钢筋混凝土结构破裂过程的数值模拟

用材料破裂过程分析系统MFPA2D对钢筋混凝土桥墩在偏心加载条件下裂纹的形成和扩展进行数值模拟·计算机模拟给出了试件的载荷加载步曲线和混凝土试件破坏过程的应力分布图及弹性模量图·最后,对试件的破坏过程进行了分析,研究表明,拉应力是裂纹扩展的动力,钢筋增强了混凝土的强度·模拟结果与实验结果很吻合·为钢筋混凝土构件的设计提供了一种新的理论方法和数值分析工具·

Numerical Simulation of Crack Development in Reinforced Concrete Structures

A numerical code MFPA (Material Failure Process Analysis) is used to model the crack initiation and propagation in reinforced concrete bridge pier, which are subjected to eccentric loading. Mathematically, the MFPA code is a linear finite element method (FEM) also a continuum mechanics method for numerically processing non-linear and discontinuum problems. Reinforced concrete structures are generally designed to allow cracking under service loading. Therefore, accurate modeling is important. The reinforced concrete here is expressed by a set of elements which are of the same size but different mechanically so as to reflect its heterogeneous mechanical properties. Load-displacement curve, elastic modulus and principal stress photos are provided to simulate the failure process, and an analysis is made for the failure process. The simulation results showed that tensile stress causes the failure, which is similar to the experimental result as showed by some literatures as references.