摘要
为保证广州明珠湾大桥主桥疲劳性能及寿命满足要求,根据该桥正交异性钢桥面板设计尺寸和构造,采用与施工现场相同焊接条件,制作8个足尺单U肋模型并进行疲劳试验,确定桥面板的疲劳破坏关注点及其疲劳寿命曲线;建立桥面板有限元模型,分析实际车辆荷载作用下桥面板的疲劳力学性能,并根据名义应力法确定该桥钢桥面板的疲劳寿命。结果表明:桥面板U肋与顶板焊接位置、U肋与横隔板围焊位置为疲劳易损部位,循环次数为5×106次时,两处常幅疲劳极限分别为42.04 MPa和60.30 MPa;桥面板U肋与顶板焊接位置最大应力幅为14.02 MPa,小于常幅疲劳极限,可不考虑疲劳寿命;U肋与横隔板围焊位置最大应力幅为64.73 MPa,大于常幅疲劳极限,桥面板疲劳寿命为158年,满足大桥设计基准期100年的要求。
Eight full-scale single-U-rib specimens were prepared for fatigue test to study the fatigue performance and evaluate the fatigue life of the orthotropic steel deck of the main bridge of Mingzhu Bay Bridge in Guangzhou.The specimens were fabricated in accordance with the design dimensions and structural details of the real bridge as well as the same site welding conditions.The fatigue failure vulnerable points and fatigue life curve of the deck were determined.Numerical simulation was conducted to analyze the fatigue behavior of the deck under actual vehicle loads,and the nominal stress method was used to predict the fatigue life the deck.The results demonstrate that the U rib-to-deck joints and the U rib-to-diaphragm joints are the fatigue vulnerable points,at 5 million cycles,the normal fatigue limits of the two locations are 42.04 MPa and 60.30 MPa,respectively.The maximum stress range of the U rib-to-deck joint is 14.02 MPa,less than the normal fatigue limit,the fatigue life is not a concern.The maximum stress range of the U rib-to-diaphragm joint is 64.73 MPa,greater than the normal fatigue limit,the fatigue life is predicted to be 158 years,exceeding the bridge design life of 100 years.
作者
刘朋
陈艺旋
赵健
安路明
王元清
LIU Peng;CHEN Yixuan;ZHAO Jian;AN Luming;WANG Yuanqing(School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang 110023,China;China Railway Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China;School of Civil Engineering,Tsinghua University,Beijing 100084,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第6期41-46,共6页
Bridge Construction
基金
天津市科技开发计划项目(19YDLZSF00030)
中国铁建大桥工程局集团有限公司科技研究开发课题(DQJ-2018-A01)
辽宁省教育厅高等学校基本科研项目(LJKMZ20220487)。
关键词
正交异性钢桥面板
构造细节
疲劳性能
疲劳寿命
疲劳试验
名义应力法
orthotropic steel deck
structural details
fatigue performance
fatigue life
fatigue test
nominal stress method
