We selected the Non-linear Dynamic Procedure (NDP) of ASCE 41-06 to demonstrate SPC2 compliance for a stair/elevator tower servicing two buildings of a critical care facility. The stair/elevator tower and adjacent hospital wings are separated from one another by a two to three inch building gap. Due to the gap size between the stair/elevator tower and adjacent hospital wings, a peer review identified the propensity for global instability due to pounding between buildings, potentially leading to collapse of the stair/elevator tower. We modeled pounding explicitly in our analysis to address the peer reviewer's concern. In addition, we modeled the effect of rocking behavior and sliding foundations. The NDP permitted a minimal retrofit for the stair/elevator tower, significantly reducing projected construction cost and schedule relative to our previous design based on linear analyses, while still satisfying SPC2 requirements.
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