Chapter 15 - Efficient earthquake intensity measures for probabilistic seismic demand models of skewed RC bridges

Abstract

This study aims to identify the significant earthquake intensity measures for seismic performances of a skewed reinforced concrete bridge. For that, a set of 90 ground motions are employed for numerical analyses associated with 20 IMs. A series of nonlinear time-history analyses is performed to quantify seismic responses of the bridge. Seismic responses of the bridge are monitored in terms of the lateral displacement of bridge piers. Accordingly, probabilistic seismic demand models of the bridge are developed for each IM. Statistical properties, which are coefficient of determination, dispersion, and correlation coefficient, are calculated to identify efficient IMs with the seismic performance of the bridge. Numerical results reveal that the effective IMs are spectral acceleration, spectral velocity, spectral displacement at the fundamental period, acceleration spectrum intensity, effective peak acceleration, and peak ground acceleration.