摘要
连柱钢框架体系是一种双重抗侧力无支撑框架结构,为了研究梁柱节点连接形式对连柱钢框架体系抗震性能的影响,本文采用ABAQUS有限元分析软件建立了梁柱节点焊接连接(FJ1)和腹板螺栓连接(FJ2)两种节点连接形式的连柱钢框架子结构有限元分析模型,并通过改变耗能连梁长度得到了两组试件各自的破坏模式、节点刚度、滞回曲线、骨架曲线等性能指标,对比分析了不同节点连接形式对子结构抗震性能的影响。分析结果表明:不同节点连接形式下,连柱钢框架子结构均具有良好的屈服时序和耗能能力,塑性变形均主要集中在耗能连梁上;梁柱节点仅腹板采用螺栓连接时,节点刚度、结构抗侧刚度均比梁柱节点采用焊接时小,梁柱可以发生相对转动,传递的弯矩减小,框架结构可以发生更大的变形,耗能连梁进入塑性程度高,耗散能量多;随着耗能连梁长度的增加,两种节点连接形式的结构承载力、耗能能力均逐步提高,刚度均呈现先增大后减小的趋势,建议两种节点连接形式下耗能连梁长度取值范围均为0.98M_p/V_p^1.47M_p/V_p。
The linked column steel frame system is a kind of double lateral force-resisting unsupported frame structure.In order to study hysteretic behavior of the linked column steel frame system,the finite element analysis models of the substructure of the linked column steel frame with beam-column joint welded(FJ1)and web bolted(FJ2)are established by using ABAQUS finite element analysis software.By changing the length of link beams,the failure modes,joint stiffness,hysteresis curve and skeleton curve of the two groups of specimens are obtained,and the effects of different joint forms on hysteretic behavior of substructures are compared and analyzed.The results show that the linked column steel frame substructures have good yielding time series and energy dissipation capacity under different joint forms,and the plastic deformation mainly concentrates on link beams.When only the web of beam-column joint is connected by bolts,the joint stiffness and structural lateral stiffness are smaller than when the beam-column joint is welded,the beam and column can rotate relatively,the transmitted moment is reduced,and the frame structure can deform more,but link beams have higher plasticity degree and more energy dissipation.With the increase of the length of link beams,the bearing capacity and energy dissipation capacity of the two types of joints are gradually increased,and the stiffness of the joints increases first and then decreases.It is suggested that the length of link beams in the two types of joints should be in the range of 0.98 M_p/V_p^1.47 M_p/V_p.
作者
熊雅静
赵宝成
Xiong Ya-jing;Zhao Bao-cheng(Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)
出处
《工程抗震与加固改造》
北大核心
2020年第5期7-16,45,共11页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(51878432)
江苏省高校自然科学研究重大项目(15KJA560002)。
关键词
连柱钢框架
耗能连梁
梁柱连接节点
滞回性能
linked column steel frame
link beam
beam-column joint
hysteretic behavior
