基于振型叠加的高土石坝抗震稳定有限元法及其应用  

Finite Element Method for Seismic Stability Analysis of High Earth-rock Dam Based on Mode Superposition and Its Application

作　　者：胡军[1] 钟龙[1] 杨昕光[2] 

机构地区：[1]辽宁科技大学矿业工程学院,辽宁鞍山114051 [2]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024

出　　处：《水电能源科学》2013年第7期60-62,35,共4页Water Resources and Power

基　　金：国家自然科学基金资助项目(50979014;51274503);辽宁省教育厅基金资助项目(L2011040)

摘　　要：为反映高土石坝地震反应加速度分布的特点,基于振型叠加方法提出了一种应用于高土石坝抗震稳定分析的有限元方法,首先对大坝进行振型分析,基于振型叠加方法得到作用于单元节点上的等效拟静力地震荷载,再用强度折减弹塑性有限元法计算获得大坝抗震稳定安全系数。通过对典型高心墙土石坝的抗震稳定分析,验证了该方法的可行性与合理性,所确定的坝体地震惯性力分布特征为"鞭梢效应"有所增加,且坝体材料特性影响地震加速度分布。In order to reflect the properties of the seismic acceleration response distribution of the high earth rock dam, a new finite element method based on mode superposition is proposed. The method can be used to study the seismic stability of the high earth-rock dam. Firstly, modal analysis is carried out on the dam, and the equivalent pseudo-static seismic load applied to the element nodes is gained by using the modal superposition method. And then, the dam seismic stability safety factor is obtained by calculating with strength reduction elastic-plastic finite element method. Based on the seismic stability analysis of the typical high core earth-rock dam, it verifies the feasibility and rationality of the method. The characteristic of the dam earthquake inertia force distribution is ＂Whip Ending Effect＂. At the same time, the material properties of the dam have impact on the seismic acceleration distribution.

关 键 词：高土石坝 抗震稳定分析 振型叠加 加速度分布 强度折减有限元法 

分 类 号：TV641.1[水利工程—水利水电工程]