TYPE 1 · TYPICAL OFFICE TRUSS
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The selected tower, floor and source records will appear here.
Elevation · floor 1 = 0Relative datum
Story Height12.00 ft
NIST TypologyType 1
Framing SystemTruss-framed tenant area
Contract SheetSA-104 (Port Authority)
NIST Panel DiagramFigure G-1 (p. 193)
Inspection case & source records
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Exterior: observed-damage reconstruction shared by both cases. Interior: the selected NIST calculation. The evidence panel separates observed schematics from calculated exterior results. Unmeasured shapes remain representative.
Source checks & assumption register ↗
Hat-truss bracing & connection details ↗
Foundation source details ↗ · Sublevels B1–B6 · plans ↗
Selected member record
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PRIMARY SOURCE RECORD
Story heights follow the LERA schedule, with elevations relative to floor 1. North floors 92–100 and South floors 77–85 have differentiated core-opening profiles; reviewed hoistways, stairs and services follow each tower’s original drawings. Unreviewed areas retain reference geometry. Core beams still use the North floor-96 and partial South floor-77 prototypes. Exact beam sections, joints, smaller openings and some machine/transfer-level clearances remain unresolved. Original-plan geometry does not establish all September 2001 conditions or post-impact passability.
NIST NCSTAR 1-2A Appendix G (pp. 191–196); NCSTAR 1-1 §2.2.2.
