大跨钢箱斜拉桥塔梁同步施工计算分析

Calculation and Analysis on Synchronised Construction of Both the Tower and Beam of Large-span Steel Box Cable-stayed Bridge

斜拉桥是一种由索、塔、梁三种基本结构形成的高次超静定组合结构。常见的施工方法是先施工主塔再施工钢箱主梁,并张拉斜拉索,而塔梁同步施工方法目前在国内实践的大桥中尚属少见。基于塔梁同步施工方法,采用MIDAS/Civil空间有限元软件和桥梁博士平面有限元软件两种有限元计算软件进行分析比较,通过详细分析主要施工工况下索力、主梁位移与应力、索塔应力与偏移的计算数据,证明了塔梁同步施工方法是可行的。

Cable- stayed bridge is a high -order indeterminate composite structure formed by cable, tower and beam all together three basic structures. Common construction method is to first construct the main tower, then the steel box beam and at the same time stretch the stay cable, however the synehronised construction of both the tower and the beam is very rare in domestic practices at the moment. Based on the synchronised construction method of both the tower and the beam, by analyzing and comparing with MIDAS/Civil space finite element software and Bridge Doctor 2D finite element software and after specific analysis of the major construction cable force, main beam displacement and stress and the calculation proof of the cable and the tower＇s stress and displacement, it is proved that the synchronised construction method of both tower and beam is feasible.