摘要
为了解桩土作用下船桥碰撞时桥墩的受力特性及影响因素,以南京长江三桥北主墩为背景,选取3类共5种桩土模型,采用ANSYS软件建立船桥有限元模型进行碰撞分析。研究不同桩土模型下的船桥碰撞动力性能差异、船舶航速和质量对桥墩船撞动力性能的影响,并比较采用相关经验公式和各国桥梁设计规范评估撞击力时的适用性。结果表明:当船舶航速和船舶质量较小时,3类桩土模型得到的撞击力差异不大;撞击力与船舶航速近似成线性函数关系,与船舶质量成幂函数关系;船桥碰撞动力性能随船舶航速和质量的增加而增大;经验公式与各国桥梁规范中,使用Knott公式计算撞击力较为准确,使用我国铁路桥涵设计规范会导致抗撞评估偏于不安全。
The north main pier of Third Nanjing Changjiang River Bridge is used as a case to study the mechanical property of bridge pier during a ship collision event considering the pile-soil interaction.A number of five pile-soil models of three types were selected.The finite element model was established by ANSYS to analyze the ship-bridge collision.The influence of factors,such as different dynamic behaviors of ship-bridge collision under different pile-soil model,ship speed and ship mass,on the dynamic performance of a pier during a ship collision event was studied.The applicability of empirical equations and bridge design specifications of different countries in assessing the collision force was compared.The results indicate that when the speed and mass of the ship are small,the collision forces gained from three types of pile-soil models show no significant difference.The collision force is approximately in linear relation with the ship speed and in exponential relation with the ship mass.Bigger speed and mass of ship lead to stronger dynamic responses of the bridge during a ship collision event.Among the empirical equations and the bridge specifications of different countries,the collision forces calculated by the Knott equation are with higher accuracy.However,if the Chinese railway bridge and culvert design specification is referenced,the collision resistance would be underestimated.
作者
王贵春
吉喆
李武生
岳凯乐
WANG Gui-chun;JI Zhe;LI Wu-sheng;YUE Kai-le(School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;SIPPR Engineering Group Co. , Ltd. , Zhengzhou 450007, China)
出处
《桥梁建设》
EI
CSCD
北大核心
2021年第4期17-24,共8页
Bridge Construction
基金
国家自然科学基金青年资金资助项目(51408554)。
关键词
船桥碰撞
桩土作用
撞击力
船舶航速
船舶质量
动力性能
有限元法
经验公式
ship-bridge collision
pile-soil interaction
collision force
ship speed
ship mass
dynamic property
finite element analysis
empirical formula
