Abstract: Based on the analysis of the main cable shape of the suspension bridge and the relationship between the deformation and stress of the main cable, an improved method for calculation of datum strand adjustment of suspension bridge was proposed. Taylor formula was used to expand the alignment equation at the target empty cable state, and the relationship between the cable length adjustment the midsagittal height change of the main cable span can be obtained by solving the expanded equation. At the same time, the calculation accuracy of the methods using first-order and second-order Taylor expansion to fit the main cable shape equation was analyzed, and the application of the proposed method in the case of equal height main tower and unequal height main tower was studied. The results show that the improved method has higher accuracy.

Key words: bridge engineering; main cable shape; cable length; adjusting the cable; Taylor formula

摘要： 基于对悬索桥主缆线形和主缆变形与受力关系的分析，提出了一种悬索桥基准索股调整计算的改进方法。该方法采用泰勒公式将主缆线形方程在目标空缆状态处展开，求解展开后的方程即可获得索长调整量与主缆跨中矢高变化量之间的关系。同时分析了方法采用一阶、二阶泰勒展开式来拟合主缆线形方程的计算精度，研究了该方法在等高主塔、不等高主塔情况下的应用。算例结果表明：改进方法具有较高的精确度。

关键词: 桥梁工程；主缆线形；索长；调索；泰勒公式