船桥碰撞效应数值分析及动力载荷模型  

Numerical Analysis and Dynamic Load Model of Ship-Bridge Impact Effect

作　　者：兰成坤 唐怀平[1] LAN Chengkun;TANG Huaiping(School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学力学与工程学院,成都610031

出　　处：《四川轻化工大学学报（自然科学版）》2021年第4期59-66,共8页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：国家自然科学基金项目(5177080908)。

摘　　要：船舶撞击桥梁是一个复杂的非线性冲击动力学问题,目前各国桥梁设计规范中船桥碰撞力均被等效为静力载荷,将船桥碰撞力分析过程视为准静态过程是不准确的。本文考虑船桥结构的材料非线性和几何非线性,建立3000 t~12000 t级散货船与预应力钢筋混凝土连续刚构桥碰撞的动力学数值模拟模型,运用显示动力学软件LS-DYNA计算分析不同撞击过程的碰撞力时程曲线,遵循碰撞力峰值、碰撞持续时间等边界条件,得到碰撞力计算所需参数的拟合公式,并基于统计分析方法提出了船桥碰撞的动力载荷模型。根据此荷载模型,易获得给定船舶质量和速度条件下的碰撞力时程曲线。Ship impacting on bridge is a complex nonlinear impact dynamics problem.At present,the collision force of ship and bridge is equivalent to static load in the bridge design codes of various countries,so it is inaccurate to regard the collision force analysis process of ship and bridge as quasi-static process.Considering the nonlinearity of structural materials and geometric nonlinearity of ship and bridge in this paper,a dynamic numerical simulation model for the collision between class 3000 tons to 12000 tons bulk cargo and pre-stressed reinforced concrete continuous rigid frame bridge is established.By using the display dynamics software LS-DYNA to calculate and analyze the time history curve of the collision force in different impact processes,and following the boundary conditions such as the peak value of the collision force and the duration of the collision,the fitting formula of the parameter required for the calculation of the collision force is obtained.Based on the statistical analysis method,the dynamic load model of the ship bridge collision is proposed.According to the load model,it is easy to get the time history curve of collision force under the condition of given ship mass and velocity.

关 键 词：船桥碰撞 碰撞力 动力载荷模型 数值模拟 

分 类 号：U447[建筑科学—桥梁与隧道工程]