上承式拱桥横向结构减震分析

Analysis on the Lateral Vibration Control of Top-Bear Arch Bridges

以两座跨度不同上承式钢筋混凝土拱桥为例,利用ANSYS有限元分析功能,首先对它们进行了动力特性分析,并对结果进行了对比,得出了相应的结论;然后在原桥模型上加设横向阻尼支撑,采用三条地震记录,运用动态时程分析法进行了地震响应分析,结果表明横向阻尼支撑能显著减小拱平面外的地震反应。

Taking two different span top-bear arch bridges as example, the dynamic characteristics of them are analyzed and then the results are compared by utilizing ANSYS program. Then lateral damping braces are set in two bridges, making use of three seismic records, the seismic response of bridges is analyzed by dynamic time history method. The results show that the lateral damping brace can remarkably decrease seismic response of the bridge in the lateral plane.