Evaluation of Current Nonlinear Static Procedures for Reinforced Concrete Buildings

Abstract eng:
This paper evaluates the nonlinear static procedures specified in the FEMA-356, ASCE/SEI 41-06, ATC-40, and FEMA-440 documents for seismic analysis and evaluation of building structures using strong-motion records of reinforced concrete buildings. For this purpose, maximum roof displacement predicted from the nonlinear static procedure is compared with the value “derived” directly from recorded motions. It is shown that: (1) the nonlinear static procedures either overestimate or underestimate the peak roof displacement for several of the buildings considered in this investigation; (2) the ASCE/SEI 41-06 Coefficient Method (CM), which is based on recent improvements to the FEMA-356 CM suggested in the FEMA-440 document, does not necessarily provide better estimate of the roof displacement; and (3) the improved FEMA-440 Capacity Spectrum Method (CSM) generally provides better estimates of the roof displacement compared to the ATC-40 CSM. However, there is no conclusive evidence of either the CM procedures (FEMA-356 or ASCE/SEI 41-06) or the CSM procedure (ATC-40 or FEMA-440) leading to better estimate of the peak roof displacement when compared with the value derived from recorded motions.

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