等效线性及非线性方法的土坝地震反应分析  

Seismic Response Analysis of Soil Dam Using Equivalent Linear and Nonlinear Method

作　　者：马宗源[1] 乔蓓[1] 王振华[1,2] 党发宁[1] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]西北电力设计院,陕西西安710032

出　　处：《水电能源科学》2013年第12期80-82,79,共4页Water Resources and Power

基　　金：中央财政支持地方高校发展专项资金特色重点学科项目(106-00X101;106-5X1205);西安理工大学高学历人员科研启动经费基金资助项目(118-211307)

摘　　要：为对比分析等效线性及非线性方法的土坝地震反应计算结果,采用有限元程序QUAKE及有限差分程序FLAC,基于Rayleigh阻尼模型对砂土地基上的均质粘性土坝进行地震反应分析,验证了两种程序计算结果的一致性。并在此基础上,加载El Centro地震加速度水平分量,采用有限元法的等效线性化模型及有限差分法的完全非线性模型计算土坝坝顶的地震反应时程。结果表明,等效线性化方法计算出的地震峰值反应加速度低于完全非线性方法,而完全非线性方法计算出的地震反应加速度滞后于等效线性化方法,明确了考虑及忽略土体动力非线性在土坝动力反应过程中产生的差异。The seismic response analysis of a clay dam on homogeneous sandy soil foundation is analyzed by using fi- nite element code QUAKE and finite difference code FLAC. Comparing the calculation results of Rayleigh model yield by finite element and finite difference method, the two methods are equivalent. Furthermore, EI Centro seismic horizontal acceleration is loaded, and the seismic response of the earth dam is calculated by QUAKE with equivalent linear model and FLAC with fully nonlinear model, respectively. The results of the two methods show that the peak value of the seis- mic response yielded by the equivalent linear method is lower than that of the fully nonlinear method, and the seismic re- sponse of the dam yielded by fully nonlinear method is hysteresis than that of the equivalent linearization method. The difference of dynamic response is determined hy considering dynamic nonlinearity of soil or not.

关 键 词：土坝地震反应 动力非线性 等效线性化方法 完全非线性方法 

分 类 号：TU435[建筑科学—岩土工程]