RC梁正截面承载力试验的计算机模拟

Exploration and practice of teching methods on bending failure of RC beam

钢筋混凝土梁正截面破坏过程是一个多阶段的非线性过程。传统的纯弯试验是一种间接的测试方法,不能直观反映梁截面内部的应力应变过程;而且受试验条件限制,通常只能进行适筋梁的试验,不能对少筋梁和超筋梁进行荷载试验。基于平截面假定,采用MATLAB程序编写了梁的正截面弯矩—曲率关系曲线计算程序。通过程序,可更直接地描述混凝土梁的受弯破坏过程,且可以模拟多种配筋条件。

Bending destroying of the reinforced concrete beam is a multistage nonlinear process. There is only adequately reinforced concrete beam in ordinary experiment for demonstrate, the experiments of overreinforced and under reinforced beam arc limited. In this paper,the M - φ curve of rectangle reinfored concrete beam was determined by finite element method based on plane section assumption. The computational program is developed by MATLAB. The relationship between loading and rotation, strain and stress were more intelligibly illustrated by calculated curve than experiment. The additional advantage of this program is that it can simulate any reinforcement condition of the concrete beam with few cost.