半刚性连接组合框架地震反应分析
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摘要
本文采用SAP2000程序建立了半刚性连接组合框架的有限元模型,基于半刚性组合节点试验所得到的滞回模型,研究了半刚性连接组合框架的地震反应特征,并分析了连接刚度变化对多层组合钢框架动力特性的影响,比较了框架中不同位置连接的耗能能力。分析结果表明,连接柔度会降低结构的低阶自振周期,但是对高阶模态影响则很小。地震作用下半刚性连接组合框架的位移反应不一定大于对应的刚接组合框架,而地震剪力则减小。框架中的边节点耗散的地震能量多于中间节点,而底层节点耗散的能量又多于中间层和顶层节点。
A FE model of semi-rigid connected composite frame is established in this paper.Based on the test hysteretic loops of the semi-rigid composite connection,the seismic response of the frames is analyzed.The effect of connections flexibility on the structural frequencies is presented.Flexibility of the connections has a relatively more pronounced effect on the lower frequencies.The seismic displacement response of the semi-rigidly connected composite frames is not always greater than that of the corresponding rigidly connected composite frames,while the seismic forces of the semi-rigidly connected composite frames induced by the seismic actions are decreased with the decreases of the stiffness of the connections.The energy dissipations of the semi-rigid composite connections in semi-rigid composite frames are different depend on their positions.The external joints dissipate more energy than the internal joints,and energy dissipated by the first-floor joints are more than that the joints located in other floors.
A FE model of semi-rigid connected composite frame is established in this paper.Based on the test hysteretic loops of the semi-rigid composite connection,the seismic response of the frames is analyzed.The effect of connections flexibility on the structural frequencies is presented.Flexibility of the connections has a relatively more pronounced effect on the lower frequencies.The seismic displacement response of the semi-rigidly connected composite frames is not always greater than that of the corresponding rigidly connected composite frames,while the seismic forces of the semi-rigidly connected composite frames induced by the seismic actions are decreased with the decreases of the stiffness of the connections.The energy dissipations of the semi-rigid composite connections in semi-rigid composite frames are different depend on their positions.The external joints dissipate more energy than the internal joints,and energy dissipated by the first-floor joints are more than that the joints located in other floors.
引文
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[6]Ammerman D J,Leon R.Unbraced frames with semi-rigidcomposite connections[J].Engineering Journal,1990,27(1):1~10
[7]GB50017-2003,钢结构设计规范[S].北京:中国建筑工业出版社,2003
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[9]王燕,苏波.半刚接钢框架的动力分析[J].力学与实践,2005,27(4):51~55
[10]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2002
[11]刘清平.水平荷载作用下半刚性连接组合框架的实用设计方法[D].同济大学博士学位论文,2006
[12]李国强,沈祖炎.半刚性连接钢框架弹塑性地震反应分析[J].同济大学学报,1992,20(2):123~128
[13]Elnashai A S,Elghazouli A Y,Denesh-Ashtiani F A.Response of semi-rigid steel frames to cyclic and earthquakeloads[J].Journal of Structural Engineering,1998,124(8):857~867
[14]Marwan N N,Astaneh-Asl Abolhassan.Shaking table testsof rigid,semi-rigid,and flexible steel frames[J].Journal ofStructural Engineering,1996,122(6):589~596
[15]Alfredo R S,Achintya H.Energy dissipation at PR framesunder seismic loading[J].Journal of StructuralEngineering,2001,127(5):588~592
[2]孙飞飞,李国强,胡凌华.梁柱组合节点的试验研究新进展[J].建筑钢结构进展,2004,6(2):37~42
[3]Nethercot D A.Semi-rigid joint action and the design ofnonsway composite frames[J].Engineering Structures,1995,17(8):554~567
[4]李杰,李国强.地震工程学导论[M].北京:地震出版社,1992
[5]石文龙.平端板连接半刚性梁柱组合节点的试验与理论研究[D].同济大学博士学位论文,2006
[6]Ammerman D J,Leon R.Unbraced frames with semi-rigidcomposite connections[J].Engineering Journal,1990,27(1):1~10
[7]GB50017-2003,钢结构设计规范[S].北京:中国建筑工业出版社,2003
[8]Monforton G R,Wu T S.Matrix analysis of semi-rigidlyconnected steel frames[J].Journal of Structural Division,1963,89(6):13~42
[9]王燕,苏波.半刚接钢框架的动力分析[J].力学与实践,2005,27(4):51~55
[10]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2002
[11]刘清平.水平荷载作用下半刚性连接组合框架的实用设计方法[D].同济大学博士学位论文,2006
[12]李国强,沈祖炎.半刚性连接钢框架弹塑性地震反应分析[J].同济大学学报,1992,20(2):123~128
[13]Elnashai A S,Elghazouli A Y,Denesh-Ashtiani F A.Response of semi-rigid steel frames to cyclic and earthquakeloads[J].Journal of Structural Engineering,1998,124(8):857~867
[14]Marwan N N,Astaneh-Asl Abolhassan.Shaking table testsof rigid,semi-rigid,and flexible steel frames[J].Journal ofStructural Engineering,1996,122(6):589~596
[15]Alfredo R S,Achintya H.Energy dissipation at PR framesunder seismic loading[J].Journal of StructuralEngineering,2001,127(5):588~592
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