分析钢筋混凝土结构的有限元程序设计

Finite Element Program Design of Reinforced Concrete Structures Analysis

提出了一个简单的混凝土三维本构模型,基于塑性流动理论,混凝土的非线性受压特性通过屈服条件、流动和硬化规则描述.编制了钢筋混凝土结构非线性分析8节点和20节点的三维等参单元程序.程序中钢筋分别采用分离与分布模式模拟.通过三个经典的算例对比分析,表明了提出的混凝土本构模型能够有效地模拟结构的破坏荷载和破坏全过程.

A simple three - dimensional constitutive relation for concrete is presented. Based on the flow theory of plasticity, the nonlinear compressive behaviour of concrete is characterized by the yield condition, the flow and hardening rules. A program which can analyze nonlinear properties of reinforced concrete structures under three - dimension stress conditions is written and the elements are the 8 - node and 20 - node isoparametrie ones. Two models of reninforcing bar, being seperated and distributive, are considered in the program. Compared with three classical examples of concrete structures, the numerical examples show that the eollapse loads and the failure performance of structure can be effectually simulated by the present constitutive relation for concrete.