桥梁桩土相互作用的集中质量模型及参数确定

Lumped-mass Model and Its Parameters for Dynamic Analysis of Bridge Pier-pile-soil System

桩土相互作用是桥梁抗震研究中的难点 ,计算模型的选用和参数确定直接影响计算结果的精度 .为此 ,提出一种改进Penzien模型及其参数的确定方法 ,并以此模型采用动力反应时程方法对国外某桥进行了实例计算分析 。

This paper proposed a modified Penzien model that can be adopted for seismic analysis of bridge pier-pile-soil system.The determination methods of the model,such as the interaction spring stiffness and damping the equivalent mass for the soil around the piles were suggested.Using the proposed model,the simulation of seismic response for a single pier bridge with pile foundation was carried out,and the simulation results showed that the model and its parameters determination were proper for seismic analysis of soil-structure interaction problem.