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为研究加强垫板对承受支管轴力和主管轴力的N形圆钢管相贯节点静力性能的影响,对未加强节点和垫板加强节点试件进行了试验研究,并运用有限元方法对试验节点进行了非线性分析。比较试验与有限元分析得到的极限承载力结果和破坏模式,发现二者吻合较好。改变垫板各几何参数,对加强节点进行有限元分析。结果表明,加强垫板可以降低节点应力集中系数、减小局部变形、提高节点极限承载力;增大垫板长度和弧度对节点极限承载力的影响很小,而增大垫板厚度可有效提高节点极限承载力,但当垫板厚度增大到一定值时,再增加垫板厚度对节点极限承载力提高无益而对结构整体受力不利。
In order to study the influence of the pad on the static performance of the tubular N-joints, the strength of the joints of the N-shaped steel tube subjected to the axial force and the axial force of the support tube were studied. The experimental nodes were analyzed nonlinearly. Comparing the results of ultimate bearing capacity and failure mode obtained from the test and finite element analysis, we found that the two agree well with each other. Change the geometric parameters of the pad, to strengthen the node for finite element analysis. The results show that the strengthening plate can reduce the stress concentration factor, reduce the local deformation and increase the ultimate bearing capacity of the joint. Increasing the length and curvature of the plate have little effect on the ultimate bearing capacity of the joint, while increasing the thickness of the plate can effectively increase However, when the thickness of the pad increases to a certain value, increasing the thickness of the pad further increases the ultimate bearing capacity of the node and does not contribute to the overall force of the structure.