长沙暮坪湘江特大桥主桥抗撞性能研究与防撞设计  

Collision Resistance and Protection Design of Main Bridge of Muping Xiangjiang River Bridge in Changsha

作　　者：常柱刚 魏标[1] 樊伟[3] 户东阳[4] CHANG Zhugang;WEI Biao;FAN Wei;HU Dongyang(School of Civil Engineering,Central South University,Changsha 410075,China;Changsha Planning and Design Institute Co.,Ltd.,Changsha 410007,China;School of Civil Engineering,Hunan University,Changsha 410082,China;Kunming Survey,Design and Research Institute of CREEC,Co.,Ltd.,Kunming 650200,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]长沙市规划设计院有限责任公司,湖南长沙410007 [3]湖南大学土木工程学院,湖南长沙410082 [4]中铁二院昆明勘察设计研究院有限责任公司,云南昆明650200

出　　处：《桥梁建设》2024年第1期117-124,共8页Bridge Construction

基　　金：国家自然科学基金项目(52278547);湖南省杰出青年科学基金项目(2022JJ10079)。

摘　　要：为保证长沙暮坪湘江特大桥主桥船-桥碰撞安全性,对该桥进行了抗撞性能研究与防撞设计。采用LS-DYNA软件开展船-桥碰撞分析,确定设防船撞力;结合冲击谱近似方法确定设防船撞动力作用,计算桥墩动力需求与抗撞能力,评估结构安全性;针对主墩拱脚防护及过渡墩抗弯能力不足等问题,提出由UHPC面板、内置X型耗能钢板、EPS泡沫及D型防撞护舷等构成的钢-UHPC组合防撞设计方案,并开展防撞效果有限元分析。结果表明:除撞击力峰值外,最高水位工况下结构响应均大于最低水位工况;未设置防撞装置时主墩具有较好的抗撞能力,且有一定的安全富余,而过渡墩无法满足抗弯需求;主墩设置防撞装置能在1.5 s内将船舶侧撞速度降为0,有效地阻止了船舶侧向侵入,过渡墩防撞装置钢板厚10 mm时,撞击力峰值降低了35%,主要响应峰值降幅达40%~50%。This study presents the collision resistance research and collision protection design of the main bridge of Muping Xiangjiang River Bridge in Changsha.The vessel-bridge collision analysis of the bridge was conducted in LS-DYNA software to determine the collision protection degree of the bridge.Combined with the shock spectrum approximation method,the dynamic responses of the bridge to vessel collision were simulated,the required dynamic performance as well as the collision resistant capacity of the pier was calculated to evaluate the safety of the bridge structure.Considering the insufficient protection of the arch springing and anti-bending performance of the transition pier,a steel-UHPC composite collision protection fender that consists of UHPC walls,inside X-shaped energy-dissipating steel plates,D-shaped collision protection barriers and EPS foam was proposed.The collision resistant behavior of the fender was numerically simulated.The results demonstrate that the structural responses of the bridge under the maximum water level are more significant than those under the minimum water level,exclusive of the peaks of the collision forces.Without the collision protection fender,the main pier has great collision resistant capacity and a degree of safety margin,while the transition pier does not reach the anti-bending requirements.The fender is able to decelerate the impacting speed of a vessel to zero within 1.5 s and effectively prevent the lateral intrusion of the vessel.With a thickness of 10 mm,the inside energy-dissipating steel plates are capable of suppressing 35%of the peak vessel impact force,while allowing the primary peak responses of the bridge to reduce by 40%to 50%.

关 键 词：桥梁工程 船-桥碰撞 撞击力 抗撞性能 安全性 钢-UHPC组合 防撞设计 

分 类 号：U443.26[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]