爆炸荷载下钢箱梁桥动力响应机理与关键参数研究  

Dynamic Response Mechanism and Key Parametric Study of Steel Box Girder Bridge under Explosion Load

作　　者：李豪凯 王党雄 赵嘉敏 吴子燕[1] LI Haokai;WANG Dangxiong;ZHAO Jiamin;WU Ziyan(School of Mechanics and Civil Architecture,Northwestern Polytechnical University,Xi'an 710129,China)

机构地区：[1]西北工业大学力学与土木建筑学院,陕西西安710129

出　　处：《防灾减灾工程学报》2023年第5期1112-1121,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金(52108417);陕西省自然科学基础研究计划项目(2021JQ‑101);中央高校基本科研业务费专项资金(G2019KY05106)资助。

摘　　要：为了探讨钢箱梁桥在爆炸荷载下的动力响应机理及关键参数对其影响规律,基于流固耦合方法,建立了钢箱梁桥、空气和炸药有限元模型,分析了爆炸荷载下钢箱梁桥动力响应机理。随后针对钢箱梁桥的关键参数,分析了各参数对钢箱梁桥的动力响应影响灵敏度,提出了钢箱梁桥在抗爆设计时参数选取规律。研究结果表明:在爆炸荷载作用下,钢箱梁桥的破坏主要分为三阶段。钢材性能由Q345提高为907A钢,钢箱梁桥的凹坑深度和塑性变形区面积减小了33.91%和27.93%;截面形式和爆炸位置两个关键参数的改变涉及纵横隔板对主要迎爆区薄弱位置的加固,能够明显提高钢箱梁桥的抗爆能力。比例距离0.1 m/kg^(1/3),爆炸位置相同,约束形式由简支改为固支,对钢箱梁桥抗爆性能提升几乎无影响。In order to investigate the dynamic response of a steel box girder bridge under an explosion load mechanism and the regularity of the influence of key parameters,the finite element models of steel box girder bridge,air and explosive were established based on the fluid-structure interaction method.The dynamic response mechanism of the steel box girder bridge under explosion load was then analyzed.Subsequently the sensitivity of the influence of each parameter on the dynamic response of steel box girder bridge was assessed according to the key parameters of steel box girder.Meanwhile,a selection rule for parameters in anti-explosion design of steel box girder bridge was proposed.The results show that the failure of steel box girder bridges can be mainly divided into three stages.The properties of steel improved from Q345 to 907A lead to a reduction in the pit depth and plastic deformation area of the steel box girder bridge by 33.91%and 27.93%,respectively.The change of the two key parameters,section form and explosion location,involves the reinforcement of the weak position in the main blast area by the vertical and horizontal clapboards,which can obviously improve the anti-explosion ability of the steel box girder bridge.Under the proportional distance of 0.1 m/kg1/3,even if the explosion position remains the same,changing the constraint form from simple support reinforcement to fixed support has almost no influence on the improvement of anti-explosion performance of steel box girder bridge.

关 键 词：钢箱梁桥 爆炸荷载 动力响应机理 关键参数 

分 类 号：U447[建筑科学—桥梁与隧道工程]