The suspenders on the sides of an arch bridge are highly vulnerable to damage caused by traffic load and environmental corrosion. To accurately estimate the cable force of suspenders, herein, we analyse the influencing factors through a suspender tension test based on the principle of suspender vibration. The frequency of each suspender of the bridge is evaluated using the frequency method. By combining the cable force data measured directly and the measured suspender frequency, the formulas for calculating the cable forces of long and short suspenders are fitted, and a reasonable estimation method for the calculated length of short suspenders is provided. The formulas are verified through application to a CFST arch bridge. Results indicate that the proposed formula effectively considers the influence of the sleeve on the overall calculated length of the suspender. The formula calculates the suspender cable force with higher accuracy, proving its suitability for engineering use.

中文翻译：

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大跨度钢管混凝土拱桥吊索更换方法及基于频率法的索力测量

拱桥两侧的吊杆极易受到交通荷载和环境腐蚀造成的损坏。为准确估算吊杆索力，本文基于吊杆振动原理，通过吊杆拉力试验分析其影响因素。使用频率方法评估桥梁每个吊杆的频率。结合直接测得的索力数据和实测吊杆频率，拟合出长短吊杆索力计算公式，为计算短吊杆长度提供了合理的估算方法。这些公式通过应用于 CFST 拱桥进行验证。结果表明，所提出的公式有效地考虑了袖子对吊带整体计算长度的影响。该公式计算出的吊索力具有更高的精度，证明其适用于工程应用。