支管受轴向受拉工况下CHS-CFSHS T型节点应力集中系数计算公式  

Calculation formula of SCF for CHS-CFSHS welded T-joints with brace under axial tension

作　　者：杨德磊[1,2] 童乐为[1] YANG De-lei;TONG Le-wei(School of Civil Engineering,Tongji University,Shanghai 200092,China;School of Architecture and Civil Engineering,University of Huanghuai,Zhumadian 463000,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]黄淮学院建筑工程学院,河南驻马店463000

出　　处：《吉林大学学报（工学版）》2019年第6期1891-1899,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目（50478108,51778457）

摘　　要：基于具有可靠精度的圆管-方管混凝土T型节点应力集中系数(SCF)的有限元计算方法进行了160个有限元模型的SCF计算,对影响SCF的参数进行了分析,掌握了各参数对SCF的影响规律,提出了T型焊接节点在支管受轴向受拉工况下SCF的计算公式,并且将公式计算值与有限元数据进行了比较。分析表明:在支管受轴向受拉工况下,支管上和主管上0°、60°、90°这6个位置的SCF基本包括SCF最大值可能发生的位置;T型节点SCF计算公式中应包含β的二次函数、2γ的二次函数和τ的幂函数,且三者的影响耦合;回归的SCF计算公式具有可靠的精度。Based on the finite element method of SCF of CHS-CFSHS T-joints with reliable accuracy,160 finite element models were established to calculate SCF of CHS-CFSHS T-joints when brace is under axial tension which are made up of circular hollow section(CHS)braces and concrete-filled square hollow section(CFSHS)chords.Parameters affecting SCF of the joint were analyzed.In addition,while grasping the influence law of each parameter on SCF,it proposed a calculation formula for SCF when brace is under axial tension,and made a comparison between the calculated value and finite element data.The results show that the six positions of 0°,60°and 90°on the brace and the chord basically cover the position at which maximum SCF may occur when brace is under axial tension;and quadratic functions ofβand 2γas well as power function ofτshould be included in the calculation formula of SCF.Moreover,the influences of the three parameters are coupled with each other,and the regressive calculation formulas of SCF have reliable accuracy.

关 键 词：结构工程 疲劳性能 SCF计算公式 参数分析 圆管-方管混凝土T型节点 应力集中系数 

分 类 号：TU392.3[建筑科学—结构工程]