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.
出处
《工程抗震与加固改造》
北大核心
2015年第2期83-89,82,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(51368043)
关键词
双肢冷弯C型钢
节点
抗震性能
有限元分析
因素分析
cold-formed double C steel
joint
anti-seismic behavior
finite element analysis
parameter analysis
