循环荷载下钢筋混凝土柱非线性滞回反应数值模拟.doc

 n  循环荷载下钢筋混凝土柱非线性滞回反应 数值模拟# 蒋雯1，孙广俊1,2，李鸿晶1** 5 10 15 20 25 30 35 40 （1. 南京工业大学土木工程学院，南京 210009； 2. 东南大学混凝土及预应力混凝土结构教育部重点实验室，南京 210096） 摘要：强震中的结构倒塌是造成人员伤亡和财产损失的主要原因，如何较真实地模拟钢筋混 凝土柱在循环荷载作用下的非线性滞回反应是结构抗倒塌研究的重要内容。基于 OpenSees 平台，分别采用基于刚度理论的梁柱纤维单元和基于柔度理论的带塑性铰梁柱纤维单元建立 了钢筋混凝土柱有限元模型，对往复荷载作用下的钢筋混凝土单柱非线性滞回反应进行了数 值模拟。通过与试验结果的对比，验证分析了两种模型的数值模拟效果，并对数值模拟结果 进行了讨论。研究表明，采用纤维单元模型可以较为真实地模拟循环荷载作用下钢筋混凝土 柱的非线性滞回性能，模拟结果能够较好地反映钢筋混凝土柱在反复加载过程中刚度和强度 退化及捏拢现象，材料本构参数、积分点数目及带塑性铰梁柱纤维单元模型中的塑性铰长度 对模拟效果有着重要的影响。 关键词：结构工程；抗倒塌；钢筋混凝土柱；数值模拟；纤维单元；OpenSees 中图分类号：TU375 NUMERICAL SIMULATION ON NONLINEAR HYSTERETIC RESPONSE OF REINFORCED CONCRETE COLUMN UNDER CYCLIC LOADS JIANG Wen1, SUN Guangjun1,2, LI Hongjing1 (1. College of Civil Engineering, Nanjing University of Technology, Nanjing, 210009; 2. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096) Abstract: Collapse of structure in strong earthquakes is the main cause leading to the great economic losses and casualties. How to factually simulate the nonlinear hysteretic responses of reinforced concrete column under cyclic loads is an important content in research of structure collapse prevention. On the basis of OpenSees procedure, the reinforced concrete column finite element model is established by using displacement-based beam-column fiber element and beam with hinges fiber element respectively. The numerical simulation on nonlinear hysteretic response of reinforced concrete column under cyclic loads is performed. According to the comparing numerical results with experimental results, the effectiveness of simulation based on two different models is verified and analyzed. Furthermore, the results of numerical simulation are discussed. The research indicates that the nonlinear hysteretic characteristics of reinforced concrete column under cyclic loads can veritably simulated by using fiber element model, the numerical simulation veritably reflected the stiffness and strength d