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Behavior and design of reinforced concrete building columns subjected to low-velocity car impact
Structures ( IF 4.1 ) Pub Date : 2020-05-07 , DOI: 10.1016/j.istruc.2020.04.054
K.M.A. Sohel , K. Al-Jabri , A.H.S. Al Abri

Exposure of the columns on the first floor to lateral vehicular impact poses a great threat to the structural stability of buildings. In most cases, these columns may not be designed to resist the lateral impact force caused by the car-column collision. The dynamic impact force will cause deformation, reduce the bearing capacity of the column, and can cause catastrophic failure. In this study, the effect of a car impact on an axially loaded building column is evaluated by numerical simulation. An experimentally verified car model with a mass of 2203 kg and an axially loaded square reinforced concrete (RC) column model have been used for the numerical simulations. The results of the numerical analysis showed that the column-foundation joint is highly affected by the lateral impact force when the impact velocity is more than 30 km/h. A shear fracture occurs at the joint when the speed exceeds 40 km/h for columns with dimensions 400 mm or less. The axially loaded RC column has a higher impact resistance than columns without axial loads. From the impact force-time histories, the equivalent static forces (ESFs) have been calculated for the different ranges of impact velocities and different sizes of columns. It is found that the calculated ESF values are higher than the recommended values given by Eurocode 1. New proposed guidelines for the estimation of ESF and design recommendations are provided for the lateral impact load caused by a veered car on a building column.



中文翻译:

低速汽车撞击下钢筋混凝土建筑柱的性能与设计

一楼的柱子受到侧向车辆冲击,对建筑物的结构稳定性构成了极大的威胁。在大多数情况下,这些立柱可能不会设计为抵抗由车柱碰撞引起的横向冲击力。动态冲击力将导致变形,降低柱的承载能力,并可能导致灾难性故障。在这项研究中,通过数值模拟评估了汽车撞击在轴向受力建筑物柱上的影响。数值模拟使用了质量为2203 kg的经过实验验证的汽车模型和轴向加载的方形钢筋混凝土(RC)柱模型。数值分析结果表明,当冲击速度大于30 km / h时,侧向冲击力对柱基节点产生很大影响。对于尺寸为400 mm或更小的圆柱,当速度超过40 km / h时,在接头处会发生剪切断裂。轴向加载的RC柱比没有轴向加载的柱具有更高的抗冲击性。根据冲击力-时间的历史记录,已针对冲击速度的不同范围和不同尺寸的柱计算了等效静力(ESF)。结果发现,计算出的ESF值高于Eurocode 1给出的推荐值。新的ESF估算指导原则和设计建议针对了转向柱在建筑立柱上引起的横向冲击载荷。根据冲击力-时间的历史记录,已经针对冲击速度的不同范围和不同尺寸的柱计算了等效静力(ESF)。结果发现,计算出的ESF值高于Eurocode 1给出的推荐值。新的ESF估算指南和设计建议针对了转向柱在建筑柱上引起的横向冲击载荷。根据冲击力-时间的历史记录,已经针对冲击速度的不同范围和不同尺寸的柱计算了等效静力(ESF)。结果发现,计算出的ESF值高于Eurocode 1给出的推荐值。新的ESF估算指南和设计建议针对了转向柱在建筑柱上引起的横向冲击载荷。

更新日期:2020-05-07
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