钢管混凝土桁架焊接T型管节点热点应力集中系数研究  

Hot Spot Stress Concentration Factor of Welded Tubular T-Joints in Concrete-Filled Steel Tube Truss

作　　者：卫星[1] 赵骏铭 肖林[1] 吴琛泰 温宗意 WEI Xing;ZHAO Junming;XIAO Lin;WU Chentai;WEN Zongyi(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Institute of Magnetic Levitation and Electromagnetic Propulsion,China Aerospace Science and Industry Aerodynamicsn Technology Academy,Beijing 100097,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国航天科工飞航技术研究院磁悬浮与电磁推进技术总体部,北京100097

出　　处：《中国铁道科学》2022年第2期1-9,共9页China Railway Science

基　　金：国家自然科学基金资助项目(52078424)。

摘　　要：运用有限元软件ANSYS建立钢管混凝土桁架焊接T型管节点模型,进行支管轴向拉力作用下管节点热点应力集中系数(Stress Concentration Factor,SCF)研究。结果表明:T型管节点的主管冠点处SCF与管径比、径厚比和壁厚比均成正相关,而主管鞍点处SCF虽与径厚比和壁厚比成正相关,但与管径比呈负相关;相比于主管,支管SCF整体水平较低,且随几何参数变化幅度较小;主管SCF沿管节点相贯线的分布模式与管径比、径厚比相关,但受壁厚比的影响很小;管节点SCF最大值与径厚比、壁厚比成正相关,随管径比的变化规律与径厚比的取值有关;基于有限元计算结果,可推导出钢管混凝土桁架焊接T型管节点SCF最大值计算式。Models of the welded tubular Tjoints in concretefilled steel tube trusses were established using the finite element software ANSYS,to study the hot spot stress concentration factor(SCF)of the tubular joint under axial tension in the brace was studied.Results show that the SCF at the chord crown point of the tubular Tjoint is positively correlated with the bracetochord diameter ratio,the chord wall slenderness ratio and the bracetochord thickness ratio.The SCF at the chord saddle point is positively correlated with the chord wall slenderness ratio and the bracetochord thickness ratio,but is negatively correlated with the bracetochord diameter ratio.Compared with the chord,the whole level for the SCF of the brace is lower,and its variation with geometric parameters is smaller.The distribution pattern of the SCF along the chord intersection line of the tubular joint is related to the bracetochord diameter ratio and chord wall slenderness ratio,whereas the pattern is slightly influenced by the bracetochord thickness ratio.The maximum SCF of the tubular joint is positively correlated with the chord wall slenderness ratio and the bracetochord thickness ratio.The variation law of the maximum SCF with bracetochord diameter ratio is correlated to the chord wall slenderness ratio.Based on the finite element calculation results,the formulas of the maximum SCF for welded tubular Tjoints in concretefilled steel tubular trusses can be deduced.

关 键 词：钢管混凝土 桁架 焊接T型管节点 热点应力集中系数 有限元分析 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]