Nonlinear Seismic Response Analysis and Seismic Performance Evaluation of A Reinforced-Concrete Cable-Stayed Bridge Tower Using IDA Method

摘要

Nonlinear Seismic Response analysis and Seismic performance evaluation for cable-stayed bridge are very important, especially for the tower of it. Based on the recent researches, A simplified single tower finite element model was developed to modelling the seismic response under the longitudinal excitation in this paper. In order to investigate the nonlinear seismic response of the tower, a fiber flexural element was adopted and the P-delta Effect was considered in present study. On the other hand, the incremental dynamic analysis (IDA) of this Tower has been done herein, in order to evaluate the seismic performance of the tower more reasonably. The results show the damage zone (or the plastic zone) for this tower mainly concentrated in three regions. According to IDA analysis and the summary curves of it, seismic damage state evaluation can be more reasonable which has more probabilistic characteristic. Finally, some suggestions on the definition of the global ductility factor for a complex structure like the tower of cable-stayed bridge were given herein.