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首页> 外文期刊>Transportation Research Record >Dynamic Actions on Bridge Slabs due to Heavy Vehicle Impact on Roadside Barriers
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Dynamic Actions on Bridge Slabs due to Heavy Vehicle Impact on Roadside Barriers

机译：重型车辆对路障的冲击对桥板的动力作用

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摘要

The use of roadside safety barriers in Italy has changed in recent years: the number of installed devices has increased, and so have their stiffness and resistance. These changes were necessary because early barrier design was inadequate to contain and redirect heavy vehicles. The change in barrier design led to an increase in stiffness and resistance; consequently, the action transferred to the structure by the device increased. The need for resistance on the bridge slabs can be too high because the peculiar action of the roadside barriers was not adequately taken into account in the oldest bridge design codes. In addition, characterizing the actions transferred to the bridge slab is difficult because of the dynamic nature of vehicle impacts on roadside barriers. Given the impossibility of performing a full-scale laboratory test for every bridge deck, the use of computational mechanics applied to dynamic impact/interaction problems is one of the best ways to establish these actions in the project phase. Research was conducted into the use of a three-dimensional finite element model of the bridge slab-barrier-vehicle system to perform a numerical simulation of the impact, according to the procedure used for the roadside barrier homologation crash test, described in the European Standard EN 1317.
机译：近年来，意大利在路边安全栅栏的使用发生了变化：已安装设备的数量有所增加，其刚度和阻力也有所增加。这些更改是必要的，因为早期的屏障设计不足以容纳和重定向重型车辆。屏障设计的改变导致刚度和阻力的增加；结果，装置传递给结构的作用增加了。对桥梁平板的抵抗力可能太高，因为在最古老的桥梁设计规范中并未充分考虑路边障碍物的特殊作用。此外，由于车辆撞击路边障碍物的动态特性，很难确定传递到桥板的作用的特征。考虑到不可能对每个桥面甲板进行全面的实验室测试，因此将计算力学应用于动态冲击/相互作用问题是在项目阶段确定这些行为的最佳方法之一。根据欧洲标准中描述的路边障碍物同源性碰撞试验所使用的程序，对桥板-障碍物-车辆系统的三维有限元模型进行了研究，以进行冲击的数值模拟。 EN 1317。

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