重力坝地震整体损伤指数的初步探索  

Exploratory development of global seismic damage indices of concrete gravity dam

作　　者：寇立夯[1] 金峰[1] 张楚汉[1] 王进廷[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《中国水利》2008年第11期28-30,共3页China Water Resources

基　　金：国家自然科学基金项目(90510018;90715041)

摘　　要：基于塑性损伤力学对混凝土重力坝进行非线性动力反应分析,根据损伤因子分布得到局部损伤指数,并以局部能耗作为权重对其进行加权平均得到整体损伤指数。同时以Koyna大坝为例,对坝体在不同功能状态的损伤指数进行了标定。结果显示,整体损伤指数超过0.15时,坝体产生中等程度损伤;整体损伤指数超过0.4时,坝体产生严重损伤。Koyna大坝在1967年地震中损伤指数为0.40,因此认为坝体产生严重损伤。Nonlinear seismic analysis of concrete gravity dam is performed based on the plastic damage theory. Local damage indices are derived from the damage indices of each finite element, weighted by the element area. Global damage index is calculated by taking weighted average of the local indices throughout the dam, with local energy absorptions as the weights. As a sample, the responses of Koyna dam are used to calibrate the proposed damage measure. It demonstrates that damage index higher than 0.15 may show the state of moderate damage, damage index higher than 0.4 may show the state of severe damage. Under the excitation of 1967 Koyan earthquake records, the damage index of the dam is 0.40.

关 键 词：水工结构 地震分析 损伤评价 损伤指数 能耗 

分 类 号：TV642.3[水利工程—水利水电工程]