大跨度斜拉桥分离式双箱梁桥面节段的三维空间屈曲

局部屈曲问题是钢结构设计中的一个关键问题。上海长江大桥主通航孔桥的桥面结构为中间箱形连系梁连接的分离式双箱梁体系,具有十分复杂的空间效应;所以,对桥面结构节段的局部屈曲分析是非常有必要的。运用三维板壳单元进行建模,模型考虑了桥面风嘴部分对节段局部屈曲的影响,并且提出了一些对桥面结构设计有价值的建议。

Three-Dimensional Spacial Buckling of Separated Twin-box Deck Segment in Large-span Cable-Stayed Bridge

Local bucking is a key issue in the design of steel structure. In the deck design of main navigation span bridge in Shanghai Yangtze River Bridge, the deck was designed as separated twin-box girder connected by the box section beam. The steel deck system presents complicated three-dimensional mechanical behavior and should be paid more attention to the three dimensional buckling effect of the deck system. 3D plate element was adopted for the analytical models which considers the effect of tuyere part on the buckling of whole deck segment, some useful suggestion for the design based on the analysis results were given.