采用弹簧悬挂节段模型风洞试验，研究了不同间距比和来流风攻角下双幅Π型叠合梁桥的涡振性能。通过对上、下游断面的涡振振幅、锁定区间、相位差等特性的详细分析，探究了双幅Π型叠合梁的涡振特性。结果表明：在各个攻角（α = ±5°，±3°，0°）和间距比（L/D = 6~8）下，双幅Π型叠合梁下游断面的涡振振幅因气动干扰的作用而被显著放大，而上游受干扰较小，其振幅较之单幅Π型叠合梁略小或接近。上下游断面的涡振风速锁定区间以及涡脱频率几乎不受气动干扰效应的影响，与单幅桥基本一致，然而上下游断面间的涡振存在显著的振动相位差，且其值随着振幅和风速的增大呈近似线性减小趋势。此外，与单幅Π型叠合梁涡振性能最不利发生在负攻角的特性不同，双幅Π型叠合梁的涡振振幅在正攻角下较大，导致其涡振最不利攻角发生在 α = +5°。本文研究结果可为类似双幅桥梁的抗风设计提供有益参考。
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°.
关键词
双幅Π型叠合梁 /
涡激振动 /
气动干扰 /
风洞试验
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Key words
parallel Π-shaped composite girders /
vortex-induced vibration /
aerodynamic interference effects /
wind tunnel testing
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