INSTRUMENTAL ASSESMENT OF THE PREDICTIVE CAPABILITY OF NONLINEAR STATIC ANALYSIS PROCEDURES FOR SEISMIC EVALUATION OF BUILDINGS

摘要

The nonlinear static procedures (NSP) in FEMA-440 are evaluated by comparing, for five instrumented buildings, predictions with estimates of the structural response obtained from an observer. Differences in the predictive ability between the various NSPs in FEMA-440 are found unimportant from a practical perspective. The scaling needed to ensure that predictions have no more than a 10% chance of being un-conservative are found to be around 1.7 and 2.7 for story shears and for drifts, respectively. NSP predictions in the lower half of the buildings, due to stronger contribution of the lower modes, are found significantly more accurate than the average over the full height.