支管轴力和弯矩联合作用下T形圆钢管相贯节点热点应力分析与计算  

Hot spot stress analysis of CHS T-joint under combined loads

作　　者：姚尧[1] 舒兴平[1] 袁智深[1,2] 卢倍嵘[1,3] 

机构地区：[1]湖南大学土木工程学院钢结构研究所,长沙410082 [2]中南林业科技大学土木工程与力学学院,长沙410004 [3]湖南科技大学土木工程学院,湘潭411201

出　　处：《建筑结构》2013年第22期26-32,共7页Building Structure

基　　金：国家自然科学基金项目(50978089;50748029);湖南省自然科学基金重点项目(09JJ3102)

摘　　要：支管荷载形式对节点的应力集中系数影响很大,利用ANSYS有限元程序模拟了T形圆钢管相贯节点在三种基本荷载(支管轴力、平面内弯矩以及平面外弯矩)单独作用下的热点应力分布曲线以及应力集中系数,分析结果与试验结果、文献公式计算结果进行了对比,结果吻合良好,表明该模型较为精确地模拟了T形节点的应力分布。进而利用该模型研究了T形圆钢管相贯节点在基本荷载及其不同联合荷载作用时的热点应力分布情况,获得了最大热点应力及其分布位置,分析同时考虑了无量纲几何参数对最大热点应力的影响。在API规范公式的基础上,提出了计算最大热点应力的修正公式,按修正计算式计算得到的值与有限元分析结果吻合良好,且具有较好的适用性。Loading forms on brace have great effect on the stress concentration factor（ SCF） of the joints. ANSYS program was used to simulate the stress distribution of CHS T-joint under three kinds of basic load,respectively. Hot spot stress（ HSS） distribution curve and SCF were obtained. Comparisons between analysis and test,the formula of reference were made which show good agreement and confirm the accuracy of the ANSYS model. Taking the geometrical parameters into account,further analysis was made to investigate the HSS distribution of T-joint under different combinations of basic load.The maximum HSS and its location were obtained. Finally,the formula of the maximum HSS was revised based on the API code formulae. The maximum HSS calculated by the revised formula agrees with ANSYS results.

关 键 词：T形圆钢管相贯节点 应力集中系数 有限元分析 

分 类 号：TU391.3[建筑科学—结构工程] TU392.3