管道撞击钢筋混凝土板试验研究与数值模拟

Experimental Study and Numerical Simulation of Pipeline Impact on Reinforced Concrete Slab

针对管道破裂对邻近建筑结构的影响,开展了管道撞击钢筋混凝土板试验研究,获得了端部封闭和未封闭管道垂直撞击钢筋混凝土靶的开坑深度及不同位置的应变时间历程曲线及加速度时间历程曲线,并利用有限元软件进行了仿真计算,分析了管道撞击速度和撞击角度对钢筋混凝土板冲击响应和破坏形态的影响。结果表明:端部未封闭管道垂直撞击造成的钢筋混凝土开坑面积和开坑深度最大,钢筋混凝土板出现钢筋被剪断的现象;端部未封闭管道撞击角度的变化会对撞击力和撞击位置上下两侧的开坑深度均有影响,且上侧的开坑深度对角度的变化更为敏感。研究结果可为建筑物内管道设计和维护提供参考。

To study the influence of pipeline rupture on adjacent building structures,an experimental study of pipeline impact on reinforced concrete slab was carried out.The opening pit depth of both unclosed and closed pipes during vertical impacts on reinforced concrete slab targets,as well as the strain time history curves and acceleration time history curves at different positions were obtained.The influence of pipeline impact velocity and impact angle on the impact response and damage patterns of reinforced concrete slabs were analyzed using finite element method.The results show that the vertical impact of the unclosed pipe end has the largest pit area and depth,and the reinforcement bar shows shear failure in the reinforced concrete slab.Changing the impact angle of the unclosed pipe end will affect the impact force and pit depth on both sides of the impact position.Especially,the pit depth of the upper side is more sensitive to the change of impact angle.The research results can provide a reference for the design and maintenance of pipelines in buildings.