平面弯曲下带加劲肋的T型方管节点极限承载力分析  

Analysis of the ultimate loading capacity of rib stiffener reinforced RHS T-type joints loaded by in-plane bending moment

作　　者：袁波[1] 王旭[1] 刘远征[1] 魏艳辉[1] 

机构地区：[1]贵州大学空间结构研究中心,贵阳550003

出　　处：《应用力学学报》2018年第5期1096-1102,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51168010)

摘　　要：为得到加劲肋加强T型方管节点承受平面内弯矩作用下极限承载力提高系数ψ的表达式,本文在试验与有限元对比的基础上,用ABAQUS软件进行了参数化分析,并用Origin软件进行了回归分析。结果表明:支管与主管截面宽度之比β=0.4~0.7时,节点的破坏主要是上壁面屈服所致,加劲肋加强T节点极限承载力平均是无加劲肋节点的2.55倍;节点承载力与加劲肋厚度t_w、加劲肋宽度b_w、β皆呈正相关,影响程度为β>b_w>t_w;加劲肋承载力M_S随加劲肋厚度与主管截面宽度之比τ、加劲肋宽度与主管截面宽度之比η和β的增加而增加,其中三者影响程度大小次序为β>η>τ,提高系数ψ随τ、η的增加而增大,其中η的影响大于τ,β对ψ的影响不大。最后得出了加劲肋加强T型方管节点承受平面内弯矩时极限承载力的计算公式。In this paper, to get the ultimate bearing capacity improvement coefficient ψ of rib stiffener strengthen RHS T-type joint loaded by in-plane bending,on the basis of the tests and comparison with the finite element analysis,ABAQUS parametric analysis and ORIGIN regression analysis are conducted. The results show that when β is 0.4 to 0.7, chord face yielding is the mainly mode of failure, the ultimate bearing capacity of rib stiffener strengthen T-type joint is 2.55 times compared to the no rib stiffener T-type joint, the ultimate bearing capacity of T-type joint is positive correlated with parameters t_w,b_w,β, and in the order of β>b_w>t_w,the ultimate bearing capacity of rib stiffener M_S increases with increasing τ,η,β, and in the order of β>η>τ, the improvement coefficient ψ increases with increasing τ,η, the influence of η is more than τ, the parameters β has little effect to the improvement coefficient ψ. Finally, the ultimate bearing capacity calculation formula of rib stiffener strengthen RHS T-type joint loaded by in-plane bending is obtained.

关 键 词：T型节点 加劲肋 平面内弯矩 极限承载力 有限元分析 

分 类 号：TU356[建筑科学—结构工程]