连续刚构桥动力数值模拟及减震技术研究

Dynamic Numerical Simulation and Damping-isolation Technology for Continuous Rigid Frame Bridge

以京沪铁路大跨度箱形截面连续刚构桥为研究对象,运用ANSYS大型有限元分析软件对其动力特性进行了数值模拟分析,通过比较纵横向地震波作用下的桥梁动力响应,得出连续刚构桥在进行动力分析时需要同时考虑两种方向波对结构的不同影响.以此为基础,分析了采取不同抗震、减震措施时对该桥梁结构力学性能的影响.分析结果表明:支撑体系的刚度对结构的动力特性影响较大;圆角空心墩的减震效果好于矩形空心墩;桥墩的刚度越大,地震作用下的结构内力越大.

Based on the study of JINGHU long-span railway continuous rigid frame bridge by ANSYS, the dynamic properties of this bridge are studied by the comparing of bridge dynamic effect under the earthquake wave along and across the bridge. The two direction earthquake waves should be considered during the dynamic analysis. Based on the above model, the effects of three damping-isolation ways are studied. The results show that the stiffness of supporting system should be considered under the load of the earthquake, and larger the rigid of the pier, smaller the damping-resist.