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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。
Shanghai Yangtze River Bridge cable beam connection form using steel anchor box anchor structure, steel anchor box anchor structure plate number, complex structure, serious stress concentration, especially in the live load under the action of anti-fatigue performance deserve attention. The finite element method is used to calculate the full-scale test model that can represent the stress in the anchorage zone, and the fatigue test method is introduced. According to the traffic condition and design flow of the bridge, referring to the foreign norms and research results, the cumulative fatigue damage theory is used to determine the fatigue load of the bridge. The calculation shows that the fatigue load caused by the rail transit in the common rail-stayed bridge occupies the main part. Combined with the theoretical analysis and the fatigue test results, the fatigue behavior of steel cable box girder anchorage structure under cyclic loading is studied. The analysis shows that the cable girder anchorage structure of Shanghai Yangtze River Bridge has sufficient safety margin.