环形桥塔侧倾稳定临界荷载的解析计算方法  

Analytical Calculation Method for Critical Load of Lateral Stability of Ring Bridge Towers

作　　者：李俊 陈彪 刘顺发 陈志凯 LI Jun;CHEN Biao;LIU Shunfa;CHEN Zhikai(Guangdong Dadao Testing Technology Co.,Ltd.,Zhongshan Guangdong 528400,China;South China University of Technology,Guangzhou Guangdong 510641,China)

机构地区：[1]广东大道检测技术有限公司,广东中山528400 [2]华南理工大学,广东广州510641

出　　处：《广东公路交通》2024年第3期45-49,73,共6页Guangdong Highway Communications

摘　　要：本文以自锚式悬索桥的环形桥塔为研究对象,基于曲线构件的空间弯扭变形的基本方程,获得环形塔侧倾时的弯扭变形能和荷载作用产生的外力势能,采用能量法推导出了环形桥塔的侧倾失稳临界荷载的解析解,提出了环形桥塔侧倾失稳临界荷载的计算方法。通过实例,将本文的理论计算值与有限元计算结果比较,验证了本文给出的计算方法的正确性。本文还分析了环形桥塔的半径、圆心角和截面刚度等参数的变化对环形桥塔侧倾稳定性的影响,研究结果表明环形桥塔的侧向抗弯对其侧倾稳定性贡献较大,而环形桥塔的半径与圆心角的选取对其侧倾稳定性的影响应获得重视。This article takes the circular bridge tower of a self-anchored suspension bridge as the research object,and based on the basic equation of spatial bending and torsion deformation of curved components,obtains the bending and torsion deformation energy of the circular tower during lateral tilting and the external force potential energy generated by the load.Using the energy method,the analytical solution of the critical load for lateral instability of the circular bridge tower is derived and a calculation method for the critical load is proposed.The theoretical calculation values are compared with the finite element calculation results through examples,which verifies the correctness of the proposed calculation method.This article also analyzes the influence of changes in parameters such as radius,center angle,and section stiffness of the circular bridge tower on its lateral stability.The research results show that the lateral bending resistance significantly contributes to the lateral stability of the circular bridge tower,thus the selection of radius and center angle of the circular bridge tower should be given attention for their influence on lateral stability.

关 键 词：环形桥塔 侧倾稳定 临界荷载 能量法 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]