船舶碰撞作用下通航孔桥墩的抗撞性能评估

Impact Resistance Performance Assessment of Bridge Piers in Navigable Holes Under the Action of Ship Impact

针对跨越航道的桥梁水域通航环境复杂,易发生船桥碰撞事故的问题,以某跨江斜拉桥工程实例为对象,对船舶碰撞作用下通航孔桥墩的抗撞性能进行了评估.采用LS-DYNA仿真软件模拟船舶撞击桥墩的过程,获得船舶的撞击力,再计算桥墩在船舶撞击、自重和浮力等荷载组合下的力学响应,并将这些力学响应与桥墩在破坏临界状态下的力学指标进行比较,最终实现了桥墩抗撞性能评估.研究结果表明,28#和30#桥墩墩柱的抗弯、抗剪验算不满足要求,需要进行加固并设置防撞设施.

Considering the complex navigational environment of waterways spanned by bridges,which are prone to ship￣bridge collision accidents,this study evaluates the impact resistance performance of navigational pier columns of a certain cross￣river cable￣stayed bridge project under the action of ship impacts.The LS￣DYNA simulation software is used to model the process of ship impacting on the pier,obtaining the impact force of the ship.Subsequently,the mechanical response of the pier under a combination of loads including ship impact,self￣weight,and buoyancy is calculated,and these responses are compared with the mechanical indicators of the pier in a critical failure state to assess the pier's resistance performance.The evaluation successfully determines the resistance performance of the pier.The study's findings indicate that the bending and shear resistance checks for piers 28#and 30#do not meet the requirements,necessitating reinforcement and the installation of collision protection facilities.