苏庆田, 吴 冲, 何武超. 上海长江大桥索梁锚固区疲劳试验研究[J]. 工程力学, 2010, 27(8): 179-184.
引用本文: 苏庆田, 吴 冲, 何武超. 上海长江大桥索梁锚固区疲劳试验研究[J]. 工程力学, 2010, 27(8): 179-184.
SU Qing-tian, WU Chong, HE Wu-chao. MODEL TEST FOR FATIGUE PERFORMANCE OF CABLE-GIRDER ANCHORAGE OF SHANGHAI YANGTZE RIVER BRIDGE[J]. Engineering Mechanics, 2010, 27(8): 179-184.
Citation: SU Qing-tian, WU Chong, HE Wu-chao. MODEL TEST FOR FATIGUE PERFORMANCE OF CABLE-GIRDER ANCHORAGE OF SHANGHAI YANGTZE RIVER BRIDGE[J]. Engineering Mechanics, 2010, 27(8): 179-184.

上海长江大桥索梁锚固区疲劳试验研究

MODEL TEST FOR FATIGUE PERFORMANCE OF CABLE-GIRDER ANCHORAGE OF SHANGHAI YANGTZE RIVER BRIDGE

  • 摘要: 上海长江大桥索梁连接形式采用钢锚箱式锚固结构,钢锚箱式锚固结构板件数量多、构造复杂、应力集中严重,特别是在运营活载作用下的抗疲劳性能值得关注。通过有限元方法计算得到了能够代表锚固区受力情况足尺试验模型,并对疲劳试验方法进行了介绍。根据大桥交通状况与设计流量,参照国外规范和研究成果,由疲劳损伤累积理论,确定试验疲劳荷载取值,计算表明在公轨共用斜拉桥中轨道交通引起的疲劳荷载占主要部分。结合理论分析和疲劳试验结果,研究循环荷载作用下钢锚箱式索梁锚固结构的抗疲劳性能,分析表明上海长江大桥索梁锚固结构具有足够的安全储备。

     

    Abstract: Steel-anchor-box structure is used in the connection between cable and girder of Shanghai Yangtze River Bridge. Due to large quantities of plates being used in this structure, complex configuration and severe stress concentration, the fatigue behavior of the steel-anchor-box subjected to service live loads need a careful investigation. Full scale test model which can represent the mechanical behavior of anchor-zone is obtained by finite element method, and fatigue testing method is introduced. Combining the traffic condition and the design quantity of variable vehicles, referring the foreign code and relative research, the fatigue load range for the test is determined by the theory of cumulative damage in fatigue, and the calculation shows the light rail loadings is the major causes of fatigue effects in cable-stayed bridge burdened the vehicle loadings and light rail loadings on same layer. Based on the theoretical analysis and the result obtained from fatigue test, resistance fatigue behavior of steel-anchor-box structure in the connection of cable-girder subjected to cycle loading is studied. The results show the cable-girder anchorage of Shanghai Yangtze River Bridge is safe enough.

     

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