Study on the seismic safety assessment method for the entire structural system of upper deck-type steel arch bridges

Abstract

We investigated the applicability of a seismic safety assessment method that employs the load-bearing capacity of the entire structure as a limit value. Firstly, shake table tests were conducted on a steel frame model to examine the accuracy of numerical analysis methods was verified. Next, the verified analysis software was utilized on a supercomputer to analyze a large-scale model of a steel arch bridge using shell elements. As a result, it was confirmed that the maximum capacity of the entire structure calculated through Pushover analysis was up to about 16% lower than the seismic forces from dynamic analysis at the corresponding time. In indeterminate structures, the differential progression of damage in each component causes their maximum capacity to be influenced by the loading history.