摘要
以某大跨度斜拉桥为背景,基于Midas Civil建立有限元模型,模拟不同位置拉索损伤及车辆荷载作用,结合温度、风荷载工况分析损伤对主梁挠度差的影响规律。通过雨流计数法、Miner线性累积损伤理论及古德曼修正公式,计算拉索疲劳累积损伤、寿命与可靠度。结果表明:损伤程度增加导致累积损伤量上升,疲劳寿命递减;所有工况下疲劳可靠度指标均大于4.0,满足规范要求;主梁最大挠度差峰值集中于受损拉索锚固点,且随损伤程度加剧而增大。研究揭示了拉索损伤与主梁变形的定量关系,为桥梁安全评估提供理论依据。
A long-span cable-stayed bridge was taken as the background and a finite element model based on Midas Civil was built to simulate cable damage and vehicle load at different positions,and the law of the influence of damage on the deflection difference of the main beam combined with temperature and wind load conditions was analyzed.The cumulative fatigue damage,life and reliability of cable were calculated by the rain-flow counting method,Miner's linear cumulative damage theory and Goodman’s modified formula.The results show that the cumulative damage increases and the fatigue life decreases with the increase of damage degree.The fatigue reliability index under all working conditions is greater than 4.0,which meets the specification requirements.The peak value of the maximum deflection difference of the main beam is concentrated at the anchorage point of the damaged cable and increases with the increase of the damage degree.The quantitative relationship between cable damage and girder deformation is revealed,which provides theoretical basis for bridge safety assessment.
作者
谭冬梅
陶雨
李文洁
杨家驹
吉柏锋
TAN Dong-mei;TAO Yu;LI Wen-jie;YANG Jia-ju;JI Bai-feng(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572025,China)
出处
《武汉理工大学学报》
2025年第3期1-8,共8页
Journal of Wuhan University of Technology
基金
国家自然科学基金(42271453)
海南省科技计划三亚崖州湾科技城自然科学基金联合项目(2021JJLH0011)
关键词
斜拉桥
雨流计数法
疲劳损伤
疲劳可靠度
有限元模型
cable-stayed bridge
rain-flow counting method
fatigue damage
fatigue reliability
finite element model
