环口套管加强型T型圆钢管节点的滞回性能研究

为了提高桁架管节点的承载力及抗震性能,采用环口套管加强方式对管节点进行加强.基于有限元分析环口套管加强型管节点在承受轴向循环荷载作用下的滞回性能.通过分析发现:环口套管加强模型滞回曲线包围的面积显著大于未加固模型滞回曲线所包围的面积.同时,由于环口套管提高了节点相贯部位的主管刚度,使得破坏部位于相贯处的焊趾处转移到了套管两端边缘部位的主管表面.此外,基于有限元计算结果,分析了模型的延性比和能量耗散等抗震性能参数.结果表明:加强型节点的延性比和能量耗散值均有大幅度提高.

Study on hysteretic behaviour of tubular T-joint reinforced with collar casing pipe

In order to improve the bearing capacity and anti-seismic behaviour, the tubular T-joint is reinforced with collar casing pipe. The hysteretic behaviour of tubular T-joint reinforced with collar casing pipe is studied under axial cyclic load by finite element method. It is found that the enclosed area of the rein- forced model is remarkably bigger than that of the un-reinforced one. Meanwhile, because the stiffness of tubular T-joint is improved by collar casing pipe, the failure position transfers from the weld toe to the chord surface near by the end edge of collar casing pipe. Additionally, the ductility ratio and the energy dis- sipation of the models are analyzed based on results of finite element calculation and the results show that the ductility ratio and energy dissipation of the reinforced model have been improved greatly.