基于损伤塑性模型的无腹筋简支梁的非线性分析

Nonlinear finite element analysis of simply supported beam without web reinforcement based on damaged plasticity model

以剪跨比为1.5的无腹筋简支梁受剪性能试验研究为基础,采用有限元软件ABAQUS建立了无腹筋简支梁受剪的损伤塑性有限元模型,模拟构件加载的全过程和破坏过程、混凝土开裂等形态下构件的受力性能。模型中考虑了材料非线性和混凝土的损伤等。计算结果与试验吻合良好,通过调整混凝土损伤塑性模型的参数,探讨了损伤模型参数对计算结果的影响等问题。分析结果表明:损伤塑性模型模拟混凝土材料的非线性本构关系是行之有效的。为进一步利用ABAQUS对钢筋混凝土进行损伤塑性有限元分析提供了参考。

The concrete damaged plasticity theory and the definition and calculation of damaging factors are presented. Based on the experimental investigation of the performance in sheer on a non-web reinforcement free beam with a shear span ratio of 1 . 5 , the damage plasticity finite element model for an free beam without web reinforcement is established with ABAQUS. In the model, material nonlinearity and the damage of con-crete are taken into consideration. The calculation is in good agreement with the experimental investigation. By the adjustment of the factors in the damage plasticity model, the impact of the factors on the calculation as well as other problems is discussed. The analysis indicates that it is effective in practice when the damage plasticity model is used to simulate the constitutive relation of concrete material, which provides reference for further finite element analysis of reinforced concrete based on ABAQUS.