高混凝土重力坝孔口应力非线性数值模拟

为准确描述重力坝孔口应力分布，提出高混凝土重力坝孔口应力的非线性数值计算分析整体方案．首先对坝体进行线性计算获得孔口应力分布规律及峰值以便于配筋，然后基于损伤塑性模型对孔口剖面作非线性应力应变分析，考察钢筋应力及其止裂效果．以某钢筋混凝土重力坝工程为背景，依据规范简化混凝土单轴应力一应变曲线，在Abaqus平台上对中孔的3个剖面进行非线性有限元分析，考察中孔在坝体自重和内水压力作用下的结构特性和损伤分布规律等，并重点探讨损伤区域的演化及钢筋应力等问题．结果表明数值模拟结果与模型试验有较好的一致性，可为同类型工程的数值计算和设计提供一定借鉴．

Nonlinear numerical simulation on orifice stress of high concrete gravity dam

To describe the stress distribution of orifice of concrete gravity dam accurately, a total solution is proposed to nonlinear numerical computation and analysis on orifice stress of a high concrete dam. To facilitate reinforcement, the distribution and peak value of orifice stress are obtained by the linear analysis on dam body. Based on the plastic damage model, the nonlinear analysis on stress strain of orifice section is done to investigate the stress of reinforcing steel and its effect of crack arrest. Taken a reinforced concrete dam as an example, the uniaxial stress strain curve is simplified according to criterion, and the nonlinear finite element analysis on three section of middile hole are performed by Abaqus. The structural characteristics and damage distribution of the middle hole are investigated under the effect of gravity, inside water pressure and so on, and the problems such as crack development, reiforcing steel stress, and so on, are emphasized. The result of the numerical simulation is in good agreement with the one of the experiment. So the method and the results can provide some references for the numerical simulation and design of the similar project.