多箱组合连续梁桥抗震分析及优化

The Seismic Analysis and Optimization of Multiple Box Composite Continuous Beam Bridge

以临汾环城一级公路汾河大桥引桥为工程背景,采用反应谱法对多箱组合连续梁桥进行了地震效应计算分析,发现初步设计方案采用盆式橡胶支座抗震性能较差,结构受力不够合理,最后通过分析对比,提出了采用减震性能较好的天然橡胶支座作为抗震设计优化措施,使各桥墩均匀地承受地震效应,桥梁的整体抗震性能明显提高。

Taking an approach bridge in Linfen as the engineering background, using response-spectrum method, this paper calculated and analyzed seismic effect of multiple box composite continuous beam bridge. It also found the preliminary design scheme that used basin rubber bearing had poor seismic performance, structure stress was not reasonable. Finally through analysis and comparison, it put forward natural rubber bearing with better damping performance as seismic design optimization measures, which made each pier could bear the earthquake effect evenly, the overall seismic performance of the bridge improved significantly.