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.
引文
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