基于纤维模型的钢混框架结构拟静力试验数值模拟*
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张沛洲1，欧进萍1,2(1 大连理工大学建设工程学部， 大连 116024； 2 哈尔滨工业大学土木工程学院， 哈尔滨 150090)［摘要］为分析汶川地震中钢混框架结构的震害机理，清华大学和中国建筑学会建筑结构防倒塌专业委员会开展了一系列拟静力试验，以此为背景，基于纤维模型提出了考虑节点宏观模型的建模方法，并采用此方法在试验前后分别模拟了该系列试验。基于结构整体和局部信息对比了框架试验与模拟的结果，初步探讨了柱构件试验边界条件的合理性。研究表明，与其他模型相比，使用纤维模型能够更好地预测框架结构及构件的受力行为，尤其在考虑了节点区建模后可更准确地模拟结构的滞回行为；对于“强节点弱构件”类结构，分析中可不考虑节点区建模，若梁柱节点区配箍不足，则要考虑节点区的影响，建议针对特定的问题需选取合适的建模方法。［关键词］钢筋混凝土框架结构; 数值模拟; OpenSees; 纤维模型; 梁柱节点中图分类号：TU375.4 文献标识码：A 文章编号：1002-848X(2013)18-0064-06Numerical simulation for pseudo-static test of RC frame structure based on the fiber modelZhang Peizhou1, Ou Jinping1,2(1 Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China; 2 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)Abstract: In order to analyze the seismic damage mechanism of reinforced concrete (RC) frame structures damaged during the Wenchuan Earthquake, a series of pseudo-static tests of RC frame structure were carried out by Tsinghua University and Professional Committee of Collapseprevention of Building Structure, Architectural Society of China. Based on these experiments, a structural modeling method based on fiber model and joint macro model was developed to predict mechanical behaviors of the frame before and after the experiments. Then the simulation results were compared with the test results from the global and local levels. Finally, the reasonability of the boundary conditions of RC column tests was discussed. Research shows that fiber models can predict the mechanical behaviors of the RC structures and their components much better than other models, and it can better illustrate the hysteretic behavior of structures when considering the joint modeling. For structures as “strong connections and weak members”, joint modeling isn’t necessary except for structures with poor shear capacity in joints. It is proposed to select appropriate modeling methods under the specific condition.Keywords: RC frame structure; numerical simulation; OpenSees; fiber model; beam column joint*国家自然科学基金项目（51261120376），“973”国家重点基础研究发展计划基金项目（2007CB714202）。作者简介：张沛洲，博士研究生，Email: zpz_87@163.com。参考文献［1］王亚勇. 汶川地震建筑震害启示:抗震概念设计［J］. 建筑结构学报, 2008, 29(4): 20-25.［2］陆新征，叶列平，潘鹏，等. 钢筋混凝土框架结构拟静力倒塌试验研究及数值模拟竞赛Ⅰ:框架试验［J］. 建筑结构, 2012, 42(11): 19-22.［3］陆新征，叶列平，潘鹏，等. 钢筋混凝土框架结构拟静力倒塌试验研究及数值模拟竞赛Ⅱ:关键构件试验［J］. 建筑结构, 2012, 42(11): 23-26.［4］MCKENNA F. OpenSees: A Framework for earthquake engineering simulation［J］. Computing in Science and Engineering, 2011, 13(4): 58-66.［5］MAZZONI S, MCKENNA F, SCOTT M H, et al. OpenSees users manual［R］. PEER, University of California, Berkeley, 2004.［6］MITRA N. An analytical study of reinforced concrete beam-column joint behavior under seismic loading［D］. Seattle :University of Washington, 2007.［7］LOWES L N, ALTOONTASH A. Modeling reinforcedconcrete beam-column joints subjected to cyclic loading［J］. Journal of Structural Engineering, 2003, 129(12): 1686-1697.［8］GHANNOUM W M. Experimental and analytical dynamic collapse study of a reinforced concrete frame with light transverse reinforcement［D］. Berkeley: University of California, 2007.［9］张沛洲. 多龄期钢筋混凝土结构抗震性能分析［D］. 大连: 大连理工大学, 2012.［10］LOWES L N, MITRA N, ALTOONTASH A. A beam-column joint model for simulating the earthquake response of reinforced concrete frames［R］. PEER Report, Pacific Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley, 2003.［11］韩风霞，王志军，宋孟超，等. 钢筋混凝土梁柱节点核心区拉压杆模型化方法研究［J］. 土木建筑与环境工程, 2010, 32(1): 61-65.［12］MANDER J B, PRIESTLEY M J N, PARK R. Theoretical stress-strain model for confined concrete［J］. Journal of Structural Engineering, 1988, 114(8): 1804-1826.［13］中国建筑学会建筑结构防倒塌专业委员会. 钢筋混凝土框架结构拟静力倒塌试验研究及数值模拟竞赛Ⅲ:模拟结果分析［J］. 建筑结构, 2012, 42(11): 27-30.［14］清华大学，西南交通大学，重庆大学，等. 汶川地震建筑震害分析及设计对策［M］. 北京:中国建筑工业出版社, 2009.
