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为了提高桁梁荷载能力,有的钢桁梁不但在下部设计下承式支撑,还在上部设计有肋拱。九江长江大桥(1996-22-3,图18)
In order to improve the truss girder load capacity, some steel truss not only under the design of the bearing support, but also in the upper design ribbed arch. Jiujiang Yangtze River Bridge (1996-22-3, Figure 18)