宽幅牵索挂篮中间索力确定的简化方法

A Simplified Method for Determining the Interim Cable Force of the Broad Cable-supported Form Traveler

根据宽幅牵索式挂篮和混凝土主梁的受力情况,提出一种简化方法,快速确定牵索挂篮施工过程的中间索力。即先分析牵索挂篮在张拉阶段和浇筑阶段的受力特点;以张拉阶段的挂篮中吊点反力和应力为限值条件,初步确定一、二张索力;将拟定的中间索力代入正装计算,得出浇筑阶段的索力值和主梁施工过程的应力值;验算牵索挂篮在浇筑阶段的受力情况和主梁的应力状况,并结合实际工程项目,以一座在建斜拉桥（均安水道特大桥）为算例,用上述的简化方法确定中间索力;所求出的中间索力可以满足挂篮和主梁的受力要求,表明了该方法的简单、合理。

According to the broad cable-supported form traveler and concrete girder type hanging basket, a simplified method is presented to quickly determine the cable between the hanging basket construction process of cable force. The first analysis of Guyed in tension and stress characteristics of the pouring stage; the hanging basket lifting force and stress conditions the limit value of one or two preliminary identification of tension force in the tension stage; put forward calculation of cable force will draw the middle, the pouring stage cable force value and girder construction process stress value; checking guyed in stress state of stress and the pouring stage. Combined with the actual project. In a building （Jun＇an Shuidao Bridge） cable-stayed bridge as an example, using the above simplified Methods the intermediate cable force is determined, and the intermediate cable force can meet the requirements of the hanging basket and the main beam, which shows the simplicity and rationality of the method.