悬索桥锚碇系统拉杆组件螺母受力性能研究  

Mechanical Performance of Nuts in Tie Rod Assembly of Anchorage System of Suspension Bridge

作　　者：柳正 李钊 秦桂芳 谢钦建 姜远根 张吉勇 王磊 马亚飞 LIU Zheng;LI Zhao;QIN Guifang;XIE Qinjian;JIANG Yuangen;ZHANG Jiyong;WANG Lei;MA Yafei(Guizhou Road and Bridge Group Co.,Ltd.,Guiyang,Guizhou 550001,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]贵州路桥集团有限公司,贵州贵阳550001 [2]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《中外公路》2025年第1期119-128,共10页Journal of China & Foreign Highway

基　　金：国家重点研发计划项目(编号:2021YFB2600900);湖南省自然科学基金创新研究群体项目(编号:2020JJ1006)。

摘　　要：为研究大跨度悬索桥锚碇系统拉杆组件中螺母的受力情况和疲劳性能,首先采用有限元软件Ansys和Abaqus分别建立了全桥模型、拉杆与六角螺母的局部有限元模型;其次,分析了轴向拉伸荷载作用下拉杆与螺母协同受力的全过程变化规律,对比了开槽螺母与未开槽螺母的受力性能差异,对开槽螺母的细部结构参数进行了优化设计;最后,开展了拉杆组件螺母的静力拉伸和疲劳荷载试验,揭示了拉杆组件螺母受力失效机理和破坏模式。研究结果表明:该文提出的有限元数值模拟方法具有可靠性,开槽能降低螺母端口的应力集中效应,比选的3种开槽尺寸参数设计中存在最优方案,静力拉伸荷载作用下拉杆组件均未发生破坏,疲劳荷载作用下以拉杆断裂失效为主要破坏特征,开槽螺母的力学性能更优异,且能满足200万次疲劳寿命设计需求。In order to investigate the stress and fatigue performance of nuts in the tie rod assembly of the anchorage system of a long-span suspension bridge,the finite element software Ansys and Abaqus were used to establish the full bridge model and the local finite element models of the tie rod and the hexagonal nut,respectively.Secondly,the whole process variation law of the synergistic force of the tie rod and the nut under the axial tensile load was revealed.The difference in mechanical performance between slotted nuts and unslotted nuts was compared,and the detailed structural parameters of slotted nuts were optimized.Finally,the static tensile and fatigue load tests of the nut in the tie rod assembly were performed,and the failure mechanism and damage mode of the nut in the tie rod assembly were revealed.The results show that the finite element numerical simulation method proposed in this paper is reliable,and slotting can reduce the stress concentration effect at nut ends.There is an optimal scheme in the three slotting size parameter design schemes.There is no damage to the tie rod assembly under static tensile load.The fracture failure of the tie rod is the main failure feature under fatigue load.The slotted nut has better mechanical performance and can meet the design requirements of 2-million fatigue life.

关 键 词：悬索桥 锚固系统 拉杆 开槽螺母 有限元分析 疲劳 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]