斜拉桥施工阶段初张索力计算方法研究

提出了用差值法确定一次张拉斜拉桥施工阶段拉索初张力的实用计算方法,该方法只需按施工步骤进行正装迭代计算。通过消除成桥阶段最优目标索力与正装迭代所得成桥索力之间的差值,可获得施工阶段拉索初张力。该方法避免了传统倒拆法无法考虑混凝土收缩、徐变和几何非线性等问题,同时给出了差值法加速收敛的近似方法,并对差值法和影响矩阵法进行了比较。通过一座实际桥梁的计算分析,证明了本方法的可行性,具有一定的应用价值。

Method to Determine Construction Cable Tension Force of Cable-Stayed Bridge

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.