超宽混凝土主梁斜拉桥空间受力分析

Spatial Force Analysis of Super-Wide Concrete Girder Cable-Stayed Bridge

为了研究超宽混凝土主梁斜拉桥空间受力影响规律,利用桥梁结构分析软件建立全桥有限元模型,调整索力以确定合理成桥状态,对结构空间受力特点进行分析.结果表明:成桥状态下主梁存在一定的下挠变形,主跨跨中最大变形是边跨的3. 65倍;主梁结构受力合理,截面均处于受压状态,塔梁固结处存在负弯矩,对主梁跨中正弯矩具有卸载效果;成桥状态下主梁应力和变形横向分布不均,超宽混凝土主梁斜拉桥空间效应明显.

In order to study the influence law of space stress on super-wide concrete main girder cable-stayed bridge, a full-bridge finite element model was established by using bridge structural analysis software. The cable forces were adjusted to determine the state of rational bridge formation and the structural space force characteristics were analyzed. The results show that the main girder has some deformation at the completion of the bridge, and the maximum deformation of the main span is 3.65 times that of the side span. The main girder structure is under reasonable force and the sections are under pressure. There is a negative bending moment at the consolidation of the tower girder, which has an unloading effect on the positive bending moment of the main girder. At the completion of the bridge, the stress distribution and deformation of the main girder are unevenly distributed. The spatial effect of the super-wide concrete girder cable-stayed bridge is obvious.