考虑桩-土动力相互作用的渡槽结构水平地震响应分析  

Horizontal seismic response analysis of aqueduct with pier-soil dynamic interaction

作　　者：李正农[1] 张盼盼[1] 朱旭鹏[1] 周振纲[1] 卢剑[1] 

机构地区：[1]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《土木工程学报》2010年第12期137-143,共7页China Civil Engineering Journal

基　　金：国家十一五科技支撑计划(2006BAB04A05)

摘　　要：以Housner流-固耦合模型和Penzien桩-土相互作用模型为基础,建立一种同时考虑流-固耦合与桩-土相互作用的渡槽结构简化计算模型,并给出其计算参数。该计算模型分为等价体系和自由场体系,并采用自由场输入。推导同时考虑弯曲变形和剪切变形时的群桩刚度矩阵,采用分别计算各子结构阻尼的方式来考虑整个结构的阻尼,并采用等效线性化原理来考虑土体的非线性。以某渡槽为例,采用该模型对其进行分析,并与刚性基础模型对比。计算结果表明,两种情况下的自振特性和水平地震响应均有较大差别,在渡槽抗震研究与设计中不能忽略桩-土相互作用。同时采用该计算模型对拟动力试验模型进行分析,并与试验结果比较,二者基本一致,说明计算模型的有效性。Based on Housner fluid-structure coupling model and Penzien pier-soil interaction model,a simplified model of an aqueduct was developed with fluid-structure coupling and pier-soil interaction.The model includes equivalent system and free field.Stiffness matrix of the piles was given,including bending and shear deformation effects.The damping of the entire structure was calculated using the damping of each of the sub-structures.Equivalent linearization principle was employed to deal with the nonlinear characteristics of the soil.Analysis was carried out,and comparison with the rigid foundation model performed.The results of these two models were significantly different in free vibration characteristics and horizontal seismic responses.The results were in good agreement with experimental data.

关 键 词：渡槽 流-固耦合 桩-土相互作用 等价体系 自由场 

分 类 号：TU352.1[建筑科学—结构工程]