箍筋约束混凝土单轴拉压弹塑性损伤本构模型(校对稿)

箍筋约束混凝土单轴拉压弹塑性损伤本构模型万增勇1，任晓丹1，李杰，2(1.同济大学土木工程学院，上海200092：2.同济大学土木工程防灾国家重点实验室，上海200092)摘要：以混凝土规范单轴损伤本构为基础，考虑损伤变量演化的物理意义与拉压损伤的耦合关系等因素，提出一类新的损伤演化，塑性应变的计算方法。建立了能综合考虑由箍筋约束效应造成的混凝土受压强度提高、延性的增强，由纵筋造成的混凝土受拉刚化效应的损伤本构模型。结合试验数据对新的损伤本构模型进行了参数识别，给出模型参数的计算方法。以C+为开发工具，将新的混凝土单轴拉压弹塑性损伤本构集成到OpenSees中，最后通过从强度试件到构件再到结构三个尺度的算例来验证模型的实用性与可靠性。关键词：箍筋约束混凝土：单轴损伤本构：参数识别：OpenSees二次开发中图分类号：TU313文献标志码：AUniaxial elastic-plastic damage model for confined concreteWAN Zengyong',REN Xiaodan',LI Jie2(1.College of Civil Engincering,Tongji University,Shanghai 200092,China;2.State Key Laboratory ofDisaster Reduction in CivilEngineering,Tongji University,Shanghai 200092,China)Abstract:Based on the concrete damage model in Chinese concrete structure design code,the physicalmeaning of damage evolution and the coupling of tension-compression damage are taken into consideration,a new way to calculate the evolution of damage and plastic strain is proposed.A new damage model in whichthe improvement of concrete strength and ductility due to stirrups,the tension stiffen effect due tolongitudinal reinforcement are taken into consideration is established.Afterwards,the way to calculate themodel parameters is proposed based on the experiment data.Finally,the modified damage model is added toOpenSees successfully and three examples are used to verity the practicality and reliability of this model.Key words:confined concrete;uniaxial damage model;parameter identification;OpenSees secondarydevelopment基金项目：国家自然科学基金重大国际合作项目(51261120374)，国家自然科学基金集成项目(91315301)。作者简介，万增勇(1989-)，男，四川德阳人，硕士研究生。E-mail:wanzengyong@163.com收稿日期：2014年7月