地震荷载下双腹板-顶底角钢连接半刚接钢框架的动力特性研究
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摘要
利用大型有限元分析软件ANSYS对双腹板、顶底角钢半刚性连接的钢框架进行了三维弹塑性动力有限元分析。该分析采用了有限元实体建模,考虑了钢框架连接节点的非线性、几何非线性以及材料非线性等因素。通过有限元数值模拟分析得出了在地震荷载作用下,半刚性节点刚度的变化对钢框架的基本自振周期、楼层剪力、楼层位移、楼层加速度和节点的弯矩-转角关系的影响规律,并将部分数值模拟分析结果与拟动力试验结果进行对比,发现这两种研究方法所得结果基本一致。通过该文的分析,得出了节点刚度的变化对结构动力特性影响的一般规律,为今后高层钢结构设计和钢结构规范的修改提供了一定的理论依据。
Based on ANSYS finite element software,the performance of connections and the nonlinearities of geometry and material are considered,and the nonlinear finite element analysis of a steel frame with semi-rigid connections of top and seat angles with double web angles is conducted.The natural period of vibration,shear forces,displacements,accelerations of floors as well as the hysteresis loops of the steel-frame semi-rigid connection are obtained.The numerical results are compared with pseudo-dynamic experimental results,they are consistent well each other.The influence of semi-rigid connection's flexibility on the steel frame is also explored,which provides some references for the design of a steel frame with semi-rigid connections and the amendment of the specification of the Steel structure in the future.
Based on ANSYS finite element software,the performance of connections and the nonlinearities of geometry and material are considered,and the nonlinear finite element analysis of a steel frame with semi-rigid connections of top and seat angles with double web angles is conducted.The natural period of vibration,shear forces,displacements,accelerations of floors as well as the hysteresis loops of the steel-frame semi-rigid connection are obtained.The numerical results are compared with pseudo-dynamic experimental results,they are consistent well each other.The influence of semi-rigid connection's flexibility on the steel frame is also explored,which provides some references for the design of a steel frame with semi-rigid connections and the amendment of the specification of the Steel structure in the future.
引文
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[3]Choudhury D,Nimbalkar S.Seismic rotationaldisplacement of gravity walls pseudo-dynamic method:passive case[J].Soil.Dyn.Earthquake Eng,2008(3):242―249.
[4]Lignos D G,Krawinkler H,Whittaker A.Shake tablecollapse tests of a 4-story moment resisting steel frame[C].The 14th World Conference on EarthquakeEngineering.Beijing,2008:12―17.
[5]Fu Feng,Lam Dennis,Ye Jianqiao.Parametric study ofsemi-rigid composite connections with 3-D finiteelement approach[J].Engineering Structures,2007,29(6):888―898.
[6]完海鹰,王建国,王秀喜.半刚性连接钢框架的拟动力实验研究[J].实验力学,2009,24(4):125―136.Wan Haiying,Wang Jianguo,Wang Xiuxi.Thepseudo-dynamic test of the semi-rigid connectionoverall steel frame[J].Journal of ExperimentalMechanics,2009,24(4):125―136.(in Chinese)
[7]JGJ101-96,建筑抗震实验方法规程[S].北京:中国建筑工业出版社,1997.JGJ101-96,Building seismic experimental methods[S].Beijing:China Architecture Building Press,1997.(inChinese)
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[9]宗周红,林东欣,邱法维.钢管混凝土组合框架结构拟动力抗震性能试验研究[J].建筑结构学报,2002,23(2):55―58.Zong Zhouhong,Lin Dongxin,Qiu Fawei.Experimentalresearch on seismic behavior of a concrete filled steeltubular composite frame[J].Journal of BuildingStructures,2002,23(2):55―58.(in Chinese)
[10]张波,盛和泰.ANSYS有限元数值分析原理与工程应用[M].北京:清华大学出版社,2005.Zhang Bo,Sheng Hetai.ANSYS finite elementnumerical analysis theory and engineering application[M].Beijing:Tsinghua University Press,2005.(inChinese)
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