多轴等效应变损伤模型及其在混凝土坝工作性态分析中的应用  

A multi-axis equivalent strain damage model and its application in analysis of working performance of concrete dams

作　　者：周秋景[1] 李同春[2] 张国新[1] 

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]河海大学水资源高效利用与工程安全国家工程研究中心,江苏南京210098

出　　处：《水利水电科技进展》2015年第3期42-46,118,共6页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51439005);国家重点基础研究发展计划(973计划)(2013CB036406);"十二五"国家科技支撑计划(2013BAB06B02)

摘　　要：基于混凝土单轴拉伸应力应变曲线模型和四参数等效应变,给出一种修正的四参数多轴等效应变损伤模型,通过与单轴拉伸、单轴压缩、双向拉伸、双向压缩、双向拉压以及三向压缩这6种受力状态的试验资料进行对比以验证其有效性。采用该多轴等效应变损伤模型对混凝土剪切试验组合受力情况、混凝土重力坝和混凝土拱坝等结构工作性态进行数值分析,得到静力荷载下的结构损伤和应力响应,评价了结构正常工作性能及安全性。结果表明,剪切试验数值模拟结果与试验成果吻合良好,可以对以剪切为主的组合受力情况进行分析,该模型适用于复杂应力状态下的计算;典型重力坝和拱坝损伤分布区域及应力分布规律合理,该模型可以对混凝土坝工作性态及其安全性进行分析。A modified four-parameter multi-axis equivalent strain damage model is presented based on a typical uniaxial tensile stress-strain curve model and four-parameter equivalent strain. To verify the concrete damage model, test results under six kinds of stress states, including uniaxial tension, uniaxial compression, biaxial tension, biaxial compression, biaxaial tension-compression, triaxial compression are compared with experimental results. With the concrete damage model, this paper numerically analyzed combined force situations of concrete shear tests and working performances of concrete gravity dams and concrete arch dams. The damage and stress distribution of these structures under static loadings are obtained and analyzed. The results showed that the numerical simulation results of shear tests coincide with experimental results. Therefore, the model can analyze the combined force situation with the shear as the main force and the model is suitable for the calculation under complex stress states. In addition, the reasonable damage and stress distribution rules of typical gravity dams and arch dams indicated that the model could analyze the working performance and safety of concrete dams.

关 键 词：混凝土坝 损伤模型 多轴等效应变 工作性态 

分 类 号：TV642[水利工程—水利水电工程]