Static and Dynamic Behavior of the High-pier and Long-span Continuous Rigid Frame Bridge

摘要

A structure model of three-span continuous rigid frame bridge was constructed based on the finite element method. Firstly, the static performances were obtained. Secondly, the modal analysis was performed to get the natural frequencies and periods. The dynamic characteristics of the bridge structure were summarized, and some improvement guidelines are suggested to overcome the shortcoming for the bridge structure. Then, seismic response analysis was carried out based on the EL-Centro wave. The input excitations adopted the combination of vertical wave plus longitudinal wave, or vertical wave plus lateral wave, or the combination of three directions. Based on the three excitation cases, some useful results were obtained, which include internal forces, displacements, accelerations time-history curves of the critical sections for the bridge structure. And some comments about the time-history curves are given. At last, some helpful conclusions are drawn based on the calculation and analysis above. The calculation methods and results in this paper can provide some referenced information for the engineering design.