多年冻土区桥墩抗震性能研究

STUDY ON ASEISMATIC PROPERTY OF BRIDGE PIERS IN PERMAFROST REGION

利用粘-弹性边界模拟波向无穷远辐射的具有无穷边界问题的计算方法及有限元方法,计算分析了在各种地震波作用下,不同的场地上,不同桥墩高度对地震的响应。考虑了冻土层和无限边界的影响。计算结果表明,有冻土层存在时,桥墩应力的变化,与场地区域地震动和桥墩的特性有关。在结构抗震设计时,应考虑这些因素的影响。

Numerical simulation is made on infinite media. A viscous-spring boundary is used for simulating infinite boundary condition. The seismic responses of multifarious piers are calculated by finite element method in various grounds under various earthquake wave. The influence of frozen earth layers is analyzed. The results indicate that the stresses of piers are related to factors such as frozen earth layers,earthquake characteristics and pier property,and these factors should be considered in aseismatic design of structures.