Anti-seismic reliability analysis of continuous rigid-frame bridge based on numerical simulations

摘要

This paper investigates the earthquake-resistance performance of a continuous rigid-frame bridge under different strong seismic loads. To this end, an ideal finite element mechanical model for a continuous rigid-frame bridge was first constructed through the use of ANSYS codes. Based on the developed model, the seismic behaviours of the continuous rigid-frame bridge with and without a base isolated system were investigated with respect to the natural frequencies, mode shapes, displacements and stresses. Further, based on the foregoing results and the limit state method, the earthquake-resistance reliability was calculated. From the computed results, it is found that this large continuous rigid-frame bridge has a relatively high seismic-resistance capacity and could satisfy the design requirements under the action of earthquake excitations. The findings herein are also expected to provide some design guidelines on the seismic analysis for other similar large engineering structures.