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采用落锤冲击试验机进行了4个T形管节点的抗冲击性能试验研究。通过试验获得了冲击能量E、主管长径比(α=L/D)和主管直径D等参数对管节点破坏模态和变形模式的影响规律,分析了管节点在冲击力作用下整体和局部变形特性,以及冲击力、位移、应变时程曲线与冲击力-变形关系曲线。试验结果表明:主管长径比一定时,冲击能量的大小影响支管受撞T形管节点的破坏模态;破坏模态主要为主管上表面局部屈曲和主管上表面局部屈曲伴随主管整体弯曲变形两种形式;主管上表面局部屈曲产生的塑性变形区域受冲击力的影响不大,但其屈曲凹陷深度随着冲击能量的增大而增大;局部屈曲耗散了大部分冲击能量。基于能量的塑性铰线理论,提出了等效冲击承载力简化评估方法。
The impact performance of four T-shaped pipe joints was tested by drop-weight impact testing machine. The influences of impact energy E, length-diameter ratio of main pipe (α = L / D) and diameter D of main pipe on the failure mode and deformation mode of pipe joints were obtained through experiments. The effects of pipe joints on global and local Deformation characteristics, as well as impact force, displacement, strain time history curve and impact force - deformation curve. The results show that the impact energy of the main pipe affects the failure modes of the T-shaped pipe joints when the length-diameter ratio of the main pipe is constant. The main failure modes are the local buckling of the upper surface of the main pipe and the local buckling of the upper surface of the main pipe. The plastic deformation zone of the superficial buckling on the superficial surface is not affected by the impact force, but the buckling depression depth increases with the impact energy. The local buckling dissipates most of the impact energy. Based on the plastic ductile theory of energy, a simplified method of equivalent impact capacity assessment is proposed.