高烈度震区铅芯橡胶支座隔震桥梁抗震性能分析

高烈度震区桥梁在地震作用下的结构响应较为复杂,传统的抗震设计很难实现桥梁的抗震性能目标。通过对1座位于9度震区的桥梁进行E1地震作用下的多振型反应谱分析以及E2地震作用下的非线性时程分析,计算结果表明,在E1和E2地震作用下采用铅芯橡胶支座隔震桥梁的地震响应较未隔震桥梁均有大幅减小。因此,对于位于高烈度震区的桥梁可通过合理的减隔震设计使结构地震响应大幅减小,从而可提高结构的抗震安全性,实现桥梁抗震性能目标。

Seismic Performance Analysis of Bridges Isolated by Lead Rubber Bearing in High Seismic Intensity Area

The response of bridges in high seismic intensity areas under seismic action is relatively complicated,which makes it hardly possible to achieve the seismic performance with traditional seismic design. the modal response spectrum analysis under earthquake action E1 and nonlinear time-history analysis under earthquake action E2 are taken at a bridge in 9 degree seismic area. The results shown that the response of an bridge isolated by lead rubber bearing is much smaller than a non-isolation bridge under both earthquake action E1 and earthquake action E2. Therefore,the seismic response of bridges in high seismic intensity area can be greatly reduced through reasonable seismic isolation design,the structural seismic safety is thus improved and the seismic performance of bridges is guaranteed.