摘要
浅平基桥墩在承受强震作用时,其基础与地基之间会发生提离,地基土会进入塑性状态。精确模拟上述两个问题是非常困难的。本文分析中地基采用了能考虑基础提离及地基塑性的弹塑性Winkler地基模型,采用1940年El Centro(NS)地震记录作为输入,对三个不同高度的双柱式浅平基桥墩进行了非线性时程分析。研究结果表明,基础提离和地基塑性对双柱式桥墩的地震反应有很大影响。考虑地基非线性后,墩顶位移增大,剪力减小,对保护桥墩减小震害是有利的。
When the bridge piers with shallow foundation are subjected to intense earthquake excitations, the uplift of foundations will occur and the foundation soil will enter into plasticity. It is very difficult to use an accurate method to simulate the uplift and yield of supporting soil. An improved Winkler foundation model, which could be used to consider uplift and yield, was employed in the analysis. The 1940 El Centro（NS） earthquake record was input to a double-column bridge pier with shallow foundation, so that the nonlinear responses were obtained. The following conclusions can be drawn from the nonlinear analysis that the uplift and yield of supporting soil have important effect on the seismic responses of double-column bridge piers. Compared with the linear analysis, the displacement of the double-column piers increases and the internal force decreases.
出处
《地震工程与工程振动》
CSCD
北大核心
2009年第4期125-131,共7页
Earthquake Engineering and Engineering Dynamics
基金
教育部高等学校骨干教师资助计划资助
关键词
桥梁工程
提离
屈服
弹塑性
WINKLER地基模型
双柱式桥墩
地震反应分析
bridge engineering
uplift
yield
elasto-plastic
Winkler foundation model
double-column bridge pier
seismic response analysis
