Published in SMIP07 Seminar on Utilization of Strong-Motion Data, September 13, 2007, pages 57-80.
This paper evaluates current Nonlinear Static Procedures (NSPs) specified in the FEMA- 356, ASCE-41, ATC-40, and FEMA-440 documents using strong-motion data from reinforcedconcrete buildings. For this purpose, peak roof (or target node) displacements estimated from the NSPs are compared with the value derived from recorded motions. It is shown that: (1) the NSPs either overestimate or underestimate the peak roof displacement for several of the buildings considered in this investigation; (2) the ASCE-41 Coefficient Method (CM), which is based on recent improvements to the FEMA-356 CM suggested in FEMA-440 document, does not necessarily provide better estimate of roof displacement; and (3) the improved FEMA-440 Capacity Spectrum Method (CSM) generally provides better estimates of peak roof displacements compared to the ATC-40 CSM. However, there is no conclusive evidence of either the CM procedures (FEMA-356 or ASCE-41) 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.
Civil and Environmental Engineering