高烈度区连续梁桥的减震设计方法研究

Research on earthquake-reduction design method of continuous girder bridges in a high-intensity earthquake area

本文以高烈度区的某三跨连续梁桥为例,分别采用基础隔震和消能减震两种措施进行结构的减震分析;针对隔震结构减震效果好但主梁位移过大的特点,提出了在采用铅芯橡胶隔震支座的同时设置粘滞阻尼器的减震方案,其非线性时程分析结果表明,该方案能有效地降低结构的地震反应,可供工程实践参考。

By taking a three-span continuous girder bridge in a high intensity earthquake area as an example, leadrubber bearings and viscous dampers are adopted to reduce the earthquake response of structure respectively in this paper, and the calculating results demonstrates the higher earthquake-reduction effectiveness and the larger girder＇s displacement for the isolated structure. Hence, a new earthquake-reduction method by combining lead-rubber bearings and viscous dampers is recommended for the continuous girder bridge structure. The calculating results show from the nonlinear time history analysis that the new design method can reduce the earthquake response of structure effectively, and can be used as a reference to engineering practice.