基于纖維模型的鋼混框架結(jié)構(gòu)擬靜力試驗數(shù)值模擬*
張沛洲1，歐進萍1,2
- 摘 要
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張沛洲1，歐進萍1,2(1 大連理工大學(xué)建設(shè)工程學(xué)部， 大連 116024； 2 哈爾濱工業(yè)大學(xué)土木工程學(xué)院， 哈爾濱 150090)［摘要］為分析汶川地震中鋼混框架結(jié)構(gòu)的震害機理，清華大學(xué)和中國建筑學(xué)會建筑結(jié)構(gòu)防倒塌專業(yè)委員會開展了一系列擬靜力試驗，以此為背景，基于纖維模型提出了考慮節(jié)點宏觀模型的建模方法，并采用此方法在試驗前后分別模擬了該系列試驗?；诮Y(jié)構(gòu)整體和局部信息對比了框架試驗與模擬的結(jié)果，初步探討了柱構(gòu)件試驗邊界條件的合理性。研究表明，與其他模型相比，使用纖維模型能夠更好地預(yù)測框架結(jié)構(gòu)及構(gòu)件的受力行為，尤其在考慮了節(jié)點區(qū)建模后可更準確地模擬結(jié)構(gòu)的滯回行為；對于“強節(jié)點弱構(gòu)件”類結(jié)構(gòu)，分析中可不考慮節(jié)點區(qū)建模，若梁柱節(jié)點區(qū)配箍不足，則要考慮節(jié)點區(qū)的影響，建議針對特定的問題需選取合適的建模方法。［關(guān)鍵詞］鋼筋混凝土框架結(jié)構(gòu); 數(shù)值模擬; OpenSees; 纖維模型; 梁柱節(jié)點中圖分類號：TU375.4 文獻標識碼：A 文章編號：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*國家自然科學(xué)基金項目（51261120376），“973”國家重點基礎(chǔ)研究發(fā)展計劃基金項目（2007CB714202）。作者簡介：張沛洲，博士研究生，Email: zpz_87@163.com。參考文獻［1］王亞勇. 汶川地震建筑震害啟示:抗震概念設(shè)計［J］. 建筑結(jié)構(gòu)學(xué)報, 2008, 29(4): 20-25.［2］陸新征，葉列平，潘鵬，等. 鋼筋混凝土框架結(jié)構(gòu)擬靜力倒塌試驗研究及數(shù)值模擬競賽Ⅰ:框架試驗［J］. 建筑結(jié)構(gòu), 2012, 42(11): 19-22.［3］陸新征，葉列平，潘鵬，等. 鋼筋混凝土框架結(jié)構(gòu)擬靜力倒塌試驗研究及數(shù)值模擬競賽Ⅱ:關(guān)鍵構(gòu)件試驗［J］. 建筑結(jié)構(gòu), 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］張沛洲. 多齡期鋼筋混凝土結(jié)構(gòu)抗震性能分析［D］. 大連: 大連理工大學(xué), 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］韓風(fēng)霞，王志軍，宋孟超，等. 鋼筋混凝土梁柱節(jié)點核心區(qū)拉壓桿模型化方法研究［J］. 土木建筑與環(huán)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］中國建筑學(xué)會建筑結(jié)構(gòu)防倒塌專業(yè)委員會. 鋼筋混凝土框架結(jié)構(gòu)擬靜力倒塌試驗研究及數(shù)值模擬競賽Ⅲ:模擬結(jié)果分析［J］. 建筑結(jié)構(gòu), 2012, 42(11): 27-30.［14］清華大學(xué)，西南交通大學(xué)，重慶大學(xué)，等. 汶川地震建筑震害分析及設(shè)計對策［M］. 北京:中國建筑工業(yè)出版社, 2009.
