上海长江大桥主桥斜拉桥双箱梁节段的三维空间屈曲

上海长江大桥主通航孔桥斜拉桥的桥面结构为中间箱形联系梁连接的分离式双箱梁钢结构体系,具有十分复杂的空间效应,而局部屈曲问题是钢箱梁设计中的一个关键问题。因此,对双箱梁节段的局部屈曲分析是非常有必要的。运用大型结构分析软件SAP2000的三维板壳单元进行建模,模型边界的荷载施加考虑了结构总体分析的真实受力工况,分析得到了一些双箱梁节段的三维屈曲模态及屈曲系数,并且提出了一些对结构设计有价值的建议。

Three-dimensional Space Bending of Double-Box Girder Subsection of Main Cable-stayed Bridge for Changjiang River Bridge Shanghai

The deck structure of the cable-stayed bridge being the main shipping span of Changjiang River Bridge Shanghai is the separated double-box girder steel structure system connected by the box linking girders in the middle with the very complex space effect. But the partial bending problem is a key in the design of the steel box girder. Therefore,it is very necessary to analyze the partial bending of the double-box girder subsection. The large-sized structure analysis software SAP2000 of the three-dimensional slab shell unit is applied for building the model. The load application at the boundary of the model is considered of the true bearing situation of the overall analysis of the structure. The article analyzes and gives the three-dimensional bending modal and bending coefficients of some double-box girder subsections,and puts forward some valued suggestions for the structural design.