Seismic response analysis of rigid-frame tied-arch bridges under strong after-shock

Rigid-frame tied-arch bridges have become one of widely-used bridges due to the good performances. However, the research on its seismic performance, especially on the seismic response of its structure under strong after-shock, is not sufficient. The strong after-shock time-history which obtained through statistical laws was used as input earthquake motion in the paper. The structure-damaging index from “first exceed” and “cumulative damage” destruction were completely considered to verify the damage status of structures. The seismic response of a typical rigid-frame tied-arch bridge under strong after-shock was analyzed in this paper. The results show that the load of strong after-shock intensifies the structure damage, which is important to researches and analysis of the seismic performance for key bridges.