Test and numerical simulation of truck collision with anti-ram bollards
Test and numerical simulation of truck collision with anti-ram bollards
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DOI：
10.1016/j.ijimpeng.2014.07.011
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发表时间：
2015
影响因子：
5.1
通讯作者：
Lin Chen;Yan Xiao;Guo Xiao;Chunlin Liu;A. Agrawal
中科院分区：
文献类型：
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作者：
Lin Chen;Yan Xiao;Guo Xiao;Chunlin Liu;A. Agrawal
基于一个实际的卡车碰撞试验的非弹性瞬态有限元模拟被用来调查的要求之间的碰撞中型卡车和防撞柱构造与钢管混凝土（CFT）。根据不同等级系船柱的性能要求，分别考虑中型卡车以50、65和80 km/h的速度撞上系船柱。数值结果表明，随着卡车撞击速度的增加，撞击力和系船柱挠度均增大。当速度相对较高（例如80 km/h）时，即使对系船柱造成很小的损坏，也存在卡车爬过系船柱的风险。分析表明，在撞击过程中，撞击力沿系船柱高度方向沿着是不均匀的，并可能发生变化。考虑到碰撞过程的复杂性和计算时间的消耗，提出了一种基于两自由度质量-弹簧-阻尼器系统模型的简化分析方法来模拟碰撞过程。在分析中，一个双线性弹簧被用来表征卡车考虑其“软前硬后”的特点时，冲击系船柱。结果表明，简化的分析模型与使用详细的卡车模型的有限元模型是一致的。
Inelastic transient finite element simulations based on an actual truck collision test are used to investigate the demands imposed during collisions between medium-duty trucks and anti-ram bollards constructed with concrete-filled steel tubes (CFT). The medium-duty truck is considered for crashing into a bollard at speed 50, 65, and 80 km/h, respectively, based on performance demands of bollards of different grades. Numerical results show that both the impact force and the bollard deflection increase with increasing the truck impact speed. When the speed is relatively high (e.g. 80 km/h), there is a risk of the truck climbing over the bollard, even with little damage to the bollard. The analyses show that the impact force along the height of the bollard is not uniform and may change during the impact process. Considering the complexity and computation time consumption, a simplified analysis based on a two-degree-of-freedom mass-spring-damper system model is developed to simulate the collision process. In the analysis, a bilinear spring is used to characterize the truck considering its “soft front and hard rear” characteristics when impacting bollards. Results show that the simplified analytical model is in good agreement with the finite element model using a detailed truck model.