扩高比对蜂窝框架抗震性能的影响
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摘要
研究不同扩高比对蜂窝钢框架抗震性能的影响。以蜂窝式钢框架结构抗震性能试验为基础,利用有限元软件建立合理的有限元模型。对开孔形式相同的蜂窝梁采用不同腹板扩高比框架结构,并模拟低周反复荷载作用下的受力过程和破坏形式。得到了不同扩高比下蜂窝钢框架的滞回曲线、骨架曲线、刚度退化、延性等性能,并进行对比与分析。结果表明:开孔形式相同时,与扩高前实腹框架相比,扩高比为1.3～1.5时蜂窝梁框架结构均有较好的抗震性能;扩高比为1.6、1.7时,抗震性能下降,在钢框架设计中建议使用扩高比不大于1.5的蜂窝框架梁。
It is researched the impact of the different expansion ratio on the cellular steel frame seismic performance. Based on the testing of cellular steel frame seismic performance, reasonable finite element model is established by using the finite element software. Through the different expansion ratio frame structure using the same opening form, the stress process and failure modes under low cyclic reverse load are simulated, thus getting the hysteretic curve, skeleton curves, stiffness degradation, ductility and other behavior of the framework, which are contrasted and analysed. The results show that with the same openings form of cellular steel frame structure, compared to the unexpanded solid-web frame, when the expansion ratio is 1.3~1.5, the seismic performance is better ; when the expansion ratio is 1.6 and 1.7, seismic performance is decreased. So, the expansion ratio not more than 1.5 of cellular steel frame beam is recommended in the design of steel frame.
It is researched the impact of the different expansion ratio on the cellular steel frame seismic performance. Based on the testing of cellular steel frame seismic performance, reasonable finite element model is established by using the finite element software. Through the different expansion ratio frame structure using the same opening form, the stress process and failure modes under low cyclic reverse load are simulated, thus getting the hysteretic curve, skeleton curves, stiffness degradation, ductility and other behavior of the framework, which are contrasted and analysed. The results show that with the same openings form of cellular steel frame structure, compared to the unexpanded solid-web frame, when the expansion ratio is 1.3~1.5, the seismic performance is better ; when the expansion ratio is 1.6 and 1.7, seismic performance is decreased. So, the expansion ratio not more than 1.5 of cellular steel frame beam is recommended in the design of steel frame.
引文
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[2]Popov E P.Design of Steel MRF Connections Before and After1994Northridge Earthquake[J].Engineering Structures,1998,20(1):1030-1038.
[3]Knowles P R.Castellated Beams[J].Proeeedings of the Insti-titio of Civil Engineers,1991(1):521-530.
[4]Zaarour W,Richard,Redwood.Web Buckling in Thin Webbed Castellated Beams[J].Journal of Structural Engi-neering,1996,3(1):860-866.
[5]H Zhaoxin,T Qingxuan,W Mingchao.FEM Analysis of O-verall Stability Bearing Capacity of Simply Supported Castellat-ed Beam[C]//8th Pacific Structural Steel Conference-Steel Structures in Natural Hazards.New Zealand:2007.
[6]Sweedan A M,El-Sawy K M,Martini M I.Identification of the Buckling Capacity of Axially Loaded Cellular Columns[J].Thin-Walled Structures,2009,47(4):442-454.
[7]王庆利,张淑清.空腹受弯钢构件板件设计的若干问题研究[J].沈阳建筑工程学院学报,2004,20(1):17-19.
[8]王频,李小明,卞晓芳,等.蜂窝梁的强度设计及试验对比[J].钢结构,2010,25(10):14-17.
[9]贾连光,耿琳.蜂窝式压弯构件弯矩作用平面内稳定承载力计算的试验验证[J].沈阳建筑大学学报,2005,21(3):195-199.
[10]孙宏达.蜂窝式梁-柱钢框架结构抗震性能分析[D].沈阳:沈阳建筑大学,2011.
[11]黄炳生,舒赣平.低周反复荷载下两跨两层轻钢框架抗震性能试验研究[J].地震工程与工程振动,2006,26(6):114-119.
[12]贾连光,许峰,张绍武.轻型钢框架结构的抗震性能试验研究[J].工业建筑,2005,35(10):64-68.
[13]Kato B,Chen W F,Nakao M.Effects of Joint-Panel Shear De-formation on Frames[J].Journal of Constructional Steel Re-search,1988,10(1):163-174.
[14]陆铁坚,贺子瑛,余志武,等.钢-混凝土组合梁与混凝土柱节点的抗震性能试验研究[J].建筑结构学报,2008,29(1):70-74.
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