平面外弯矩作用下的T形铸钢节点承载力非线性分析

Non-linear analysis on cast tubular T-joints loaded by out-plane bending

铸钢节点造型美观、受力性能合理,在建筑结构当中得到了越来越广泛的应用。与传统焊接管节点相比,铸钢节点用圆形倒角取代了相贯线处的焊缝,应力集中小,承载力高。针对T形铸钢节点,通过Solidworks软件建立三维模型,采用通用有限元软件Ansys进行非线性分析。结合有限元计算结果,对T形铸钢节点在平面外弯矩作用下的承载力进行了参数分析,给出了T形铸钢节点在支管受平面外弯矩作用下的极限承载力公式。公式确立了极限承载力与铸钢节点几何参数之间的联系。在焊接管节点几何参数的基础上,铸钢节点增加了由C.D.Edwards首次提出的倒角系数ρ并重点讨论了该系数对铸钢节点承载力的影响。

Cast tubular joints are being increasingly applied in bridge, high-rise and industrial construction, because from a structural and aesthetic point of view they are often superior to directly welded joints. Cast tubular joints have lower stress concentrations and higher ultimate loading capacity than welded joints because they have better shapes of fillet and because there are no welds in the critical areas. In this paper, we performed a lot of parametric analysis of cast T-joints. The geometry model was established using Solidworks. Non-linear analysis was carried out using the commercial finite element programme Ansys. Parametric equations of ultimate loading capacity derived from the results of finite element analysis are presented for the usual range of basic shapes of T-joints loaded by out-plane bending. The sensitivity of the ultimate loading capacity in cast tubular joints to variation in the geometric parameters has been assessed. Besides the parameters which governing the stresses in welded joints, an additional parameter ρ that is defined by C. D. Edwards has been introduced to describe the size of fillet. In this paper, the sensitivity of ultimate loading capacity of cast tubular joints to the parameter ρ is presented.