混凝土损伤塑性模型损伤因子的取值及应用研究

Study on Value and Application of the Damage Factors of Concrete Damaged Plasticity Model

ABAQUS混凝土损伤塑性模型可以有效用于混凝土结构性能研究,但模型中真实的损伤因子往往由于试验条件的限制难以被获取,为此提出一种损伤因子的计算方法。基于混凝土结构设计规范提供的混凝土本构关系,运用Sidiroff能量等价原理对损伤因子进行推导,采用数值模拟与试验研究相结合的方法分析一根钢筋混凝土简支梁,并将模拟结果与试验结果相对比。研究结果表明,模拟值曲线与试验值曲线吻合度较好,且ABAQUS分析结果中损伤云图显示出的梁受损情况与试验中观察到的破坏现象基本一致,验证了该计算公式的准确性,有利于混凝土损伤塑性模型达到理想收敛状态,为日后学者使用该模型进行混凝土结构非线性分析提供参考。

The ABAQUS concrete damaged plasticity model can be effectively used in the study on structural performance of concrete,but the real damage factors in the model are often difficult to obtain due to the limitation of test conditions,so a method of calculating the damage factors is proposed.Based on the concrete constitutive relation specified in the concrete structural design specification,the damage factors were deduced with the principle of Sidiroff energy equivalence,a reinforced concrete beam with simply supported ends was analyzed by means of combining numerical simulation and experimental research,and the simulation results were compared with the test results.The results show that the simulation value curve coincides with the experimental value curve,and the damage of beam shown in the damage cloud map in the ABAQUS analysis results is basically identical to the damage observed in the experiment,which confirms the accuracy of this calculation formula and is beneficial to the ideal convergence state of the concrete damaged plasticity model,which also provides reference for scholars to use this model for nonlinear analysis of concrete structures in the future.