钢框架不同构造形式焊接节点抗震性能分析
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摘要
研究节点的构造形式对于改善钢框架结构的延性、防止发生脆性破坏、提高结构的抗震能力有着重要的意义,为了系统全面地对比不同构造形式对于钢框架焊接节点抗震性能的影响以及构造形式对于节点在地震作用下的反应和破坏形态的改变作用,采用通用有限元软件ABAQUS建立非线性有限元模型,结合国内外已有的钢框架焊接节点拟静力试验,验证了建立的有限元模型对模拟局部屈曲的准确性和适用性。通过建立九种不同构造形式的节点模型,与标准节点在承载力、刚度、滞回性能、退化特性、断裂倾向指数、破坏形态以及塑性铰位置等进行对比分析,深入探讨不同构造形式节点的受力性能,为工程应用提供重要依据。分析结果表明:剪切域强弱对于节点的破坏模式有较大影响;同时考虑抗震效果、建筑要求以及经济指标,削弱型节点并没有过多的削弱节点承载能力以及刚度,并且滞回性能稳定,"狗骨头"型节点存在侧向稳定性问题,而腹板开洞型节点无论是在滞回性能还是破坏形态方面都具有较好的表现。
Structural constructions of connections play a great significant role on a steel frame structure to improve the ductility and aseismic capacity of the structure,as well as to prevent brittle failure.In order to have a systematic and comprehensive comparison among the aseismic behavior of different structural constructions of steel-frame-welded connections,an efficient and accuracy finite element model of ABAQUS is used.A non-linear finite element model is proved correct and applicable due to published steel frame connection quasi-static tests.Through establishing ten different structural construction connection models,the capacity,stiffness,hysteretic behaviour,degradation characteristics,fracture tendency index,failure modes and location of plastic hinges are compared and discussed in detail.The results show that: Shear region strength significantly affects the failure mode;considering the seismic-resistant effect,building requirements and economic indicators,the carrying capacity and stiffness of the weaken connections are not weakened too much and their hysteretic behaviours are stable;"Dog bone" type connection has a problem of lateral stability and the connection of holes in web either on the hysteretic behaviour or failure modes has a better performance.
Structural constructions of connections play a great significant role on a steel frame structure to improve the ductility and aseismic capacity of the structure,as well as to prevent brittle failure.In order to have a systematic and comprehensive comparison among the aseismic behavior of different structural constructions of steel-frame-welded connections,an efficient and accuracy finite element model of ABAQUS is used.A non-linear finite element model is proved correct and applicable due to published steel frame connection quasi-static tests.Through establishing ten different structural construction connection models,the capacity,stiffness,hysteretic behaviour,degradation characteristics,fracture tendency index,failure modes and location of plastic hinges are compared and discussed in detail.The results show that: Shear region strength significantly affects the failure mode;considering the seismic-resistant effect,building requirements and economic indicators,the carrying capacity and stiffness of the weaken connections are not weakened too much and their hysteretic behaviours are stable;"Dog bone" type connection has a problem of lateral stability and the connection of holes in web either on the hysteretic behaviour or failure modes has a better performance.
引文
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[2]王萌,石永久,施刚,王元清.高层钢框架构件与节点滞回模型及损伤退化分析[J].工业建筑,2009(增刊):973―981.Wang Meng,Shi Yongjiu,Shi Gang,Wang Yuanqing.Analysis on degraded and damage hysteretic model ofhigh-rise steel frame structures and connections[J].Industrial Construction,2009(Suppl.):973―981.(inChinese)
[3]Carlo A,Raffaele P.Failure criteria and cumulativedamage models for steel components under cyclicloading[J].Journal of Constructional Steel Research,2009,65:751―765.
[4]Krawinkler H,Zohrei M.Cumulative damage in steelstructures subjected to earthquake ground motion[J].Computers&Structures,1983,16(1/2/3/4):531―541.
[5]Krawinkler H,Zohrei M,Bahman L I,et al.Recommendations for experimental studies on theseismic behavior of steel components and materials[R].Earthquake Engineering Center,Department of Civil andEnvironmental Engineering,Stanford University,Stanford,CA.1983,No.61.
[6]王秀丽.多层钢框架梁柱连接节点抗震性能研究[D].北京:哈尔滨工业大学,2004.Wang Xiuli.Research on anti-seismic behavior ofbeam-column connections in multi-story steel frames[D].Beijing:Harbin Institute of Technology,2004.(inChinese)
[7]Li Fengxiang,Kanao Iori,Li Jun,et al.Local buckling ofRBS beams subjected to cyclic loading[J].Journal ofStructural Engineering,2009,135(12):1491―1498.
[8]Egor P,Yang T,Chang S.Design of steel MRFconnections before and after 1994 northridge earthquake[J].Engineering Structures,1998,20(12):1030―1038.
[9]陈宏.高层钢结构节点地震脆断机理及抗震性能研究[D].北京:中国矿业大学,2001.Chen Hong.Seismic brittle fracture mechanism andSeismic behavior of steel beam-column connections intall buildings[D].Beijing:China University of Miningand Technology,2001.(in Chinese)
[10]Ricles J M,Fisher J W,Lu L W,et al.Development ofimproved welded moment connections forearthquake-resistant design[J].Journal of ConstructionalSteel Research,2002,58(5/6/7/8):565―604.
[11]Cheng C,Chun C,Cheng H.Ductile momentconnections used in steel Column-tree moment-resistingframes[J].Journal of Constructional Steel Research,2006,62(8):793―801.
[12]James M R,Mao C S,Lu L W,et al.Inelastic cyclictesting of welded unreinforced moment connections[J].Journal of Structural Engineering,2002,128(4):429―440.
[13]Cheng C,Shuan W,Ming D,et al.Cyclic Behaviour ofunreinforced and rib-reinforced moment connections[J].Journal of Constructional Steel Research,2005,61(1):1―21.
[14]Lee C H,Jung J H,Oh M H,et al.Experimental study ofcyclic seismic behavior of steel moment connectionsreinforced with ribs[J].Journal of Structural Engineering,2005,131(1):108―118.
[15]Yu Q S,Uang C M,Gross J.Seismic rehabilitationdesign of steel moment connection with welded haunch[J].Journal of Structural Engineering,2000,126(1):69―78.
[16]中华人民共和国建设部.GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.Ministry of Housing and Urban-Rural Development ofthe People’s Republic of China.GB50011-2001,Codefor seismic design of buildings[S].Beijing:ChinaArchitecture&Building Press,2001.(in Chinese)
[17]邓椿森,施刚,张勇,等.高强度钢材压弯构件循环荷载作用下受力性能的有限元分析[J].建筑结构学报,2010,(增刊1):28―34.Deng Chunsen,Shi Gang,Zhang Yong,et al.Finiteelement analysis on the hysteretic behavior of highstrength steel columns under cyclic loading[J].Journalof Building Structures,2010,(Suppl.1):28―34.(inChinese)
[18]中华人民共和国建设部.GB50205-2001钢结构工程施工质量验收规范[S].北京:中国计划出版社,2001.Ministry of Housing and Urban-Rural Development ofthe People’s Republic of China.GB 50205-2001 Codefor acceptance of construction quality of steel structures[S].Beijing,China Planning Press,2001.(in Chinese)
[19]中华人民共和国建设部.JGJ101-96,建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.Ministry of Housing and Urban-Rural Development ofthe People’s Republic of China.JGJ 101-96,Specificating of testing methods for earthquake resistantbuilding[S].Beijing:China Architecture&BuildingPress,1997.(in Chinese)
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