浮式钢防撞箱受力性能数值分析  

Numerical Simulation of Mechanical Performance for Anti‑Collision Steel Pontoon

作　　者：韩晓磊 王博 李伟东 HAN Xiaolei;WANG Bo;LI Weidong(China Construction Fifth Engineering Division Co.,Ltd.,Changsha,Hunan 410002,China)

机构地区：[1]中国建筑第五工程局有限公司,湖南长沙410002

出　　处：《中外公路》2024年第3期184-192,共9页Journal of China & Foreign Highway

基　　金：中建股份科技研发项目(编号:CSCEC-2021-Z-29)。

摘　　要：浮式钢防撞箱在船桥碰撞中具有良好的塑性吸能防撞性能。为探究影响防撞箱防撞性能的因素,该文基于有限元软件Ansys/LS-DYNA,建立了船-防撞箱-桥墩系统碰撞模型,对碰撞机理及过程进行数值模拟,探讨防撞箱与桥墩连接方式、尖舱尖角、防撞箱刚度等对桥墩所受撞击力的影响,提出撞击力曲线的三阶段划分方法。分析表明:浮式防撞箱内壁直接固结、与桥墩外壁耦合连接会降低撞击力,最大撞击力随着防撞箱与桥墩间距的增大而变大;防撞箱尖舱尖角宜取为80°~100°;防撞箱碰撞区钢板厚度存在一个最优值;最大撞击力随着非碰撞区钢板厚度的增大而变大,超过8 mm增大幅度降低。Anti-collision steel pontoon has good plasticity and energy absorption properties in ship-bridge collision.To explore the factors affecting the anti-collision performance of the anti-collision pontoon,a collision model composed of ship,anti-collision pontoon,and pier system was built based on finite element software Ansys/LS-DYNA.The collision mechanism and process were numerically simulated,and the effects of connection type between anti-collision pontoon and pier,peak angle of pontoon,and anti-collision pontoon stiffness on the collision force of the pier were investigated.The three-stage division method of collision force curve was put forward.The analysis shows that the fixed inwall of the anti-collision steel pontoon and connection to the pier surface can reduce collision force.The maximum collision force increases with the increase in distance between anti-collision pontoon and pier.The appropriate value range of the peak angle of the pontoon is 80°‒100°.The steel plate thickness of the collision zone of the anti-collision pontoon has an optimal value.With the increase in steel plate thickness of the non-collision zone,the maximum collision force will increase,but the increase amplitude will decrease when it exceeds 8 mm.

关 键 词：船桥碰撞 浮式钢防撞箱 撞击力 防撞箱与桥墩连接方式 尖舱夹角 钢板厚度 

分 类 号：U448[建筑科学—桥梁与隧道工程]