摘要
梁-拱组合刚构桥是一种新桥型,船撞研究较少。该文以礼嘉嘉陵江大桥为工程背景,研究大跨度上承式梁-拱组合刚构桥梁的船撞力标准值和抗撞性能。首先确立了代表船型和船撞计算工况,利用ANSYS/LS-DYNA非线性有限元瞬态动力软件模拟了单墩模型在各工况下船桥碰撞过程,并对比了船撞力有限元仿真结果与多种经验公式计算结果。最后利用全桥模型和验算截面的极限承载力反推得到桥墩的极限抗船撞力,对桥墩的抗撞性能进行了评估。结果表明:船撞力具有很强的非线性波动特征,船艏最大撞深发生时刻滞后于最大撞击力发生时刻,船桥碰撞过程中的系统能量主要是由船舶动能转化为船艏局部变形内能;不同的船撞力经验公式的计算结果相差较大,推荐采用动力仿真模拟值;极限抗船撞力验算结果表明礼嘉嘉陵江大桥主墩的抗撞性能满足要求。
Beam-arch composite rigid frame bridge is a new bridge type,and it has few vessel collision studies.By taking the Lijia Jialing River Bridge as the engineering background,the standard value of vessel collision force and anti-collision performance of the long-span beam-arch composite rigid frame bridge were studied.After determining the representative vessel type and vessel collision calculation conditions,the vesselbridge collision processes of the single-pier models under various calculation scenarios were simulated by using ANSYS/LS-DYNA nonlinear finite element transient dynamic software.The simulation results of collision forces were compared with the results of several empirical formulas.Finally,the full bridge model and the ultimate bearing capacity of the checked section were used,and the ultimate anti-collision force of the piers was obtained.Then,the anti-collision performance of the pier was evaluated.The results show that the vessel collision forces have a strong nonlinear fluctuation feature;the time when the maximum collision depth occurs lags behind the time when the maximum collision force occurs;the system energy during the vessel-bridge collision is mainly converted from the vessel kinetic energy to the internal energy of the local deformation of the bow.The results of different empirical formulas of vessel collision force vary greatly,and the dynamic simulation values are recommended.The checking results of the ultimate anti-collision force show that the anticollision performance of the main piers of the Lijia Jialing River Bridge meets the requirements.
作者
张文明
王志伟
赖亚平
ZHANG Wenming;WANG Zhiwei;LAI Yaping(School of Civil Engineering,Southeast University,Nanjing,Jiangsu 211189,China;T.Y.Lin International Engineering Consulting(China)Co.,Ltd.,Chongqing 401121,China)
出处
《中外公路》
2024年第5期132-142,共11页
Journal of China & Foreign Highway
基金
国家重点研发计划项目(编号:2022YFB3706703)
国家自然科学基金资助项目(编号:52078134,52378138)。
关键词
梁-拱组合刚构
船桥碰撞
船撞力
抗撞性能
有限元法
经验公式
beam-arch composite rigid frame
vessel-bridge collision
vessel collision force
anti-collision performance
finite element method
empirical formula
