大高差超高墩连续刚构桥受力特性研究  

RESEARCH ON THE STRESS CHARACTERISTICS OF CONTINUOUS RIGID FRAME BRIDGES WITH LARGE HEIGHT DIFFERENCES AND ULTRA-HIGH PIERS

作　　者：邹兰林[1] 宋伟伟 ZOU Lan-lin;SONG Wei-wei(School Automobile and Traffic Engineering,Wuhan University of Science and Technology,430081,Wuhan,China)

机构地区：[1]武汉科技大学汽车与交通工程学院,武汉430081

出　　处：《建筑技术》2025年第7期831-835,共5页Architecture Technology

摘　　要：以某4跨连续刚构桥为例,研究当桥墩高差较大时连续刚构桥的受力特性。研究发现,4跨连续刚构桥的受力主要集中在两个边墩上。温度荷载对桥梁影响较大,温升与温降对桥梁的作用完全相反,系统降温对桥梁的影响可通过系统升温反映。桥梁在温度变化和荷载作用下会向较高一侧产生较大位移,导致较高一侧桥墩承受较大弯矩、剪力和自身重力。中间主高墩对桥梁的纵向变形适应性较好,但会导致较大的横向位移,影响行车舒适性。高墩使用变截面可以改善桥梁弯矩差、减小高墩应力、提高桥墩刚度,有利于桥梁的线形控制和长期运营。研究结果可对类似桥梁的设计和计算提供参考。In this paper,a 4-span continuous rigid frame bridge is taken as an example to study the mechanical characteristics of the continuous rigid frame bridge when the height difference of the piers is large.It is found that when the height difference of the bridge piers is large,the stress of the 4-span continuous rigid frame bridge is mainly concentrated on the two side piers.The temperature load has a great influence on the bridge,and the effect of temperature rise and temperature drop on the bridge is completely opposite,and the effect of system cooling on the bridge can be reflected by the system temperature rise.Under the action of temperature change and load,the bridge will produce a large displacement to the higher side,resulting in a large bending moment,shear force and its own gravity on the higher side of the pier.The middle main high pier has good adaptability to the longitudinal deformation of the bridge,but it will lead to a large lateral displacement and affect the driving comfort.The use of variable cross-section can improve the bending moment difference,reduce stress,and improve the stiffness of the pier,which is conducive to the linear control and long-term operation of the bridge.These results provide a reference for the design and calculation of similar bridges.

关 键 词：连续刚构桥 变截面 线形控制 弯矩差 

分 类 号：TU74[建筑科学—建筑技术科学]