Impact analysis of I-Lam sandwich system for over-height collision protection of highway bridges
Impact analysis of I-Lam sandwich system for over-height collision protection of highway bridges
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DOI：
10.1016/j.engstruct.2004.03.004
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发表时间：
2004-06
影响因子：
5.5
通讯作者：
P. Qiao;Mijia Yang;A. Mosallam
中科院分区：
文献类型：
--
作者：
P. Qiao;Mijia Yang;A. Mosallam
由于交通量的增加和桥梁结构的碰撞损坏的发生率，有迫切需要开发一种用于公路桥梁的碰撞保护系统，以防止超高卡车的冲击。本文建立了考虑剪切效应的底面板-刚性支承夹层结构冲击响应的线弹性模型。给出了I-Lam碰撞保护系统的离散模型和集中载荷及分布载荷情况下的解，预测了接触力历程和最大挠度。与LS-DYNA有限元分析（FEA）相比，所提出的相对简单的分析方法可以准确地预测冲击响应。离散模型显示出与FEA预测更好的相关性，而分布力模型高估了顶面板的挠度，但低估了峰值接触力。所建立的模型包括剪切机制，可以用来近似的刚性支撑的夹层结构的冲击响应的超高卡车。最大挠度和峰值接触力这两个重要的影响因子可用于碰撞防护夹层结构的初步设计和优化。
Due to increased traffic volumes and incidence of impact damaged to bridge structures, there is a pressing need to develop a collision protection system for highway bridges against over-height truck impact. In this study, a linear elastic model for the impact response of bottom face sheet-rigidly supported sandwich structures including shear-off effect is developed. The solutions for a discrete model and concentrated and distributed loading cases for collision protection I-Lam system are obtained, of which the contact force history and maximum deflection are predicted. Compared to the LS-DYNA finite element analysis (FEA), the relatively simple analytical methods proposed accurately predict the impact response. The discrete model shows a better correlation with FEA predictions, while the model with distributed forces overestimates the deflection of the top face sheet but under-evaluates the peak contact force. The developed models including the shear-off mechanism can be used to approximate the impact response of rigidly supported sandwich structures hit by an over-height truck. The two important impact factors, i.e. the maximal deflection and peak contact force, can be used in primary design and optimization of collision protection sandwich structures.