偏心支撑半刚接钢框架的模态分析
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摘要
将偏心支撑与半刚接钢框架相结合,是一种新型的框架支撑体系。偏心支撑可以弥补半刚接钢框架的刚度不足,同时又不降低其延性和耗能能力。运用ANSYS有限元分析软件,建立了4榀6层的半刚接钢框架(1榀框架无偏心支撑,3榀框架有偏心支撑)有限元模型,对框架试件进行模态分析。研究节点初始刚度、支撑条件等因素对框架自振周期的影响。根据分析得出:偏心支撑半刚接钢框架的刚度主要由支撑提供,梁柱的半刚性连接对结构的自振周期无显著影响。在相同参数下,支撑类型对结构自振周期有影响。
There formed a new type of braced resistant steel frame,which combined eccentrically braces and steel frames with semi-rigid connections.Eccentrically braces increase the lateral stiffness of steel frames with semi-rigid connections and meanwhile maintain its ductility and energy dissipations.ANSYS was employed to model semi-rigid steel frames with four different support types.Modal analysis of the frames was studied to investigate the dynamic property of eccentrically braced semi-rigid steel frames,which was influenced by rotational stiffness of connections,eccentrically braced type and so on.It is concluded that the stiffness of eccentrically braced semi-rigid steel frames is supported mainly by the supports.The semi-rigid connection has no significant effect on the natural cycle.The types of eccentrically braced have effect in the same parameters.
There formed a new type of braced resistant steel frame,which combined eccentrically braces and steel frames with semi-rigid connections.Eccentrically braces increase the lateral stiffness of steel frames with semi-rigid connections and meanwhile maintain its ductility and energy dissipations.ANSYS was employed to model semi-rigid steel frames with four different support types.Modal analysis of the frames was studied to investigate the dynamic property of eccentrically braced semi-rigid steel frames,which was influenced by rotational stiffness of connections,eccentrically braced type and so on.It is concluded that the stiffness of eccentrically braced semi-rigid steel frames is supported mainly by the supports.The semi-rigid connection has no significant effect on the natural cycle.The types of eccentrically braced have effect in the same parameters.
引文
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[14]邵建华,申永康.高层钢框架-支撑结构动力特性分析[J].江西科学,2006,24(4):181-183.
[15]郭兵,柳锋,顾强.梁柱端板连接的破坏模式及弯矩转角关系[J].土木工程学报,2002,35(5):24-27.
[2]陈爱国.钢框架腹板双角钢抗剪连接在循环荷载作用下的破坏机理及抗震设计对策[D].西安:西安建筑科技大学,2002.
[3]TSAI KEN-CHYUAN,POPOV E P.Cyclic behavior of end-plate moment connections[J].Journal Structural Engineering,ASCE,1990,116(11):2917-2930.
[4]ASTANESH-ALS A,NADERM N.Seismic behavior and design of semi-rigid structures[C]//Proc.,Ist.Int.Workshop and Seminar on Behavior of Steel Structures in Seismic Areas(STESSA’94),Elsevier,London,England,1994.
[5]NADER M N,ASTANEH-ASL.A shaking table test of rigid,semi-rigid,and flexible steel frames[J].Journal of Structural Engineering,ASCE,1996,122(6):589-596.
[6]W S ZHANG,Y L XU.Dynamic characteristic and seismic response of semi-rigid jointed frames[J].Advances in Steel Structures,2000,11.
[7]孙修礼,梁书亭,王群依,等.半刚性连接框架结构的动力特性研究[J].工程抗震与加固改造,2005,27(1):16-18.
[8]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.
[9]郭兵,郭彦林,柳锋,等.焊接及螺栓连接钢框架的循环加载试验研究[J].建筑结构学报,2006,27(2):47-56.
[10]郭兵,郭彦林,李光明.半刚接钢框架的动力特性探讨[J].建筑结构,2007,37(10):109-111.
[11]KAWASHIMA S,FUJMOTO T.Vibration analysis of frames with semi-rigid connections[J].Computer&Structures,1984,19(1-2):85-92.
[12]于安麟.EK型、Y型支撑的抗震性能研究[J].西安冶金建筑学院学报,1990,12(3).
[13]钱稼茹,陈茂盛.偏心支撑钢框架拟动力地震反应试验研究[J].工程抗震,1992(1):15-19.
[14]邵建华,申永康.高层钢框架-支撑结构动力特性分析[J].江西科学,2006,24(4):181-183.
[15]郭兵,柳锋,顾强.梁柱端板连接的破坏模式及弯矩转角关系[J].土木工程学报,2002,35(5):24-27.
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