悬索桥桥塔纵桥向稳定计算方法  

Calculation Method of Longitudinal Stability of Suspension Bridge Tower

作　　者：邱鹏 沈锐利[1] QIU Peng;SHEN Ruili(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《铁道建筑》2023年第7期73-78,共6页Railway Engineering

摘　　要：为解决悬索桥桥塔纵桥向弹性稳定在理论计算时简化分析精度问题,与现有研究中桥塔边界约束刚度取值过大不同,本文将主缆对悬索桥塔顶的作用以及地基基础对塔底的约束作用分别简化为水平弹簧和抗扭弹簧,采用瑞利-里兹法建立了一种精度较高的悬索桥桥塔纵桥向稳定性解析计算方法,讨论自重对桥塔纵向稳定性的影响。以一座两塔单跨公路悬索桥为例,通过对比解析公式与有限元法计算结果,验证该公式的可靠性。结果表明:桥塔纵向稳定性受桥塔自身刚度与弹性支撑刚度比值影响显著;本文推导的计算公式具有较高的精度;钢桥塔稳定性影响因素中自重作用影响较小,塔底转动约束影响较大。In order to solve the problem of simplifying the analysis accuracy of the longitudinal elastic stability of suspension bridge tower in the theoretical calculation,different from the excessive value of the boundary constraint stiffness of the tower in the existing research,the effect of the main cable on the top of the suspension bridge tower and the constraint effect of the foundation on the bottom of the tower were simplified to horizontal spring and torsional spring respectively,and an analytical calculation method with high accuracy for the longitudinal stability of the tower of the suspension bridge was established by using the Rayleigh-Ritz method to discuss the influence of the dead weight on the longitudinal stability of the tower.Taking a double-tower single-span highway suspension bridge as an example,the reliability of the formula was verified by comparing the calculation results of the analytical formula and the finite element method.The results show that the longitudinal stability of the bridge tower is significantly affected by the ratio of the tower's own stiffness to the stiffness of the elastic support.The calculation formula derived in this paper has high accuracy.Among the factors affecting the stability of steel bridge towers,the influence of dead weight is relatively small,while the influence of tower bottom rotation constraint is significant.

关 键 词：公路桥梁 解析方法 理论分析 桥塔纵向稳定 瑞利-里兹法 弹性约束 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]