Seismic fragility curves for highly skewed highway bridges

Abstract

In this paper, a multi span concrete girder highway bridge with a 60 degree skewness is used for developing seismic analytical fragility curves for different performance level of the bridge. A detailed finite element modeling of the bridge is presented. Incremental dynamic analysis (IDA) is applied to the bridge in longitudinal direction of the bridge to capture the seismic response of the bridge incrementally. A suite of 14 earthquake ground motions with different range of PGAs are used in nonlinear dynamic analysis of the bridge. Different spectral intensity measures and PGA are studied to find the proficient intensity measure to figure out the analytical fragility curves. The results show that the Sa (1.2 T1,5%) is the most proficient intensity measure for the current study.