桩——土共同作用时连续梁桥隔震时程分析

结合一座9跨连续梁桥的工程设计实例,建立了梁体、桥墩和基础共同工作的空间有限元分析模型。选取3种桥梁支座形式,用不同单元来模拟其恢复力模型;并分别沿该桥顺、横桥向输入ElCentro波进行时程对比分析。分析表明:采用铅芯橡胶支座能延长结构的周期,减小桥墩底部的弯矩和剪力,并使剪力得以合理分配,同时梁体位移也不致过大,是一种有效的隔震装置。

Time Path Analysis of Shock Isolation of Continuous Girder Bridges under Pile-soil Interaction

With the example of a nine-span continuous girder bridge design, a model is set up with the joint action of the girder, pier and foundation for the spatial finite element analysis. Three types of bridge bearing are selected for simulation with different elements and for time path comparative analysis with the input of El Centro waves along and across the bridge. The analysis shows that the lead-rubber bearing is efficient for energy dissipation, which can lengthen the natural period of the structure, reduce the bending moment and shear force at the base of piers, and minimize the girder displacement.