Basedontheanalysisofgallopingandaerostaticcoefficientsofthelargescalespiretypemaincableofa suspension bridge considering the effect of catwalk during construction,a numerical simulation method of CFD was proposed .The design parameters of the catwalk and main cable of Xihoumen Suspension Bridge were adopted in calculation. Referring to the results of wind tunnel tests for catwalk,the validity of the parameters set in the numerical simulation was verified.The drag and lift coefficients of main cables with triangular and pentagonal shapes during construction were calculated,considering the aerodynamic interference effect of catwalk.Then,the galloping coefficients of the main cable during construction under different working conditions were calculated by virtue of the Den-Hartog criterion.The results show that the setting of the numerical calculation parameters is correct;the drag coefficients of the main cable with a shape of triangle in lower section and pentagon in middle section under different working conditions do not change obviously with the increase of the number of cable strands considering the aerodynamic interference effect of catwalk,while the downward trend of lift coefficients is more and more obvious;with the increase of the number of strands in the same layer,the galloping coefficients under different working conditions decline gradually;the galloping is more likely to happen under the symmetric shape working condition than the unsymmetrical shape working condition.%针对大跨径悬索桥主缆施工进度对施工期大尺寸尖顶型主缆静风系数及驰振性能影响问题，用CFD数值模拟方法，参考西堠门大桥施工期猫道及主缆设计参数。结合猫道风洞试验结果验证数值模拟参数设置的正确性；计算考虑猫道影响时施工期三角形形状、五边形形状主缆在不同施工进度下的阻力及升力系数；利用登哈托准则计算施工期主缆不同施工进度的驰振力系数。结果表明，数值计算参数设置方法正确；考虑猫道影响，随主缆单层索股数量增加施工期下部呈三角形形状、中部呈五边形形状主缆工况的阻力系数变化不大，升力系数随攻角变化下降趋势明显；随单层索股数量增加驰振力系数总体呈下降趋势；对称型较不对称型工况发生驰振的可能性更大。
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