混凝土重力坝整体抗震及破坏特性分析  

Anti-seismic and Failure Characteristics Analysis of Integral Concrete Gravity Dam

作　　者：张社荣[1] 俞祥荣[1,2] 王高辉[1] 王超[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]中国水利水电第十四工程局,云南昆明650041

出　　处：《四川大学学报（工程科学版）》2012年第6期34-39,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家创新研究群体科学基金资助项目(51021004);水利工程仿真与安全国家重点实验室开放基金资助

摘　　要：强震荷载作用下混凝土重力坝各坝段间的动力相互作用不可忽视。利用能考虑混凝土软化特性并可反映实际损伤能量耗散的混凝土塑性损伤本构模型,通过建立重力坝整体3维有限元模型,考虑地基辐射阻尼作用和坝体接缝非线性动力接触作用,采用时域分析方法对官地碾压混凝土重力坝进行整体3维非线性地震反应分析,研究大坝整体抗震特性,得到大坝的损伤破坏区域及抗震薄弱部位,揭示横河向地震输入对大坝地震反应的影响。研究表明:考虑坝段间的动力相互作用后,大坝整体抗震性能得到提高;考虑横河向地震输入后,大坝的动力响应及损伤破坏范围均有所增大。The effect of dynamic interaction between adjacent monoliths should be considered under strong loading conditions. A damage mechanics model associated with strain softness after post-peak for concrete was proposed to reflect reasonable damage dissipation of concrete fracturing. A three-dimensional integral dam FEM model was established to analyze the seismic response and the integral anti- seismic characteristics of Guandi RCC gravity dam,with the consideration of the energy radiation and dynamic contact of the monoliths. The damage region and the seismic weak parts were obtained. The influence of the cross-stream ground motion input was discussed. The results showed that the integral seismic performance of dam is improved with consideration of the dynamic contact of the monoliths. Con- sidering the cross-stream ground motion input, the dynamic response and damage region are increased.

关 键 词：混凝土重力坝 抗震特性 非线性有限元 损伤本构模型 破坏模式 粘弹性人工边界 

分 类 号：TV312[水利工程—水工结构工程]