more than6ft below their nominal floor. Unrecorded context pieces retain the geometric-height fallback. Auxiliary instance floor data do not alter position, normal, index, source transform or member-record buffers."},"playback":{"seconds":22,"status":"Educational progress, not elapsed event time","phases":["impact context","Di40 floor shapes","observed east bow","reconstructed initial tilt","stop at2 degrees"]}}