Evaluation of FIV3 as an Intensity Measure for Collapse Estimation of Moment-Resisting Frame Buildings
Héctor Dávalos, Eduardo Miranda
Abstract
Seismic collapse estimations strongly depend on selecting an intensity measure that minimizes the dispersion in collapse capacities and any possible bias. This study evaluates the recently proposed Filtered Incremental Velocity (FIV3) intensity measure for estimating collapse intensities of moment-resisting-frame buildings and compares its performance with two traditional intensity measures, namely spectral acceleration at the first-mode period of the structure and spectral acceleration combined with an explicit consideration of the spectral shape proxy ε, and with two advanced intensity measures, namely Saavg and IMcomb. Comparisons are made using collapse results from six special moment frame buildings having 1 to 20 stories. It is shown that for buildings with periods of vibration shorter than 1 s, FIV3 provides the best overall results based on efficiency and sufficiency with respect to magnitude, distance, spectral shape, duration, and scale factor. For buildings with periods longer than 1 s, FIV3 is comparable to Saavg and IMcomb, and clearly outperforms Sa and Sa+ε. Based on these results, a generalization of FIV3 is proposed as an intensity measure for the seismic collapse estimation of moment frame buildings.