What Is a Progressive Collapse Design Requirement?
Progressive collapse design prevents the disproportionate (the local failure — the Ronan Point; the column's loss cascading) via the alternate path (the bridging over the lost column), the tie forces (the connections' — the catenary), and the key elements (the hardened — the blast's). The requirement: the GSA/DoD (the federal — the UFC 4-023-03), the IBC (the structural integrity — the general). The abnormal loading's design — the building surviving the unthinkable.
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The methods
The alternate path (the column removed — the analysis; the bridging — the beams'; the acceptance — the rotations), the tie forces (the peripheral, the internal — the connections'; the catenary — the large-deflection), and the key element (the specific local — the hardened; the blast's).
When required
The federal (the GSA/DoD — the UFC's; the occupancy's), the high-risk (the iconic — the threat's; the owner's), and the IBC (the integrity — the general; the large — the panels'). The risk (the assessment — the threat's; the proportionality).
Analysis and detailing
The linear static (the 2x — the dynamic increase; the screening), the nonlinear (the pushdown — the ductility; the acceptance), and the detailing (the continuity — the steel's; the ties' — the catenary). The progressive collapse is the robustness — the structure's redundancy designed.
The bottom line
Design against progressive collapse via alternate-path analysis, tie forces, or hardened key elements (UFC 4-023-03 for federal) — ensure structural continuity and catenary-capable connections.
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