Aiming at the problem that a traditional single-DOF galloping model may cause mis-judging when analyzing galloping of large scale spire type main cable of a suspension bridge during construction, a new 2-DOF galloping model considering the main cable motion along transverse wind direction and down wind direction was established. Firstly, a long-span suspension bridge in the East China Sea was taken as a study object, aerodynamic coefficients of the main cable in its several typical working cases during construction were calculated using the numerical simulation method based on the software Fluent. Secondly, the finite element model of the bridge including main tower, main cable and catwalk was established, and the dynamic characteristics of the main cable were obtained with the modal analysis. Finally, the working cases of the main cable that may have galloping were selected, and galloping critical wind speeds were calculated based on the single-DOF model and the 2-DOf model, respectively and the results were analyzed contrastively. It was indicated that the galloping critical wind speeds based on the two models are quite different, the traditional single-DOF model may lead to a mis-judging if there is a galloping; the results provide a theoretical reference for analyzing galloping of large scale spire type main cable of a suspension bridge during construction.
李胜利,王超群,宁佐强,王东炜. 悬索桥施工期大尺寸主缆驰振分析方法研究[J]. 振动与冲击, 2017, 36(24): 51-57.
LI Shengli WANG Chaoqun NING Zuoqiang WANG Dongwei. galloping analysis methods for large scale spire type main cable of a suspension bridge during construction. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(24): 51-57.
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