方型鸟嘴式T形方管节点的应力集中特性研究

发布时间：2018-10-08 20:41

【摘要】：基于试验测试和有限元分析对方型鸟嘴式T形钢管节点在主管和支管轴力作用下的应力集中特性进行研究,得到热点区域的应力集中系数(SCF)大小及分布规律。结果表明:方型鸟嘴式节点的热点外推区应力分布符合二次变化规律,其主管应力集中高于支管,且最大SCF通常出现在热点Cr-F、Sa-A、Sa-C、Sa-D等位置。鸟嘴式节点在主管轴力作用下的SCF值通常较小,但在支管轴力作用下的应力集中显著,且SCF受几何无量纲参数β、2γ和τ的影响较大。进一步与传统正放式节点对比后发现,在几何尺寸相同的情况下,方型鸟嘴式节点的最大SCF普遍低于传统正放式节点,且β值越小这种降低幅度越明显;但当β0.75时,鸟嘴式节点的SCF值可能高于正放式节点。
[Abstract]:Based on the experimental test and finite element analysis, the stress concentration characteristics of the T-shaped steel pipe joints under the axial force of the supervisor and branch are studied, and the (SCF) size and distribution of the stress concentration factor in the hot spot region are obtained. The results show that the stress distribution of the hot spot extrapolation zone of the square type bird beak joint is in accordance with the quadratic variation law, and the stress concentration in charge is higher than that of the branch pipe, and the maximum SCF usually appears in the hot spot Cr-F,Sa-A,Sa-C,Sa-D and other positions. The SCF value of the beak joint is usually small under the action of the axial force, but the stress concentration is significant under the axial force of the branch pipe, and the SCF is greatly affected by the geometric dimensionless parameters 尾 2 纬 and 蟿. Compared with the traditional forward type node, it is found that the maximum SCF of the square beak node is generally lower than that of the traditional positive type node under the same geometric size, and the lower the 尾 value is, the more obvious the decrease is, but when 尾 0.75, the maximum SCF of the square type bird beak node is generally lower than that of the traditional positive play node, but when 尾 0. 75, The SCF value of the beak node may be higher than that of the positive node.
【作者单位】：上海交通大学;
【分类号】：TU392.3

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