KT形钢管相贯节点受力性能试验研究  

Experimental study on mechanical performance of KT⁃type steel tubular intersecting joint

作　　者：陈元坤[1,2] 李宏胜 熊政超[1] 王佳盟 朱爱珠 周伟伟[1] CHEN Yuankun;LI Hongsheng;XIONG Zhengchao;WANG Jiameng;ZHU Aizhu;ZHOU Weiwei(Central-South Architectural Design Institute Co.,Ltd,Wuhan 430071,China;School of Civil and Architectural Engineering,Wuhan University,Wuhan 430072,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中南建筑设计院股份有限公司,武汉430071 [2]武汉大学土木建筑工程学院,武汉430072 [3]华中科技大学土木与水利工程学院,武汉430074

出　　处：《建筑结构》2024年第12期28-34,共7页Building Structure

基　　金：国家自然科学基金创新研究群项目(52078230);湖北省博士后创新实践岗位(第一批)。

摘　　要：依托某户外剧场钢结构顶棚结构设计,首先对其管桁架关键KT形钢管相贯节点进行了足尺模型试验,测试分析了该节点相贯线、主管及支管应变分布规律。试验结果显示,在最大荷载作用下,相贯节点因支管相贯线附近部分屈服而不能继续承载,其余位置未屈服,表明支管相贯线附近位置是该相贯节点最薄弱位置。然后运用ANSYS有限元软件建立KT形钢管相贯节点有限元模型,将试验结果与有限元分析结果作对比,验证了有限元模型的准确性。最后通过有限元模拟探讨了增大支管厚度以及增设加劲肋对节点受力性能的影响。有限元分析结果显示,增大支管厚度对其受力性能影响较小;增设加劲肋可以有效降低支管相贯线附近位置的最大应力水平,能有效延缓支管屈服,明显提高管桁架节点的承载力。Based on the design of the steel roof structure of a outdoor theater project,a full-scale model test on the key KT-type steel tubular intersecting joint was carried out to analyze the strain distribution law of intersecting line,the main and branch tubulars of the joint.The test result shows that the under the maximum load,intersecting joint cannot continue to carry the load due to partial yielding near the intersecting line of the branch tubular,while the rest the position do not yield,indicating that near the intersecting line of the branch tubular is the weakest position of the intersecting joint.Then the finite element model of the KT-type steel tubular intersecting joint was established by using ANSYS finite element software,and the finite element model was verified by comparing the test result with the finite element analytical result.Finally,the effects of increasing the thickness of the branch tubular and the addition of stiffening ribs on the mechanical performance of the joint was discussed by finite element simulation.The finite element analysis result shows that increasing the thickness of the branch tubular affects mechanical performance insignificantly.Adding the stiffening ribs can obviously reduce the maximum stress level of the position near the intersecting line of the branch tubular,which can effectively postpone yield of the branch tubular,and significantly improve the bearing capacity of the tubular truss joint.

关 键 词：钢管相贯节点 足尺模型试验 受力性能 有限元分析 

分 类 号：TU392.3[建筑科学—结构工程]