Flutter performance and aerodynamic measures of a suspension bridge with side box steel-concrete composite girder
DONG Jiahui1, ZHOU Qiang1,2, MA Ruwei1, WANG Qi1,2, LIAO Haili1,2
1.Research center for wind engineering, Southwest Jiaotong University, Chengdu, 610031, China；
2.Key Laboratory for Wind Engineering of Sichuan Province, Chengdu, 610031, China
Abstract：In order to investigate flutter performance of a suspension bridge with side box steel-concrete composite girder, taking a certain large-span suspension bridge as background, a series of wind tunnel tests were conducted for a 1∶50 segment model to study the bridge’s flutter form and features, and analyze effects of aerodynamic measures including upper and lower central stabilizing plates, horizontal guide plate, skirt plate and sharpened nozzle on its flutter performance in detail.The results showed that flutter of side box steel-concrete composite girder reveals a torsional dominant and single frequency torsional-bending coupled vibration, i.e., soft flutter phenomenon occurs and vibration frequency is close to the system’s natural torsional frequency.The aerodynamic optimization study showed that for side box steel-concrete composite girder, central stabilizing plate has finite effects on increase in its flutter critical wind speed, while the effect of horizontal guide plate and skirt one’s combined aerodynamic measure is obvious to significantly increase the girder’s flutter critical wind speed; sharpened nozzle can also improve flutter performance of side box steel-concrete composite girder.
董佳慧1,周强1,2,马汝为1,王骑1,2，廖海黎1,2. 边箱钢-混叠合梁颤振性能及气动措施研究[J]. 振动与冲击, 2020, 39(3): 155-160.
DONG Jiahui1, ZHOU Qiang1,2, MA Ruwei1, WANG Qi1,2, LIAO Haili1,2. Flutter performance and aerodynamic measures of a suspension bridge with side box steel-concrete composite girder. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 155-160.
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