方钢管桁架垂直相贯缺陷节点的加固方法  

Reinforcement method of defective perpendicularly-intersecting node of square steel-tubular truss

作　　者：王秀丽[1,2] 张虎跃 张强[1,2] 苏海明 吴小燕 WANG Xiu-li;ZHANG Hu-yue;ZHANG Qiang;SU Hai-ming;WU Xiao-yan(College of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Research Center of Disaster Prevention&Mitigation in Western Civil Engineering,the Ministry of Education,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Gansu Construction Investment(Holding)Group Corporation,Lanzhou 730050,China;Gansu Building Investment Steel Structure Co.Ltd.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]甘肃建投集团总公司,甘肃兰州730050 [4]甘肃建投钢结构有限公司,甘肃兰州730050

出　　处：《兰州理工大学学报》2018年第2期128-134,共7页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51278236);甘肃省科技支撑计划项目(1504GKCA040)

摘　　要：方钢管桁架垂直相贯节点在工程施工过程当中,由于现场节点焊接连接时出现了对接误差,造成连接区域焊缝长度不足,出现局部应力集中现象,导致承载力减弱,因此需要对此类节点进行加固补强.以某工程钢结构罩棚中的个别有缺陷的方钢管桁架垂直相贯节点为例,采用ANSYS有限元软件分别对缺陷节点、无缺陷节点及不同加固方式下的节点的极限承载力进行数值模拟研究.对比分析不同加固方案下节点的破坏模式与极限承载力,制定出最优加固方案.研究表明:与端部分别采用1块、3块顶板加固方案相比较,采用2块顶板加固方案的节点承载力明显提高.During construction process of projects with perpendicularly intersecting node on their square steel tube truss,the joint error may appear due to on-site welding of the joint node,resulting in occurrence of insufficient weld length and local stress concentration in the joint area,leading to the decrease of bearing capacity,so that it is necessary to reinforce such joint.Taking the exceptional defective perpendicularly intersecting nodes of square steel-tubular truss for the steel-structural cover shed in a project as an example,numerical simulative study of ultimate bearing capacity of the defective node,defect-free node,and the node reinforced with different methods was conducted with finite element software ANSYS.The failure mode and ultimate bearing capacity of the node to be analyzed comparatively and an optimal reinforcement scheme was laid down.The research shows that compared with the scheme of reinforcement with one-or three-top plate at the end,the bearing capacity of two-top plate strengthening scheme will obviously be improved.

关 键 词：相贯节点 ANSYS模拟 缺陷节点加固 破坏模式 承载力 

分 类 号：TU312.3[建筑科学—结构工程] TU391