T型铸钢节点冲击响应研究

对两端简支 T 型铸钢节点在冲击荷载下的响应进行了非线性有限元分析,得到不同荷载参数下节点的冲击力时程曲线和变形时程曲线. 分析中将铸钢节点的变形分为主管管壁局部凹陷、主管整体弯曲和支管轴向变形三部分,通过计算得到三部分变形随冲击时间变化的规律及其所耗散的能量在节点总耗能中所占的比例. 结果表明:冲击动能相同时,冲击荷载和支管轴向变形的最大值与初始冲击速度有关,节点塑性耗能总量随主管径厚比的增大而增加,随主管长径比及主支管直径比的增大而减小. 当主管长径比较小时,支管变形大于主管变形. 支管与主管的直径接近时,节点的局部凹陷变形可以忽略.

Investigation of Impact Response of Cast Steel T-Joint

The dynamic response of the tubular cast steel T-joint under the impact load was investigated by using the nonlinear finite element method. The time-history curves of the impact load and the deformation of different cast steel joints were obtained. Three different deformations of cast steel joints were found including the pipe wall sag, the overall bending of the main pipe, and the axial deformation of the branch pipe. In addition, the relationship between the energy dissipation ratios of these deformations and the impact time was established. The research results show that the impact load and the maximum axial deformation of the branch pipe are related to the initial impact velocity at the same impact energy; the plastic energy consumption of joints increases with the growth of the diameter-thickness ratio of the main pipe, and decreases with the increase of the length-diameter ratio of the main pipe and the diameter ratio of the main pipe to the branch pipe. The deformation of the main pipe is larger than that of the branch pipe when the length-diameter ratio of the main pipe is small; and the pipe wall sag can be neglected when the diameter of the main pipe is close to the diameter of the branch pipe.