Comparative Analysis of Different Cable Force Calculation Methods for Shuangbao Bridge
Shuangbao Bridge is the controlling project of Chongqing-Xiangshan Expressway,which is a double-span top-bearing continuous steel-tube-concrete arch bridge constructed by cable-stayed cable-stayed cable-stayed buckling construction.The arch rib span is large,the number of sections is many,the lifting weight is large,and the line control is difficult.In order to ensure the construction quality and safety,the zero moment method,optimization method and zero displacement method are used to calculate the cable force and line shape during con-struction,and the calculation effect of each calculation method is compared and analyzed.Calculation results show that:the optimization meth-od and zero displacement method can simultaneously meet the requirements of the vertical line and stress of the arch ring,and the zero dis-placement method is more efficient,and its results can be used as a simple method for calculating the cable force of the arch ring.Compared with the other two methods,the zero-moment method calculates a larger number of cables,and the construction line shape is also poorer.
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