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本文分析了天津永和大桥斜拉索换索方法,并采用MIDAS软件建立了计算模型,对换索后斜拉索索力、主梁线形与弯曲应力的变化与实测情况进行了对比。该桥换索计算结果表明:卸索后的索力基本由同侧、同号剩余索和临近2～3组斜拉索所分担;主梁线性与弯曲应力变化不大。本文的分析结果可作为同类斜拉桥换索的参考依据。
In this paper, the method of cable-stayed cable replacement in Tianjin Yonghe Bridge was analyzed and the calculation model was established by using MIDAS software. The changes of cable force, linear deformation of girder and bending stress were compared with the measured data. The calculation results of the cable changeover of the bridge show that the cable force after unloading is basically shared by the same side, the same number of remaining cables and the adjacent 2 or 3 groups of stay cables; and the linearity and bending stress of the main beam have little change. The analysis results of this paper can be used as a reference basis for cable stayed cable replacement.