船桥碰撞系统的简化力学模型及动力分析  

Simplified mechanical model and dynamic analysis of ship bridge collision system

作　　者：韩娟[1] 刘伟庆[1] 王君杰[2] 方海[1] 冒一锋[1] 祝露[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009 [2]同济大学土木工程学院,上海200092

出　　处：《南京工业大学学报（自然科学版）》2015年第4期85-91,共7页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51008157)

摘　　要：综合分析桥墩的弯曲、剪切、转动惯量、上部结构约束以及地基基础约束等因素,提出比较接近实际受力情况的船桥碰撞系统的简化力学模型;对力学模型进行简化动力分析,基于分布质量的弹性体理论以及经典的结构力学原理推导了桥墩的偏微分运动方程,并联合控制条件采用积分变化的方法进行求解,通过数值反演,得出时域内的船撞力;对桥墩刚度这一影响因素进行了参数分析,分析表明在一定范围内桥墩刚度对船撞力影响比较明显。文中还指出桥船相对刚度对峰值撞击力的作用更能反映碰撞的本质,当桥船相对刚度<50时,峰值撞击力随着桥船相对刚度的增大成对数函数增长,当桥船相对刚度≥50时,峰值撞击力可近似按欧洲统一规范求取。Though analyzing the influences of bending,shear,rotational inertia of pier and the constraint of the upper structure and the foundation,a simplified mechanical model of ship bridge collision system was established,which was more corresponding to actual situation. Based on the theory of elastomer with distributional quality and classical mechanics principles,the partial differential equation of pier was derived. Solved it by integral transform method referring to the governing equation. Then,the impact forces and various dynamic responses in time domain were obtained. By analyzing the relationship between the stiffness of pier and the peak impact force,it indicated that the effects of stiffness on pier were remarkable obvious within certain limits. The analysis results showed that the impact force was affected by the relative stiffness between the ship and the bridge,it reflected the impact nature. The results indicated that when ship bridge relative stiffness was less than 50,the peak impact force shall increase with the ship bridge relative stiffness following a logarithmic function,when ship bridge relative stiffness is more than50,the peak impact force could be calculated based on the European Code.

关 键 词：船桥碰撞 简化力学模型 桥墩刚度 船撞力 桥船相对刚度 

分 类 号：TU997[建筑科学—市政工程]