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It is not a final CaseB global-model solved floor surface.","southExteriorSeatLoss":{"columnRangeInclusive":[329,343],"source":"Fig5-5 p316; 1-6C p127 and Fig5-89 p132","onsetModelMinutesApprox":[80,90],"status":"Bi subsystem disconnection evidence; final CaseB global connection maps are separate"},"supportDomainMask":{"planBoundsFt":[-67.5,43.5,67.5,103.5833333333],"sampledPlanBoundsFt":[-65,45,65,101],"coreBoundarySouthZFt":43.5,"southExteriorZFt":103.5833333333,"coreAndOtherSides":"outside this source field; retain separate context or an explicitly reconstructed transition","southBoundaryPolicy":"Do not force the entire boundary to original height. Preserve the source-specific support-loss zone and use a separately reconstructed attachment field where connected.","impactVoids":"No new removal polygon inferred from sag colors. Use matching impact/reference geometry and do not bridge any existing void with this field.","subsystemSouthSupportLoss":{"columnRangeInclusive":[329,343],"xEastRangeFt":[-43.333,3.333],"zSouthFt":103.5833333333,"action":"Do not clamp to zero vertical motion or attach the floor to the wall across these source disconnected seats.","note":"Bi subsystem range fromFig5-5; final CaseB global maps can expand the disconnection range and must be treated separately."}}}],"usage":{"sameTime":"Four floors all at100 model minutes. No earlier time histories inferred.","recommendedUse":"Use each floor-specific south-office field for an explicitly reconstructed sag illustration. If detailed trusses share the slab field, identify this as compatible display geometry, not their independently solved deformation.","doNot":"Do not use the whole-model maximum as a precise truss amplitude, normalize other floors to it, call these final Case B floor shapes, or present their addition to unrelated impact deformation as a NIST result.","floor99":"Reference context. Final global95-99 pull-in does not provide quantitative Floor99 south sag.","support":"Source shapes include moving supports and local seat losses. A zero-height clamp along the whole south perimeter would erase the F97/F98 source behavior.","wallCoupling":"Final CaseB south-wall profile and pull-in locations must be sourced independently; shared endpoint motion and attachment deformation are reconstructed."},"sourceContext":{"finalNarrative":"NCSTAR1-6D p314 describes long-span truss sag on floors95-99, north first then south, and presentsFig5-4 as subsystem evidence.","globalModel":"NCSTAR1-6D pp36-40 explains that global model did not solve the detailed floor sag. Pull-in/disconnections were imposed using subsystem studies and observations.","globalPullIn":{"tower":1,"case":"B","floors":[95,96,97,98,99],"face":"south","startModelMinute":80,"publishedForceKipPerColumn":5,"extent":"entire wall width except disconnected locations","source":"NCSTAR1-6D p40, Figs2-36/37 pp49/50; local actual disconnection topology must come from those maps."},"wallResponse":"NCSTAR1-6D p181:5kip result reaches about43in at100min, but that run did not reach instability; observed bow about55in at97min is a separate evidential endpoint.","initialMovement":"NCSTAR1-6D p314 describes south-wall buckling, upper-section south tilt and downward movement. Any continuation through several floors is illustrative, not a retrieved NIST dynamic trajectory."},"visualization":{"scope":"North Tower only; all existing impact exterior geometry retained. No quantitative sag field added on floor99.","composition":"One continuous reconstructed sequence: retained impact structure, floor sag, south-wall bow, early upper-section tilt, stop at a chosen 2 degrees south to show only the onset. Source states are available separately.","floorInterpolation":"ILLUSTRATION ONLY: Signed contour midpoints, inverse-distance weights squared with 2ft\u00b2 regularizer, 64x64 grid; approximate \u00b110ft plan registration. Boundary taper is reconstructed. Documented detached seats retain vertical sag and lose lateral pull-in coupling. Addition of these contours to the native impact geometry is unverified, not a NIST displacement increment.","wall":{"peakInwardIn":55,"observationalUncertaintyIn":6,"peakColumn":316,"peakFloor":97,"extent":"Smooth reconstructed south-face field between floor94 and100. No assertion of equal bow on every face or floor.","source":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-3.pdf","reference":"\u00a76.2.6, p.59; Figs6-14/6-15, pp61\u201362"},"upperMotion":{"nominalStartFloor":98,"southTiltDegrees":2,"observedTiltStatus":"NIST reports at least 8 degrees during early motion. The illustration stops earlier at a user-selected 2 degrees limit; this is not a measured frame or failure threshold.","pivot":"Assumed tower-center point at floor98 reference elevation.","source":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1.pdf","reference":"\u00a76.14.6 p151; Table6-10 p153","mode":"Sequence to 2 degrees: reconstructed pivot, settlement and interpolation. Source states: separate observed imagery and reported at-least-8-degree orientation.","settlementRule":"Assumed center settlement = tower half-width times sin(tilt). This keeps the nominal north F98 reference edge from rising in height, but does not fix it horizontally or identify a real hinge.","stop":"All motion stops together at 2 degrees south to show only the beginning. No post-endpoint descent or additional poses.","observedMinimumSouthTiltDegrees":8},"continuation":{"stopSouthTiltDegrees":2,"centerSettlementFt":3.615006200100725,"nominalSouthReferenceEdgeTravelFt":7.23001240020145,"placementStatus":"Derived display geometry only, not NIST-measured descent. There is no independent story-travel target.","movingLowerFloors":[92,93,94,95,96,97],"transitionBaseFloor":91,"status":"An illustrative transition distributes shortening across seven story intervals while preserving sampled floor order. It is not an observed interior sequence or a contact, resistance or dynamic failure solution.","timing":"Normalized playback progress. Sag and wall bow are held while tilt and chosen settlement develop together. No physical duration, velocity or acceleration inferred.","mode":"Sequence to 2 degrees only; no extra motion in Source states."},"defaultMode":"illustration"},"evidenceAudit":{"findings":[{"issue":"Three-story drop and distributed floors92\u201397 shortening have no supporting NIST trajectory.","disposition":"No independent three-story target. The unified sequence stops at a chosen 2 degrees, with settlement and the lower-floor transition explicitly reconstructed. Source states remain available without those motions.","source":"NCSTAR 1 Table6-10, p153; 1-6D p314"},{"issue":"100min B\u1d62 slab contours are not verified increments relative to our reconstructed impact geometry.","disposition":"Original calculation snapshots remain available in Source states. The sequence applies an explicitly reconstructed, unverified additive overlay.","source":"NCSTAR 1-6C \u00a7\u00a75.5.6\u20135.5.7, pp95 and107\u2013108; 1-6D Fig5-4 p316"},{"issue":"Subsystem seat losses do not supply a measured timed release or final global attachment map.","disposition":"No coupling or seat-release animation in Record.","source":"NCSTAR 1-6D Fig5-5 p316; Figs2-36/37 pp49\u201350"},{"issue":"Observed55\u00b16in maximum and calculated43in response are distinct.","disposition":"Both identified by evidence type; neither supplies a full measured surface.","source":"NCSTAR 1-3 \u00a76.2.6 p59; NCSTAR 1 Table6-10 p153"}],"observedOnsetAsset":"assets/NCSTAR1-6D_fig5-8_observed_initiation.png","observedOnsetSource":"https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-6dv2.pdf","observedOnsetReference":"Figure5-8, printed318 / full PDF382; photograph Tim Main / Mike Ballou \u00a92001","observedTiltSequenceAsset":"assets/NCSTAR1-6_fig6-11_west_tilt_sequence.png","sourceStatesView":{"floorState":"Native impact context; no additive thermal displacement or inferred coupling. Original B\u1d62 source figures displayed separately.","wallState":"Static reconstruction of the observed maximum only, on exterior wall members. Continuous surface and concealed regions are interpolated, not measured.","onset":"Original source photograph with textual at-least-8\u00b0 south orientation; 3D context remains held. No exact pivot, translation or lower-floor motion."}}}