基于能量耗散的混凝土塑性-损伤模型
发布时间：2019-06-13 19:34
【摘要】：应用连续介质损伤力学和塑性流动理论,建立了基于能量耗散机制的塑性-损伤耦合模型。模型采用非关联塑性流动法则描述混凝土不可恢复变形的演化。模拟刚度退化的损伤变量演化函数则通过断裂能和应力-非弹性应变空间中的累积耗散能量建立。基于有限元程序ABAQUS,推导了增量格式的材料雅可比矩阵,构建了塑性-损伤模型的仿真分析程序。应用模型分析混凝土板平面内双轴受压试验、混凝土切口梁试验和钢筋混凝土梁受弯试验,计算获得的构件响应与试验结果吻合良好,能够反映多轴应力状态对混凝土抗压强度的影响,也能准确模拟损伤导致的构件非线性反应。
[Abstract]:Based on the damage mechanics and plastic flow theory of continuum, a plastic-damage coupling model based on energy dissipation mechanism is established. The uncorrelated plastic flow rule is used to describe the evolution of unrecoverable deformation of concrete. The evolution function of damage variables simulating stiffness degradation is established by fracture energy and cumulative dissipative energy in stress-inelastic strain space. Based on the finite element program ABAQUS, the Jacob matrix of incremental format is derived, and the simulation analysis program of plastic-damage model is constructed. The biaxial compression test, concrete notched beam test and reinforced concrete beam bending test in the plane of concrete slabs are analyzed by using the model. The calculated response of the members is in good agreement with the test results, which can reflect the influence of multi-axial stress state on the compressive strength of concrete, and can also accurately simulate the nonlinear response of members caused by damage.
【作者单位】： 重庆大学山地城镇建设与新技术教育部重点实验室;重庆大学土木工程学院;石河子大学水利建筑工程学院;
【基金】：国家自然科学基金项目(51578088) 新疆生产建设兵团博士基金项目(2012BB013)
【分类号】：TU528
本文编号：2498765
[Abstract]:Based on the damage mechanics and plastic flow theory of continuum, a plastic-damage coupling model based on energy dissipation mechanism is established. The uncorrelated plastic flow rule is used to describe the evolution of unrecoverable deformation of concrete. The evolution function of damage variables simulating stiffness degradation is established by fracture energy and cumulative dissipative energy in stress-inelastic strain space. Based on the finite element program ABAQUS, the Jacob matrix of incremental format is derived, and the simulation analysis program of plastic-damage model is constructed. The biaxial compression test, concrete notched beam test and reinforced concrete beam bending test in the plane of concrete slabs are analyzed by using the model. The calculated response of the members is in good agreement with the test results, which can reflect the influence of multi-axial stress state on the compressive strength of concrete, and can also accurately simulate the nonlinear response of members caused by damage.
【作者单位】： 重庆大学山地城镇建设与新技术教育部重点实验室;重庆大学土木工程学院;石河子大学水利建筑工程学院;
【基金】：国家自然科学基金项目(51578088) 新疆生产建设兵团博士基金项目(2012BB013)
【分类号】：TU528
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1 安占义;李谦;曹鹏杰;尚春林;;混凝土确定性损伤模型和随机性损伤模型概述[J];四川建材;2013年04期
，本文编号：2498765
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