基于能量损失理论的混凝土受压损伤本构模型

1)广东科学技术职业学院建筑工程学院,广东珠海519090; 2)深圳大学土木工程学院,广东深圳518060

混凝土; 能量损失; Najar损伤理论; 受压损伤; 本构模型; 损伤演变方程

The compression damage constitutive model of concrete based on the theory of energy loss
Xu Na1 and Fu Xueyi2

Xu Na1 and Fu Xueyi21)College of Architectural Engineering, Guangdong Polytechnic of Science and Technology, Zhuhai 519090, Guangdong Province, P.R.China2)College of Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China

concrete; energy loss; Najar damage theory; compression injury; constitutive model; damage evolution equation

DOI: 10.3724/SP.J.1249.2017.06604

备注

在Najar损伤理论基础上,基于《混凝土结构设计规范》(GB 50010—2010),提出一种新型的混凝土单轴受压损伤本构模型,得到混凝土单轴受压损伤的计算公式和演变方程,可更好地描述没有简化的混凝土单轴受压过程中的损伤状况. 给出常用强度等级的混凝土受压损伤本构曲线和损伤变量方程,对比分析不同强度等级混凝土的损伤曲线. 应用软件ABAQUS,建立一个矩形钢筋混凝土筒体剪力墙模型,绘制模型结构的极限承载力骨架曲线. 拟合对比分析,建立材料损伤和结构破坏的宏观近似关系,证明了假定是合理的. 该本构模型具有参数少、简单实用和精度较高等优点,利用此方法可以有效解决混凝土受压损伤的仿真分析.

Based on Najar damage theory, according to ‘Code for design of concrete structure'(GB50010—2010), we put forward a new generic formula of concrete compression damage constitutive model, and propose the damage evolution equation, which describes complete and non-simplified damage condition in the process of uniaxial compression of concrete preferably. For common strength grade concrete, the compression damage constitutive curve and damage variable equations are given. The concrete damage curves of different strength grades are analyzed contrastively. By using finite element software ABAQUS, we simulate the cylinder shear wall of rectangular section reinforced concrete, and draw the skeleton curve of ultimate bearing capacity under theory condition. Through fitting analysis, we establish the macro relation between materials damage and structure destruction, which verifies that the assumption is reasonable. The advantages of this constitutive model are that the parameters are less and its mathematical form is simple and practical, and that the precision is higher, which provides another solution with compression damage simulation analysis of concrete structure.

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