节点域尺寸对H型钢局部框架极限承载力的影响  

Influence of the panel zone size on the ultimate bearing capacity for H-shaped steel frame

作　　者：包恩和[1] 王天成 陈慕杰 

机构地区：[1]桂林理工大学土木与建筑工程学院,桂林541004 [2]广西大学土木建筑工程学院,南宁530004 [3]桂林师范高等专科学校,桂林541001

出　　处：《应用力学学报》2018年第4期868-874,共7页Chinese Journal of Applied Mechanics

基　　金：广西科技计划项目(2011GXNSFC018004);桂林理工大学科研项目(2401003307)

摘　　要：为了研究节点域尺寸对H型钢截面钢框架极限承载力的影响,以常见的梁、柱、节点域组成的十字形钢框架结构为分析对象,以柱轴压比、结构跨高比、节点域高宽比、节点域宽度与钢框架层高比等为主要研究参量,基于力学平衡准则进行分析。结果表明:考虑节点域尺寸的分析模型极限承载力比值曲线可分三类,第一类曲线的节点域形成塑性铰;第二类曲线在强柱系数Rpcb≤1.2时节点域形成塑性铰,当强柱系数Rpcb>1.2时梁端形成塑性铰;第三类曲线在强柱系数Rpcb≤0.8时节点域形成塑性铰,当强柱系数Rpcb>0.8时梁端形成塑性铰。H型钢局部框架模型的极限承载力比值曲线主要为第一类曲线,不考虑节点域尺寸的模型极限承载力为考虑节点域尺寸的模型极限承载力的1~5倍,按不考虑节点域尺寸计算H型钢截面钢框架的极限承载力时可能发生过大估算,从而导致结构设计的不安全。To study the influence of the panel zone size on the ultimate bearing capacity of H-shaped steel frame, the steel frame consists of common beam, column and panel zone with cross-shaped section is analyzed. Based on the mechanical equilibrium criterion, some main parameters such as the axial compression ratio of column, the span-depth ratio of structure, the depth-width ratio of panel zone, and the radio of the width of panel zone to the depth of steel frame are studied. Results obtained show that the ratio curve for the ultimate bearing capacity of analysis model considering the panel zone size can be divided into three types. For the first class curve, plastic hinge is formed in the panel zone. While the strong column factor of the second class curve is greater than 1.2, the plastic hinge is formed in the beam-end, otherwise the plastic hinge is formed in the panel zone. If the strong column factor of the third class curve is less or equal to 0.8, the plastic hinge is formed in the panel zone, otherwise the plastic hinge is formed in the beam-end. The ratio curve for the ultimate bearing capacity of local frame model with H-shaped section can be mainly classified as the first class curve. Regardless of the panel zone size, the limit load is 1 to 5 times as that of considering the size of panel zone. Accordingly, it means that the result could be overestimated, which could lead to unsafe design of structure.

关 键 词：H型钢截面 节点域尺寸 柱轴压比 极限承载力 

分 类 号：TU391[建筑科学—结构工程]