Evaluation of a Modified-Ssap in Estimating Seismic Demands of a Torsionaly Flexible Building

Abstract eng:
Storey Shear-Based Adaptive Pushover (SSAP) procedure has originally been developed for estimating seismic demands of planar frames. An extension and modification of the SSAP, has recently been proposed to estimate seismic demands of asymmetric buildings, represented by a 3D structural model. In order to investigate the capability of the proposed Modified-SSAP in severe mass asymmetric buildings, in the current paper, the method is evaluated for a 12-story asymmetric reinforced concrete moment resisting building with a torsionaly dominant fundamental natural mode, representing torsionaly flexible buildings. Results of the storey drift predictions of the Modified-SSAP are compared with Nonlinear Response History Analysis (NRHA) as well as estimations of the well-known Modal Pushover Analysis (MPA) procedure, subjected to a set of seven near-field ground motions. Alternative correction factors for the target displacement to improve the results are also examined. An acceptable compatibility of storey drift estimations of pushover procedures is observed, while Modified-SSAP is more compatible with the results of rigorous NRHA when proper correction factors for the target displacement are applied.

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