基于多轴等效应变动力损伤模型的混凝土坝工作性态分析  

Analysis on Working Performance of Concrete Dams with a Dynamic Multi-axis Equivalent Strain Damage Model

作　　者：周秋景[1] 张国新[1] 李同春[2] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038 [2]河海大学,江苏南京210098

出　　处：《水力发电》2014年第12期26-30,共5页Water Power

基　　金：973项目(2013CB036406;2013CB035904);"十二五"科技支撑项目(2013BAB06B02);中国水科院科研专项(1412);流域水循环模拟与调控国家重点实验室项目

摘　　要：基于混凝土典型单轴动力应力应变曲线,考虑强度和弹性模量的应变率效应,建立了一种单轴动力损伤模型,通过与单轴拉、压试验结果对比验证其有效性。在此基础上结合等效应力、等效应变、等效应变率,提出了一种多轴等效应变动力损伤模型,并将该损伤模型应用于混凝土剪切试验、典型混凝土重力坝、拱坝的数值分析,得到地震荷载下结构损伤和应力响应,评价了结构动力性能及安全性,为混凝土坝动力安全分析提供了一条有效途径。A dynamic uniaxial damage model is established based on a typical uniaxial tensile stress-strain curve and strain rate effect of strength and elastic modulus, and the results of model calculation are compared with the results of uniaxial tension and compression tests of concrete to verify the model. Then an amended dynamic multi-axis equivalent strain damage model is given based on the uniaxial model and equivalent stress, equivalent strain and equivalent strain rate. The amended model is used to study three typical concrete structures of concrete shear test, concrete gravity dam and concrete arch dam. The damage and stress distribution of these structures under seismic loading are given and analyzed. Based on the analysis results, the working performance and safety of these structures are evaluated. The results indicate that the dynamic damage model is an effective way to study the working performance and safety of concrete dams.

关 键 词：混凝土坝 动力损伤模型 多轴等效应变 等效应变率 工作性态 

分 类 号：TV642[水利工程—水利水电工程]