东尖坨沙河大桥地震响应及减震效果分析

Research on the Seismic Response and Damping Effect of the Dongjiantuo Shahe Bridge

以一座在建的多跨预应力混凝土连续梁桥为研究对象,建立空间有限元模型分析了其动力特性,进行了减隔震方案设计。分别通过反应谱法和非线性时程法分析了该桥采用减隔震措施前后的地震动力响应特性。通过抗震性能对比分析,研究了设置钢阻尼器对连续梁桥的减震效果。结果表明:阻尼器可以减小连续梁桥的地震反应,使墩底的内力分配均匀,有利于提高该类桥梁的抗震性能。

A 3-D finite element model of a PC long-span continuous girder bridge is established to analyze its dynamic characteristics. The antiseismic and seismic-relieving measures are designed. The seismic dynamic responses are analyzed before and after the application of seismic-relieving measures by response spectrum method and non-linear time history method. The results of earthquake resistant behavior is calculated and compared to investigate the antiseismic performance of continuous girder bridges. It was shown that the seismie response of bridges could be decreased by using metallie dampers, and the distribution of inner force in the bottom of bridge piers was made uniform. The analyses conclusions indicate that a good damping effect and a better earthquake resistant behavior of continuous girder bridges could be obtained with the help of metallic dampers.