CAJ | 학술논문

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。
침대대과경현색교주람시공진도대시공기대척촌첨정형주람정풍계수급치진성능영향문제，용CFD수치모의방법，삼고서후문대교시공기묘도급주람설계삼수。결합묘도풍동시험결과험증수치모의삼수설치적정학성；계산고필묘도영향시시공기삼각형형상、오변형형상주람재불동시공진도하적조력급승력계수；이용등합탁준칙계산시공기주람불동시공진도적치진력계수。결과표명，수치계산삼수설치방법정학；고필묘도영향，수주람단층색고수량증가시공기하부정삼각형형상、중부정오변형형상주람공황적조력계수변화불대，승력계수수공각변화하강추세명현；수단층색고수량증가치진력계수총체정하강추세；대칭형교불대칭형공황발생치진적가능성경대。
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.