1.Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University,Changsha 410082, China;
2.Anhui Traffic Survey and Design Institute Co., Ltd., Hefei 230011, China;
3.China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan 430101, China;
4.Department of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
Abstract：In order to study the wind-resistance performance of a multiple parallel continuous steel box girder bridge, The G312 Heliuye highway bridge (with a main span of 180m and four parallel steel box girder) of the Yangtze Huaihe River Diversion Project was cited as the background. Wind tunnel tests were carried out on the sectional model and the full-bridge aeroelastic model for the case of a single bridge and multiple parallel bridges, in which the aerodynamic performance of the single bridge and the influence of aerodynamic interference effects between multiple decks on the vortex-induced vibration and galloping performance of the completed bridge were analyzed,and combined with CFD simulation analysis, the influence mechanism of the number of bridges on the aerodynamic performance of parallel multiple span bridges was explored. The results show that the aerodynamic stability of multiple parallel bridges is affected by many factors, such as the aerodynamic performance of a single bridge, the wind attack angle and the number of parallel decks. For the same wind attack angle, different types of wind-induced vibration, such as vortex-induced vibration, galloping and buffet, may occur to the bridges as the number decks changes. For the wind attack angle of +3°, the twin parallel decks experience large-amplitude vortex-induced vibration, in which the lock-in wind speed range and the maximum vibration amplitude are significantly larger than that of the single bridge; The galloping occurs to the triple parallel decks, and its critical wind speed is greater than that of a single bridge; The four bridges arranged in parallel staggered rows have relatively stable aerodynamic performance, neither vortex-induced vibration nor galloping happen in the wind tunnel test.
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