槽型套管加强方钢管X形节点平面内受弯性能试验  

EXPERIMENTAL STUDY ON CHANNEL-CASING REINFORCED SHS X-JOINTS UNDER IN-PLANE BENDING

作　　者：常鸿飞[1,2] 李照伟 左文康 罗梓 安爱臣 宋心怡 CHANG Hong-fei;LI Zhao-wei;ZUO Wen-kang;LUO Zi;AN Ai-chen;SONG Xin-yi(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China;JiangSu Collaborative Innovation Center for Building Energy Saving and Construction Technology,Jiangsu Vocational Institute of Architectural Technology,Xuzhou,Jiangsu 221116,China;School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Service Center of General Aviation Industry in Caidian,Wuhan,Hubei 430100,China)

机构地区：[1]中国矿业大学,江苏省土木工程灾变与环境可靠度重点实验室,江苏徐州221116 [2]江苏建筑职业技术学院,江苏建筑节能与建造技术协同创新中心,江苏徐州221116 [3]上海交通大学船舶海洋与建筑工程学院,上海200240 [4]武汉市蔡甸区通用航空产业服务中心,湖北武汉430100

出　　处：《工程力学》2024年第5期96-106,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(51408596,51978657);中央高校基本业务费项目(2021ZDPY0209);江苏建筑节能与建造技术协同创新中心国际科技合作基金计划项目(SJXTGJ2101);江苏建筑节能与建造技术协同创新中心青年博士基金指导项目(SJXTBZ2106)。

摘　　要：槽型套管适用于在役钢管结构的节点局部加强,可有效提高节点承载力和刚度。为研究槽型套管对方钢管节点平面内受弯性能的加强效果,对5组支主管宽度比β为0.58、0.7和1.0的试件进行平面内受弯试验。试验表明槽型套管加强可以有效提升节点受弯性能,β=0.58和β=0.7时槽型套管加强节点的受弯承载力分别提高37%和163%;加强节点的刚度略低于等宽节点,但其延性更优;支主管宽度比和槽型套管厚度是影响加强节点平面内受弯性能的主要参数。槽型套管加强可有效保护节点主管,使试件失效模式由主管或焊缝破坏转移为支管破坏。进一步机理分析表明,加强套管可与主管管壁形成共同承载体,通过局部增厚作用提高节点承载力和刚度。据此对比分析了该类加强节点受弯承载力计算公式的适用性,可供设计参考。Channel-casing can effectively improve the capacity and stiffness of joints,which can be used for local reinforcement of steel tubular joint in service.To study the in-plane bending performance of channel-casing reinforced SHS(square hollow section)joint,5 SHS X-joints with a brace-to-chord diameter ratioβof 0.58,0.7 and 1.0 were tested under in-plane bending load.The results show that the channel-casing reinforcement can effectively improve the bending performance of joints.Whenβ=0.58 andβ=0.7,the bending capacity of channel-casing reinforced joints increases by 37%and 163%respectively.The stiffness of reinforced joints is slightly lower than that of the joint with equal width,but its ductility is better.The brace-to-chord diameter ratio and the thickness of the channel-casing are two key parameters influencing the in-plane bending behavior of the reinforced joints.And the reinforcement of channel-casing can effectively protect the chord of the joint,which leads to the transformation of failure mode of specimens from the failure of chord or welding seam to the failure of brace.Further mechanism analysis shows that the channel-casing can form a common bearing carrier with a chord wall,which improves the bearing capacity and stiffness of the joint owing to local thickening.Finally,the applicability of the formulas for calculating the flexural capacity of the channel-casing reinforced joints are compared and analyzed,and suggestions for design are proposed.

关 键 词：方钢管 X形节点 槽型套管加强 平面内受弯 承载机理 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1