摘要
运用结构动力学理论,以材料非线性、几何非线性、接触非线性为基础,同时考虑动水压作用的影响,对跨内河航线某铁路桥梁重力式桥墩结构与900 t级散货船的斜向碰撞过程进行数值仿真。讨论了不同碰撞速度和碰撞角度对碰撞力及应力分布的影响规律,对碰撞过程中墩身、承台与桩基础性的损伤情况进行了评估。分析结果表明:碰撞速度对碰撞力峰值有明显影响且碰撞力随碰撞速度增大而增大;碰撞角度对碰撞力峰值影响较小;碰撞过程中除碰撞区域外,墩顶垫石与上部结构连接区域、墩柱与承台连接区域、桩基础与承台连接区域出现高应力分布情况,易发变形或开裂使桥梁结构出现安全隐患。
On the basis of structural dynamics theory,material nonlinearity,geometric nonlinearity,contact nonlinearity and considering the effect of dynamic water pressure,an oblique collision process of the gravity-type pier structure of a railway bridge over inland river route with a 900 DWT bulk carrier was numerical simulated. With different collision velocities and angles,the time-history curves of ship-pier collision force and stress were described,the damage condition of pier,cushion cap and piles are also evaluated. The analysis results showed that, peak collision force is significantly influenced by the collision velocity and increases with the collision velocity. Collision angle has small effect on the peak collision force. High stress distribution on the collision position,pad stone,piercap connection and pile-cap connection might cause obvious deformation or even cracking that might pose potential safety hazard on the railway bridge.
作者
孙钦东
唐怀平
SUN Qindong;TANG Huaiping(School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《重庆理工大学学报（自然科学）》
CAS
北大核心
2018年第7期67-71,共5页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金资助项目"基于冲击动力学的船桥碰撞效应
损伤识别与防护关键技术研究"(51778548)
关键词
船桥碰撞
斜向碰撞
动力响应
非线性
ship-bridge collision
oblique collision
dynamic response
nonlinearity
