双肢冷弯C型钢门式刚架节点抗震性能研究
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摘要
针对双肢冷弯C型钢门式刚架梁柱节点建立ANSYS有限元模型,并进行循环加载计算,提取了节点的应力云图、M-θ滞回曲线和骨架曲线等;考察了该类节点的破坏形态、极限承载力、初始刚度、刚度退化、延性和耗能等方面的性能,探讨了多种因素对节点抗震性能的影响,并对此类节点的抗震性能做出评价,给出设计建议。研究发现:该类节点的破坏形态有节点板弯扭屈曲和梁C型钢弯曲屈曲两种;节点板厚度、螺栓间距、C型钢厚度、腹板高度和屋面坡度的增大可以不同程度地提高节点的承载力和初始刚度,而螺栓直径和翼缘宽度对其影响很小;发生梁C型钢弯曲屈曲的节点较发生节点板弯扭屈曲的节点延性和耗能性能好,符合抗震设计要求。
Beam-column joints of double C steel portal frame subjected to cyclic loading are analyzed with finite element method. The stress nephograms,M- θ hysteresis curves and skeleton curves are used to study the failure modes,ultimate bearing capacity,initial rigidity,rigidity degradation,ductility and energy dissipation. The parameter influences are discussed to evaluate the anti-seismic behavior of the joints,and some design suggestions are given. The results show that this joint has two failure modes,i. e.,the beam flexural buckling and the gusset plate flexural-torsional buckling. The ultimate bearing capacity and initial rigidity are improved in different degree with the increase of gusset plate thickness,bolt pitch,C steel thickness,web height and roof pitch. Bolt diameter and flange width have little influences. The ductility and energy dissipation of the joints with the beam flexural buckling are better than those with the gusset plate flexural-torsional buckling,which is conforms to anti-seismic requirement.
Beam-column joints of double C steel portal frame subjected to cyclic loading are analyzed with finite element method. The stress nephograms,M- θ hysteresis curves and skeleton curves are used to study the failure modes,ultimate bearing capacity,initial rigidity,rigidity degradation,ductility and energy dissipation. The parameter influences are discussed to evaluate the anti-seismic behavior of the joints,and some design suggestions are given. The results show that this joint has two failure modes,i. e.,the beam flexural buckling and the gusset plate flexural-torsional buckling. The ultimate bearing capacity and initial rigidity are improved in different degree with the increase of gusset plate thickness,bolt pitch,C steel thickness,web height and roof pitch. Bolt diameter and flange width have little influences. The ductility and energy dissipation of the joints with the beam flexural buckling are better than those with the gusset plate flexural-torsional buckling,which is conforms to anti-seismic requirement.
引文
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[2]周绪红,石宇,王瑞成,等.适合地震灾区快速重建的冷弯薄壁型钢结构住宅体系[R].汶川地震建筑震害调查与灾后重建分析报告,2008,18(68):442~447Zhou Xu-hong,Shi Yu,Wang Rui-cheng,et al.Coldformed Steel Structure Residential System Fit for Fast Reconstruction of Earthquake Stricken Areas[R].Building Earthquake Damage Investigation of Wenchuan and Earthquake Reconstruction Analysis Report,2008,18(68):442~447(in Chinese)
[3]Dundu M,Kemp A R.Strength Requirements of Single Cold-formed Channels Connected Back-to-back[J].Journal of Constructional Steel Research,2006,62(3):250~261
[4]Chung K F,Lawson R M.Structural Performance of Shear Resisting Connections between Cold-formed Steel Sections Using Web Cleats of Cold-formed Steel Strip[J].Engineering Structures,2000,22(10):1350~1366
[5]Yu W K,Wong M F,Chung K F.Analysis of Bolted Moment Connections in Cold-formed Steel Beam-column Sub-frames[J].Journal of Constructional Steel Research,2005,61(9):1332~1352
[6]Wong M F,Chung K F.Structural Behaviour of Bolted Moment Connections in Cold-formed Steel beam-column Sub-frames[J].Journal of Constructional Steel Research,2002,58(2):253~274
[7]赵根田,高鹏,马常宏.冷弯型钢抗弯斜节点抗震性能试验研究[J].内蒙古科技大学学报,2009,28(3):238~243Zhao Gen-tian,Gao Peng,Ma Chang-hong.Experimental Study on Seismic Behavior of Inclined Moment Connection between Cold-formed Beam-column Joints[J].Journal of Inner Mongolia University of Science and Technology,2009,28(3):238~243(in Chinese)
[8]JGJ227-2011,低层冷弯薄壁型钢房屋建筑技术规程[S]JGJ227-2011,Technical Specification for Low-Rise Cold-Formed Thin-Walled Steel Building[S](in Chinese)
[9]林文玉.高强度螺栓连接高温力学性能有限元分析[D].武汉:武汉理工大学,2006Lin Wen-yu.Finite Element Analysis of High Temperature Mechanical Properties of High Strength Bolt Connection[D].Wuhan:Wuhan University of Technology,2006(in Chinese)
[10]JGJ101-96,建筑抗震试验方法规程[S]JGJ10-96,Specificating of Testing Methods for Earthquake Resistant Building[S](in Chinese)
[11]张琳.半刚性钢管混凝土框架端板连接节点的抗震性能试验与理论研究[D].合肥:合肥工业大学,2012Zhang Lin.Seismic Experiments and Theoretical Studies on Endplate Joints for Semi-rigid Frames to Concrete Filled Steel Tubular Columns[D].Hefei:Hefei University of Technology,2012(in Chinese)
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