Seismic Response Analysis of the Long-Span Curved Bridge under Multi-support Earthquake Excitations

Acceleration time histories of earthquake ground motion were obtained. In the simulation process, phase difference spectrum was adopted to capture the non-stationary character of the earthquake ground motion, coherence function was selected to consider the correlation effect, and an equivalence phase velocity varying with the frequency of earthquake wave, rather than an arbitrary velocity, was adopted to consider the wave passage effect. The simulated non-stationary ground motions could consider the temporal and spatial variation, and were used as the inputs for a long-span curved continuous rigid-framed bridge in vertical directions. The internal force of pier base was calculated. The correlation effect and the wave passage effect were discussed. The results showed that, the axial force of the pier base, calculated under the excitations the random earthquake ground motion with spatial variability, was larger than that calculated under the uniform excitation of the deterministic earthquake, and the bending moment and shear force of the pier base in the non-excitation direction may increase or decrease, depending on the actual condition.