一种新的循环荷载作用下考虑损伤累积应力应变关系*
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（北京交通大学土木建筑工程学院，北京 100044）[摘要]基于Menegotto ＆Pinto模型，推导了钢材在循环荷载作用下考虑损伤累积的应力应变关系。通过引入一个新的关于损伤变量的折线形函数来表示荷载作用下损伤与应力的衰减的关系，同时考虑了卸载效应对应力应变关系的影响。经与实验对比，该模型与实验结果吻合较好。该方法简单易用，为后续分析地震荷载作用下的滞回反映提供了方便。[关键词]应力应变关系;损伤累积;循环荷载;塑性应变中图分类号：TU318 文献标识码：A 文章编号：1002-848X(2013)S1-0453-03Stress-strain relationship considering damageaccumulation for steel under cyclic loadingsFan Baofeng, Yang Na, Yang Qingshan(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044，China)Abstract：The new stress-strain relationship considering damage accumulation and the effects of unloading in steel under cyclic loadings based on the Menegotto and Pinto model was proposed in this paper. It gives easy method to describe the relationship between the decrease of stress and the damage index through introducing a fold line function of damage index. Comparison between experimental data and numerical simulation in general shows good agreement. It is simple and convenient to be applied in the finite element development in the subsequent work, especially, used in the hysteretic analysis under seismic loadings.Keywords：stress-strain relationship； damage accumulation；cyclic loading；plastic strain.
