Seismic Resistance Analysis and Performance Evaluation of Large Span Continuous Beam Bridge in High Intensity Seismic Region

A typical large continuous beam bridge with span arrangement(55 + 4×90+55) m in a highway was selected as the engineering background, dynamic analysis model of bridge was established based on finite element software, at the same time the dynamic characteristics were also calculated. Seismic response of bridge structure under two levels of earthquake, exceeding probability of 63% in 100 years and exceeding probability of 2. 5% in 50 years, was studied based on the response spectrum method and time history analysis method. According to bending momentcurvature curve of pier checking section, the seismic performance of the bridge structure was evaluated. The analysis results show that the bridge is in elastic state under the E1 and E2 probability earthquake, and satisfies the design goal of elastic design of the lower structure. Research results of this article can provide reference for the similar bridge seismic design.