第一作者姚术健男，博士生，1988年4月生

通信作者蒋志刚男，博士，教授，1961年9月生

汽车炸弹钢箱梁内部爆炸局部破坏效应分析

姚术健1,蒋志刚2，卢芳云1，张舵1，赵楠3

(1.国防科技大学理学院，长沙410073; 2. 国防科技大学指挥军官基础教育学院，长沙410072;3.中国水电顾问集团中南勘探设计研究院，长沙410014)

摘要：采用ALE(Arbitrary Lagrangian Eulerian,ALE)多物质流固耦合算法，对汽车炸弹 (TNT当量200 kg~1 500 kg) 在双层桥梁下层桥面典型位置爆炸的局部破坏效应进行了数值模拟，研究了内爆炸冲击作用下钢箱梁的响应过程、破坏模式、破坏参数及其主要影响因素。结果表明：破坏模式及破坏参数与爆炸位置和TNT当量密切相关，爆炸位置对桥梁主要受力体系的受损程度影响较为明显，加劲肋对其垂直方向的破口具有约束作用，箱体对冲击波的约束效应使破坏作用加剧。合理设置加劲肋、加强重要构件和设置防爆层等措施有利于提高桥梁结构抗爆能力。

关键词：桥梁工程；钢箱梁；汽车炸弹；数值模拟；破坏效应

基金项目：国家自然科学基金资助项目(11202236)；国防科技大学科研计划项目(JC11-02-18)

收稿日期：2013-08-20修改稿收到日期：2014-04-03

中图分类号:O383；TU511

文献标志码：A

DOI:10.13465/j.cnki.jvs.2015.07.035

Abstract:The response process, failure modes and damage parameters of a double deck steel box girder subjected to internal blast loading of vehicle bombs (TNT equivalent 200kg~1500kg) were simulated by using the ALE (Arbitrary Lagrangian Eulerian) multi-material fluid-solid coupling arithmetic. In the simulation, three typical blast locations on the lower deck were considered. The results show that: the failure modes and damage parameters have a clear correlation with the TNT weight and blast location, and the explosion locations have strong effects on the damage degree of steel trusses. Stiffening ribs can restrict the crack in its vertical direction. The damage effects will be intensified by the restriction of the box-shaped girder. Some useful measurements were also proposed which can help engineers in bridge designing and protection consideration against possible explosion events.

Analysis on local damage of steel box girder under internal blast loading of vehicle bomb

YAOShu-jian1,JIANGZhi-gang2,LUFang-yun1,ZHANGDuo1,ZHAONan3(1. College of Science, National University of Defense Technology,Changsha 410073,China2.College of Basic Education, National University of Defense Technology, Changsha 410072,China3.HydroChina Zhongnan Engineering Corporation, Changsha 410014,China)

Key words:bridge engineering; steel box girder; vehicle bomb; numerical simulation; damage effect

“9.11”事件以来，桥梁反恐抗爆问题得到国际桥梁界的重视[1-4]。桥梁规模巨大、结构复杂，原型试验和理论研究面临困难，而数值模拟可以很好地再现爆炸响应过程，已成为桥梁抗爆研究的重要方法。大跨度缆索承重桥遭受恐怖爆炸袭击的风险较大，许多学者对其爆炸冲击响应进行了数值模拟研究。……