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极限荷载作用下大跨度斜拉桥的非线性效应极为突出,进行该类桥梁极限承载力分析时其影响不容忽视。该文以芜湖长江公路二桥为例,结合其大跨径、四索面、分体式钢箱梁的结构特点,详细分析了其极限承载力性能,考虑了梁与索的材料非线性及几何非线性的影响,比较了不同荷载分布方式的影响,分析了不同荷载分布时结构的破坏路径。研究结果表明:考虑双重非线性计算得到的极限承载力值更符合实际情况;不同荷载分布方式对该桥极限承载力影响较大;斜拉索的材料非线性在该桥的极限承载力分析中不容忽视;结构主要是由于跨索的断裂或主梁出现塑性铰导致破坏。
The nonlinear effect of long-span cable-stayed bridges under extreme loads is extremely prominent. The influence of such loads on the ultimate bearing capacity of bridges should not be neglected. Taking the Second Bridge of Wuhu Changjiang River Road as an example, this paper analyzes the structural characteristics of its large-span, four-cable plane and split steel box girder, analyzes its ultimate bearing capacity in detail, and considers the material nonlinearity and geometry The influence of different load distribution is compared. The failure path of the structure under different load distribution is analyzed. The results show that considering the limit value of the double nonlinear calculation is more in line with the actual situation. Different load distributions have a great influence on the ultimate bearing capacity of the bridge. In the analysis of the ultimate bearing capacity of the bridge, Can not be ignored; the structure is mainly due to the failure of the cross-cable or the plastic hinge of the main girder.