钢筋混凝土三维非线性有限元分析的复合式模型

本文简要介绍了钢筋混凝土有限元传统模型，提出了三维钢筋混凝土结构非线性有限元分析复合式模型．该模型用不同方法处理计算钢筋混凝土拉区和压区：拉区钢筋采用杆件单元模型，压区钢筋混凝土则采用整体式模型．同时，引人了混凝土非线性本构关系和多轴强度准则．该模型可以适用于大型复杂钢筋混凝土结构的三维非线性有限元分析，并可以进一步实现应力应变全过程、混凝土裂缝等分析，且使用方便．所附算例表明，使用该模型能较好符合试验结果．

The Composite Model of Reinforcement Concrete on Three Dimensions Nonlinear Finite Element Analysis

The traditional finite models of reinforced concrete are introduced in this paper,and the three dimensions nonlinear finite element composite model of reinforcement concrete is put forward.This model transacts and calculates pull and press section of reinforcement concrete by different methods: the reinforcing steel bar element model is adopted at pull section and the reinforced concrete enblock model is adopted at press section .At the same time, the concrete nonlinear constitutive relation and multiaxial intensity criterion are adopted. This model can be the same with the three dimensions nonlinear finite element analysis of large and complex reinforced concrete structures conveniently, and it can carry out the analysis of stress -strain full process and concrete cracks. The calculating example indicates that it can accord with test result preferably using this model.