关键词: 斜拉桥, 差值法, 索力调整, 正装分析, 施工索力

Abstract: A practical method named as differential method to determine construction cable tension force of cable-stayed bridge was proposed. It only applies to the forward-calculation according to the construction steps. By eliminating the gap between the aimed optimum cable tension force and the cable tension force which have been calculated through the construction steps, the construction cable tension force will be got. The disadvantages often appearing in the traditional back-analysis method such as concrete shrinkage, creep and geometric non-linearity can be avoided easily. Meanwhile,an approximate law to accelerate convergence was given, and a comparison between differential method and influence matrix method was made. This method has been applied in an actual bridge structural analysis. The results show that it is feasible and effective.

Key words: cable-stayed bridge, differential method, cable tension force adjustment, forward analysis, construction cable tension force