施工期台风浪作用下沉箱碰撞破坏分析  

Pounding damage analysis of caissons during construction under action of storm wave

作　　者：陈宇 孙熙平[1] 李越松[1] CHEN Yu;SUN Xiping;LI Yuesong(Key Laboratory of Harbor&Marine Structure Safety,Ministry of Transport,Tianjin Research Institute for Water Transport Engineering,MOT,Tianjin 300456,China)

机构地区：[1]交通运输部天津水运工程科学研究所水工构造物检测诊断与加固技术交通行业重点实验室,天津300456

出　　处：《水利水运工程学报》2018年第4期112-118,共7页Hydro-Science and Engineering

基　　金：国家重点研发计划项目(2016YFC0802204-1;2016YFC0802209);中央级公益性科研院所基本科研业务费专项资金资助项目(TKS170109;TKS150204)

摘　　要：以"莎莉嘉"台风引起施工期沉箱碰撞破坏为背景,研究台风浪作用下施工期沉箱碰撞破坏模式及机理。提出基于台风浪作用下沉箱碰撞反应分析两步走的数值模拟方法,该方法利用高精度流体模拟软件Flow-3D的造波技术模拟台风引起的波浪传播过程,并与沉箱结构作用获取沉箱波浪力时程曲线;建立沉箱精细化有限元模型,将上述波浪力时程曲线施加于沉箱结构,利用LS-DYNA显式求解器分析沉箱结构的碰撞反应。应用该方法对"莎莉嘉"台风引起施工期沉箱碰撞破坏进行分析,结果表明:数值模拟的沉箱结构在不同波浪方向作用下发生不同角度的碰撞会导致不同的沉箱碰撞破坏模式,波浪作用方向与沉箱前后壁夹角为60°时,沉箱碰撞破坏模式与"莎莉嘉"台风作用期间的现场情况吻合较好。The studies and analysis of the pounding damage mode and the mechanism of the caisson during construction under the action of storm waves are carried out based on the pounding damage of the caisson during construction caused by the super typhoon Sarika.In this paper,a new method for the numerical analysis of a structural model is proposed,and is employed to analyze the pounding response of the caissons subjected to the storm wave loads.According to the new method,the simulation process is divided into two steps.In the first step,the wave propagation caused by the typhoon is simulated by the wave-generating tool of Flow-3D,and the time history of the wave force on the caissons is also recorded at the same time.In the second step,a refined finite element model is developed in analyzing the pounding response of the caissons under the action of storm waves,and the wave force time-story curves are applied to the caissons according to the measured data in the first step for further analysis of the structural pounding response using the explicit solver of LSDYNA.The whole simulation of the pounding response of the caissons during construction caused by typhoon Sarika is carried out.The simulated and analysis results show that the different wave direction results in the angle of the caisson collisions,which will lead to different damage modes for the caissons.And when the angle between the wave action direction and the front/back walls of the caisson is 60°,the measured pounding damage mode is in a good agreement with the field situation caused by the typhon Sarika.

关 键 词：沉箱 台风 波浪 碰撞 破坏模式 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]