关键词: 变曲率, 顶推, 钢箱梁, 局部分析, 滑道, 橡胶垫块

Abstract: The non-stress aligument of present long-span steel box girder bridges is generally a single radius of vertical curve. The non-stress alignment of steel box girder of Hangzhou Jianglong Bridge is a continous variablely curved vertical curve. The feature of variable curvature not only changes the incremental launching radius of vertical curve, but also makes the displacament of steel box girder at slide path corner obvious. Therefor,the new requirement to construct the incremen- tal launching slide path is put forward:the alignment of rubber surface should automatically adapt to the changes of grider. The security of steel box girder forcing is essentialto the success of the incremental launching. 3D finite element analysis on local steel box girder of the slide path is carried out by ANSYS, and stress distributions of various components of steel box girder under seven typical operation conditions are comparied. The analysis draws a conclusion that the counterforce of tem- porary pier and ne corner displacement of the steel box girder on the slide are critical factors to affect the local stress of the steel box girder.

Key words: varlable curvaturg, incremental launching, steel box girder, local analysis, slide path, rubber