正交异性钢桥面板U肋对接焊缝疲劳寿命评估
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
基于江阴长江大桥U肋对接焊缝实时动态应变监测,结合雨流计数法以及BS5400规范,对江阴长江大桥正交异性钢桥面板U肋对接焊缝疲劳寿命进行了研究。通过标准车辆荷载模型以及车流仿真模拟,获得移动车辆荷载作用下焊缝处的应力变化,进行了损伤度计算,并将数值计算与实测分析结果作了详细对比。实测结果表明:慢车道与快车道应力幅分别为70与110 MPa,均超过了该部位的疲劳极限值,随着疲劳损伤累计可能发生破坏。计算结果显示车辆经过桥面时焊缝处产生了较大的应力幅,但以损伤累计以低循环累计为主。慢车道U肋对接焊缝处疲劳寿命低于大桥设计寿命,应当及时给予关注。
The fatigue life of U-rib butt weld of orthotropic steel bridge deck of Jiangyin Yangtze River Highway Bridge was researched,which was based on real-time monitoring of dynamic strain of U-rib butt weld on the Jiangyin Yangtze River Highway Bridge,with the consideration of the rain-flow counting method and BS5400 specification. The stress variation of U-rib butt weld with the load of moving vehicle was obtained by using the fatigue-loaded vehicle model and the traffic flow simulation. The fatigue damage degree was calculated,and the calculation results were compared with the measured ones in detail. The measured results show that the maximum stress amplitude of the slow traffic lane and the fast traffic lane both exceed the fatigue limit of U-rib,which is 70 and 110 MPa respectively,which may cause failure with the accumulation of the fatigue damage. The FEM result shows that although large stress amplitude is produced when the vehicle passes through the bridge,the damage accumulation is mainly in low cycle. The fatigue life of the U-rib which locates on the slow lane is lower than that of the designed bridge life. So it is important to pay attention to the U-ribs of the slow lane.
引文
[1]田洋,李运生,张彦玲,等.高速铁路正交异性桥面板疲劳细节的应力分析[J].重庆交通大学学报:自然科学版,2011,30(4):729-733.Tian Yang,Li Yunsheng,Zhang Yanling,et al.Stress analysis of fatigue details of deck of orthotropic bridges in high-speed railway[J].Journal of Chongqing Jiaotong University:Natural Science,2011,30(4):729-733.
    [2]田洋,李运生,张德莹,等.正交异性板U肋与桥面板焊缝连接的静力及疲劳试验研究[J].铁道科学与工程学报,2011,8(2):34-39.Tian Yang,Li Yunsheng,Zhang Deying,et al.Static and fatigue research on welded rib-to-deck connections in steel orthotropic bridge deck[J].Journal of Railway Science and Engineering,2011,8(2):34-39.
    [3]Harting D R.The-S/N-fatigue-life gage:A direct means of measuring cumulative fatigue damage[J].Experimental Mechanics,1966,6(2):19A-24A.
    [4]胡明敏,周克印.疲劳寿命计电阻变化机理的研究[J].航空学报,1999,20(1):72-74.Hu Mingmin,Zhou Keyin.Study on mechanism of resistance change of fatigue life gage[J].Acta Aeronautica et Astronautica Sinica,1999,20(1):72-74.
    [5]王超,钟继卫,朱宏平.基于健康监测系统实测应力的钢箱梁疲劳评估[J].武汉理工大学学报,2012,34(12):103-107.Wang Chao,Zhong Jiwei,Zhu Hongping.Fatigue assessment of steel box girder based on measured stress of health monitoring system[J].Journal of Wuhan University of Technology,2012,34(12):103-107.
    [6]曾志斌.正交异性钢桥面板典型疲劳裂纹分类及其原因分析[J].钢结构,2011,26(2):9-15.Zeng Zhibin.Classification and reasons of typical fatigue cracks in orthotropic steel deck[J].Steel Construction,2011,26(2):9-15.
    [7]曾勇,向中富,于福,等.大跨度悬索桥钢加劲梁典型病害及维修策略[J].重庆交通大学学报:自然科学版,2012,31(增刊1):700-709.Zeng Yong,Xiang Zhongfu,Yu Fu,et al.Typical diseases and maintenance strategies for steel girder of large-span suspension bridge[J].Journal of Chongqing Jiaotong University:Natural Science,2012,31(S1):700-709.
    [8]周太全,郭力,陈鸿天.香港青马大桥在交通荷载作用下的疲劳评估[J].地震工程与工程振动,2002,22(5):25-29.Zhou Taiquan,Guo Li,Chen Hongtian.Fatigue evaluation of TsingMa Bridge subjected to traffic loading[J].Earthquake Engineering and Engineering Vibration,2002,22(5):25-29.
    [9]Cuninghame J R.Fatigue Classification of Welded Joints Orthotropic Steel Deck Bridge[R].Berkshire:Transport and Road Research Laboratory,1990.
    [10]BS 5400-10-1980 Steel,Concrete and Composite Bridges:Part 10:Code of Practice for Fatigue[S].British:British Standards Institution,1980:1600-1603.
    [11]王春生,冯亚成.正交异性钢桥面板的疲劳研究综述[J].钢结构,2009,24(9):10-13.Wang Chunsheng,Feng Yacheng.Review of fatigue research for orthotropic steel bridge deck[J].Steel Construction,2009,24(9):10-13.
    [12]吕磊,吉伯海,马麟,等.基于实测车流的大跨度悬索桥振动响应研究[J].土木工程学报,2011,44(增刊1):102-108.Lv Lei,Ji Bohai,Ma Lin,et al.Study on the vibration response of long span suspension bridge based on the measured traffic flow[J].China Civil Engineering Journal,2011,44(S1):102-108.
    [13]Fujino Y,Bhartia B K,Manabu I.A stochastic study on effect of multiple track presence on fatigue damage of highway bridges[J].Structural Engineering&Earthquake Engineering,1986,3(2):457-467.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心