摘要
提出了一个循环荷载下考虑钢筋屈曲影响的应力应变关系模型,并在通用商业有限元平台ABAQUS中完成该材料模型的二次开发以便于工程设计应用.模型由钢筋拉压包络曲线和循环路径组成,其中,钢筋受拉包络曲线由弹性和线性硬化两个区域组成;受压包络曲线由线性弹性和随后包含非线性屈曲效应的两部分组成;循环部分遵循Ramberg-Osgood公式,但对受压循环作了一些修正以便考虑屈曲效应.而完整的钢筋循环本构模型通过结合拉压包络曲线和循环曲线获得.通过1个钢筋和3个具有不同钢筋长细比的钢筋混凝土结构模拟结果与试验结果的对比发现,所提出的模型能够合理地预示钢筋屈曲或未屈曲情况下钢筋混凝土结构的循环性能.
A formulation of a cyclic stress-strain relationship of reinforcing bars is presented.The formulation includes bars buckling.For the sake of easy use in engineering design,a finite element program based on ABAQUS has been developed.The model is comprised of a tension/compression envelope and cyclic loops.The tension envelope contains an elastic range and a linear hardening zone.The compression envelope also includes a linear elastic range followed by a nonlinear buckling model.The cyclic loops follow Ramberg-Osgood formulations with some modifications to account for the effect of buckling.A complete path-dependent cyclic constitutive model is then obtained by combining the equations representing the two monotonic envelopes and the cyclic loops.Comparison with one bar and three RC structural test results shows that the proposed model could reasonably predict the cyclic behavior of reinforced concrete structures including or excluding bar buckling.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2016年第2期254-258,共5页
Engineering Journal of Wuhan University
基金
国家自然科学基金项目(编号:51378313)
深圳市基础研究计划项目(编号:JCYJ2012061408545232)
