常泰长江大桥船撞抗力研究及安全性评估  

Study of Vessel Collision Resistance of Changtai Changjiang River Bridge and Safety Evaluation

作　　者：张景峰 荀非帆 尹震君 苑仁安[3] 方海[4] ZHANG Jingfeng;XUN Feifan;YIN Zhenjun;YUAN Renan;FANG Hai(School of Highway,Chang′an University,Xi′an 710064,China;Jiangsu Provincial Transportation Engineering Construction Bureau,Nanjing 210004,China;China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China;School of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]江苏省交通工程建设局,江苏南京210004 [3]中铁大桥勘测设计院集团有限公司,湖北武汉430056 [4]南京工业大学土木工程学院,江苏南京211816

出　　处：《桥梁建设》2024年第3期78-84,共7页Bridge Construction

基　　金：国家自然科学基金项目(52378477)~~。

摘　　要：为确保常泰长江大桥建设和服役安全,对大桥进行船撞抗力研究及安全性评估。采用单位荷载法计算各涉水下部结构船撞抗力及其船撞破坏控制模式;基于船-桥碰撞概率模型得到各墩碰撞概率,明确常泰长江大桥船撞风险等级,通过对比数值模拟和经验公式计算的船撞力,确定设防船型碰撞各下部结构船撞力;以船撞安全系数和实际防撞吨位为指标进行船撞安全评估。结果表明:1~4号墩船撞破坏模式均由碰撞截面抗剪强度控制,5号和6号塔船撞破坏模式均由基底地基竖向承载力控制;在目前船舶流量下全桥船舶年碰撞概率为1.58次/年,与同类桥梁相比船舶碰撞风险较低且处于安全可控水平,大桥孔跨布置和航道规划合理;全桥涉水下部结构船撞安全系数为1.10~6.54,各下部结构实际防撞吨位均大于相应设防船型吨位,常泰长江大桥涉水下部结构抗船撞性能满足要求。This paper studies the vessel collision resistance of Changtai Changjiang River Bridge and presents the safety evaluations of the bridge.The unit load method was used to calculate the vessel collision resistance of different in-water components of the bridge and figure out vessel collision damage control modes.Based on numerical models,the collision probabilities of all the piers were calculated,the vessel collision risk was rated,and the vessel collision forces acquired by the empirical formulas and numerical simulation were compared,to determine the collision forces on the in-water components by the test vessels.The safety of the bridge was evaluated with the vessel collision safety factor and actual resistances of the piers.As per the analysis,the vessel collision damage modes of piers No.1 to No.4 are governed by the shear strength of the collision cross-section,while those of piers No.5 and No.6 were controlled by the vertical load bearing capacity of the foundation subgrade.Calculated with the current vessel traffic data,the bridge would experience 1.58 collisions per year,lower than those of the bridges of equal navigation capacity,and the collision is controllable,indicating the effective span arrangement and navigation channel planning.The vessel collision safety factors of the in-water components are between 1.10 and 6.54,and the actual collision resistances of the in-water components are larger than the tonnage of test vessels,and the vessel collision resistances of the in-water components of the Changtai Changjiang River Bridge meet the requirements.

关 键 词：桥梁工程 船-桥碰撞 船撞抗力 控制模式 碰撞概率 船撞力 安全性评估 有限元法 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U447[交通运输工程—道路与铁道工程]