基于损伤塑性模型的砌体墙体非线性有限元分析  

Nonlinear Finite Element Analysis of Masonry Wall Using Damaged Plasticity Model

作　　者：王蓓蓓[1] 董军[1] 

机构地区：[1]南京工业大学土木工程学院,南京210009

出　　处：《防灾减灾工程学报》2014年第2期216-222,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：江苏省高校自然科学研究重大项目(09KJA560001)资助

摘　　要：为了研究砌体墙体用钢结构加固后的力学性能,需要提供较准确的砌体墙体非线性计算,考虑到砌体与混凝土的材料性质具有相似性,将混凝土损伤塑性模型经修正后应用于砌体数值模拟,实现对砌体墙体的非线性有限元分析。通过与水平加载试验结果对比,验证了有限元模型的正确性。探讨了损伤塑性模型中的粘性系数、膨胀角、砌体本构关系中的初始弹性模量、受拉应力应变关系对计算结果的影响。结果表明:粘性系数和膨胀角对抗剪承载力、峰值位移及下降段性能均有较大影响,而对初始刚度影响很小;随着初始弹性模量的增大,砌体墙体抗剪承载力随之提高,但峰值位移无明显变化;受拉应力应变方程中待定系数的取值,对抗剪承载力及峰值位移影响较大。To study the mechanical properties of masonry wall strengthened with steel members, accurate nonlinear calculation methods for masonry wall must be provided.Considering similar material properties of masonry and concrete,a numerical method including the modified concrete damaged plasticity model was used for nonlinear finite element analysis of the masonry wall.The presented model was validated by comparing the computed results with experimental results.The effects of viscosity coefficient and dilation angle of damaged plasticity model,the elastic modulus as well as the tensile stress-strain relation of masonry on the computed results were investigated. The results indicate that the viscosity coefficient and dilation angle have great influence on the shear capacity,peak displacement and descending stage performance,but have little influence on the initial stiffness of the masonry wall.With the increase of initial elastic modulus,the shear capacity of the masonry wall improves obviously,but the change of peak displacement is unobvious.Both the shear capacity and peak displacement of the masonry wall are greatly influenced by the undetermined coefficient in the tensile stress-strain equation.

关 键 词：砌体墙体 损伤塑性模型 非线性分析 ABAQUS 

分 类 号：O353.1[理学—流体力学] TU81[理学—力学]