缆塔自平衡体系悬索桥桥塔非线性稳定性研究  

Research on Nonlinear Stability of Towers of Suspension Bridge of a Main Cable-Tower Self-Balancing System

作　　者：刘高 温佳年 陈上有 杨怀茂 LIU Gao;WEN Jianian;CHEN Shangyou;YANG Huaimao(School of Civil Engineering,Southeast University,Nanjing 211189,China;CCCC National Engineering Research Centre of Long Highway Bridge Construction Co.,Ltd.,Beijing 100120,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189 [2]中交公路长大桥建设国家工程研究中心有限公司,北京100120

出　　处：《桥梁建设》2025年第2期80-85,共6页Bridge Construction

基　　金：中交集团院士专项科研项目(YSZX-01-2021-01-B)。

摘　　要：为充分了解缆塔自平衡体系悬索桥桥塔的非线性稳定性,以某该类型超大跨悬索桥为背景,采用OpenSees有限元软件建立考虑边界非线性、材料非线性和几何非线性的桥塔稳定性分析模型,分析桥塔在恒载+活载、恒载+活载+运营纵风等5种荷载组合工况下的线性稳定性、边界非线性+几何非线性+材料非线性的多重非线性稳定性。结果表明:所建立的桥塔稳定性模型能够考虑边界非线性+几何非线性+材料非线性影响,计算效率高,适合实际工程应用;考虑边界非线性、几何非线性及材料非线性的稳定性分析中,竖向荷载系数大于屈服荷载系数时,竖向荷载系数~塔顶水平位移曲线逐渐平缓,呈现出强非线性;桥塔失稳模式主要为横向失稳,多重非线性稳定性系数相较于线性稳定性系数减小约75%;缆塔自平衡体系悬索桥桥塔稳定性由恒载+百年横风工况控制,失稳方向为横向,在实际设计中应考虑材料非线性对结构稳定性的影响。This study investigates the nonlinear stability of towers of the suspension bridge of a main cable-tower self-balancing system.An existing long-span suspension bridge is used as a case.A tower stability analysis model was built in OpenSees,to analyze the linearity stability and multiple nonlinearity stability(linearity stability and boundary nonlinearity+geometry nonlinearity+material nonlinearity)of the towers under the actions of dead and live loads as well as the dead,live and longitudinal wind loads at service stage.The results demonstrate that the tower stability analysis model established considers the influences of boundary nonlinearity,geometry nonlinearity and material nonlinearity,with high calculation efficiency,which is applicable to real engineering.In the stability analysis considering the boundary nonlinearity,geometry nonlinearity and material nonlinearity,as the vertical load coefficient is greater than the yield load coefficient,the curve of vertical load coefficient and tower-top horizontal displacement gradually flattens,revealing strong nonlinearity.The transverse instability mode plays a dominant role,the multiple nonlinear stability coefficient is reduced by 75%,compared with the linearity stability coefficient.The stability of the suspension bridge of a main cable-tower self-balancing system is controlled by dead loads and crosswinds with a return period of 100 years.The failure occurs and develops along the transverse direction,and the influence of material nonlinearity on the structural stability should be considered in the actual design.

关 键 词：悬索桥 桥塔 缆塔自平衡体系 非线性稳定性 稳定性系数 失稳模态 有限元法 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U443.38[交通运输工程—道路与铁道工程]