钢筋砼梁非线性平面有限元分析

为了确保计算稳定性和提高计算精度,本文改进了砼梁单元在双向应力作用下的本构关系,自编了钢筋砼梁非线性平面有限元计算程序RCNFEA,对简支梁和两跨连续梁进行了非线性全过程分析,着重研究了连续梁的内力重分布规律,并详细分析了弯矩调幅对低配筋连续梁使用阶段裂缝宽度和挠度的影响,所得结果与试验分析结果基本一致。

The 2-D Finite Element Nonlinear Analysis for R.C Beams

In this paper, the biaxial stress-strain relations for concrete in R.C beams arc modified to secure the stability and high precision of the calculating program. Consequently, a 2 -D nonlinear finite clement program RCNFEA for R.C beams is developed. The program is applied to the full -range nonlinear analysis of R.C simple supported beams and two-span continuous beams. The regularity of redistribution of internal forces of continuous beams with moment modulation is studied, and the moment modulation influence on the crack width and the deflection of continuous reinforced concrete beams with a relatively small steel ratio under service loads is analyzed in detail. The conclusions obtained show no difference, on the whole, with the experimental ones.