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首页> 外文期刊>Journal of bridge engineering >Numerical Study of Damage Modes and Assessment of Circular RC Pier under Noncontact Explosions
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Numerical Study of Damage Modes and Assessment of Circular RC Pier under Noncontact Explosions

机译：非接触爆炸作用下圆形RC墩破坏模式的数值研究与评估

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Since the September 11, 2001, attack in New York, the number and intensity of terrorist activities around the world have attracted our attention toward infrastructure systems. Also, unintentional explosions resulting from fuel oil (gas) and fireworks in transit can lead to the interruption of the highway system. In addition, crucial bridges in a local war are main targets for hostile forces because they convey military supplies. Bridge piers are main axial bearing components and readily suffer damage under blast loading, so damage modes of bridges in different cases and explosive damage assessments should be studied to provide design advice for protection against explosion. In this paper, numerical models of reinforced concrete (RC) piers are built and verified by the explosion experimental acceleration data and the theoretical ultimate bearing capacity. Based on the verified model, different damage modes of RC piers in three noncontact explosive cases are investigated, in which the locations of explosive centers are at the bottom, the midheight, and the top of the pier. RC piers always experience flexural failure in these cases. The residual bearing capacities of piers before collapse are also studied, and the relations between trinitrotoluene (TNT) mass and residual bearing capacity are fitted by a cubic polynomial, resulting in a downward trend. From damage index and polynomial, the damage extent after blasting can be evaluated.
机译：自2001年9月11日在纽约发动袭击以来，全世界恐怖活动的数量和强度都引起了我们对基础设施系统的关注。此外，运输中的燃油（汽油）和烟火引起的意外爆炸也可能导致高速公路系统中断。此外，局部战争中的关键桥梁是敌对部队的主要目标，因为它们运送军事物资。桥墩是主要的轴向轴承组件，易在爆炸载荷作用下遭受破坏，因此应研究桥梁在不同情况下的破坏方式和爆炸性破坏评估，以提供防爆设计建议。本文建立了钢筋混凝土墩的数值模型，并通过爆炸实验加速度数据和理论极限承载力进行了验证。在验证模型的基础上，研究了三种非接触爆炸情况下钢筋混凝土墩的不同破坏方式，爆炸中心位于墩的底部，中部和顶部。在这些情况下，RC墩始终会发生弯曲破坏。还研究了倒塌前墩的残余承载力，并用三次多项式拟合三硝基甲苯（TNT）质量与残余承载力之间的关系，从而导致其下降趋势。根据破坏指数和多项式，可以评估爆破后的破坏程度。

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