斜拉桥主梁采用前支点挂篮进行悬臂现浇施工时中间张拉索力的优化

Interim Cable Force Optimum of Cable-stayed Bridge with Concrete Girders during the Cantilever Cast-In-Place Construction Using Form Travelers with Fore-fulcra

以石家庄市仓安路斜拉桥施工过程为例,通过分析斜拉桥和挂篮结构在施工过程中内力变化规律,确定合理的中间张拉次数与各次中间张拉索力。要求作为前支点的斜拉索在当前梁段施工过程中应根据主梁和挂篮受力的要求进行多次中间张拉,以便改善结构受力,保证施工安全。

This paper seeks to determine the reasonable frequency of tensioning and the interim cable forces according to the internal forces of the structure and traveler in the course of construction. The structure of the cable-stayed bridge and the travelers with fore-fulcra require that the cable must be tensioned several times during each construction course of girder to improve the structure mechanical state.