中文摘要：

悬索桥施工期猫道对主缆存在气动干扰效应，从而可能对主缆的驰振性能产生一定影响。文章选取某大跨悬索桥施工期主缆尖顶型和平顶型两种施工方案中共五种工况进行研究。首先，采用3D打印技术制作主缆模型，利用风洞试验方法分别得到不考虑猫道气动干扰影响及考虑猫道气动干扰影响下五种工况的气动力系数，并进行对比分析；然后根据登哈托判据对主缆在-3°～3°风攻角范围内的驰振性能进行分析和对比。结果表明：猫道的气动干扰效应使主缆的阻力系数有所减小，升力系数也发生了明显改变；猫道对0°风攻角时主缆1#和4#驰振性能影响较大，在分析施工期主缆的驰振现象时，猫道的气动干扰效应不能忽略。

英文摘要：

Catwalks have aerodynamic influences on main cables of a suspension bridge during its construction, which may affect the galloping performance of main cables. To study this issue, five typical steepled and flat-toped main cables of a long-span suspension bridge during its construction are selected. Firstly, aerodynamic coefficients of the main cable model manufactured by the 3D printing technology are obtained based on the wind tunnel test, with and without the aerodynamic influence of catwalk considered, respectively, and then, the comparison and analysis are conducted. Furthermore, the Den Hartog criterion is used to analyze the galloping of the main cables at the wind attack angles ranging from -3~ to 3 o based on the aerodynamic coefficients. Results indicate that the drag coefficients of the main cables are reduced to some extent due to the aerodynamic influence of catwalk, and the lift coefficients are changed obviously; the catwalk has significant impact on the main cables and hence its aerodynamic influence shall not be ignored when studying the galloping of the main cables during the construction of suspension bridge.