1. Research Center for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Wind Engineering Key Laboratory of Sichuan Province, Chengdu 610031, China;
3. Traffic Planning Survey and Design Institute Co., Ltd. of Gansu Province, Lanzhou 730030, China
Abstract：The present study utilized the spring-mounted sectional model testing to investigate the vortex-induced vibration (VIV) characteristics of a parallel Π-shaped composite girders under different spacing ratios and wind attack angles. The VIV amplitude, lock-in wind speed range, phase difference, and spectrum characteristics of the upstream and downstream sections were analyzed in detail to explore the VIV behavior of the parallel Π-shaped composite girders. The experimental results revealed that under various angles of attack (α = ±5°, ±3°, 0°) and spacing ratios (L/D=6~8), the vortex-induced vibration amplitude of the downstream section of the double-Π-shaped composite box girder bridge was significantly amplified due to the aerodynamic interference effects, while the upstream section was less affected, with its amplitude slightly smaller or similar to that of a single-Π-shaped composite box girder bridge. The lock-in range and vortex shedding frequency of the upstream and downstream sections of the bridge were almost unaffected by aerodynamic interference. However, there was a significant phase difference between the upstream and downstream sections of the bridge, and its value decreased linearly with the increasing of amplitude and wind speed. In additional, unlike the VIV performance of a single-Π-shaped composite box girder bridge, which was most severe at negative angles of attack, the VIV amplitude of the double-Π-shaped composite box girder bridge was larger at positive angles of attack, resulting in its most unfavorable angle of attack occurring at +5°.
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