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在箱形钢梁桥、板桁联合系桥以及其它类型的钢桥设计中,采用以纵、横肋加强的正交异性钢桥面板(图1—a)可显著减轻桥梁的自重,获得明显的经济效果,这已为近三十年来的桥梁工程实践所证明。在荷载作用下,这种桥面板不仅起着将荷载传给主梁的作用,而且直接参与抵抗桥梁整体的弯曲和扭转。这就是说,桥面板在荷载作用下将同时受弯扭和法向压力(如为连续梁则在支点近处的上翼缘将受到拉力)的联合作用。在对桥面板结构进行分析时,我们应该注意到板的这些受力特点。
In box girder bridge, truss bridge and other types of steel bridge design, the use of longitudinal and transverse ribs strengthened orthotropic steel bridge deck (Figure 1-a) can significantly reduce the weight of the bridge to obtain significant The economic effect, which has been proved by the bridge engineering practice in the past three decades. Under the action of load, the bridge deck not only plays the role of transmitting the load to the main girder, but also directly participates in the bending and torsion of the whole bridge. This means that the bridge deck will be subjected to the combined action of both bending and normal pressure under load (for example, the upper flange of the continuous beam will be subjected to tension near the fulcrum). When analyzing the deck structure, we should note these stress characteristics of the deck.