边箱叠合梁涡振性能及抑振措施研究

发布时间：2018-11-01 16:15

【摘要】：为研究边箱叠合梁的涡振抑制措施,优化其涡振性能,以某叠合梁斜拉桥为背景,针对其边箱叠合梁制作主梁节段模型进行风洞试验,研究不同风攻角(0°、±3°、±5)和阻尼比(竖向0.3%、0.6%、0.8%、1.0%,扭转0.5%、1.0%)下主梁的涡振性能,对比有、无人行道栏杆和不同形式封闭人行道栏杆对主梁涡振性能的影响。结果表明:-5°、-3°和0°风攻角下,主梁没有出现涡激振动;+3°和+5°风攻角下,主梁的竖向涡振和扭转涡振最大振幅均远大于规范允许值;主梁的竖向涡振和扭转涡振振幅均随阻尼比的增大而减小,增大阻尼比可以有效抑制主梁的涡振;去掉人行道栏杆后,主梁的竖向涡振消失;对人行道栏杆间隔封闭可以抑制主梁的涡振,相对分散的栏杆封闭方案抑振效果更好,+3°风攻角下较+5°风攻角下抑振效果更优。
[Abstract]:In order to study the vortex vibration suppression measures and optimize the vortex-vibration performance of side-box composite beams, a wind tunnel test was carried out to study the different wind attack angles (0 掳, 卤3 掳) for the main girder segment model of a cable-stayed bridge with a superimposed beam, and the wind tunnel test was carried out for different wind attack angles (0 掳, 卤3 掳). 卤5) and damping ratio (0. 3 / 0. 6 / 0. 8 and 0. 0%, turning 0. 5% and 1. 0% respectively), the vortex-vibration performance of the main beam is compared. The effect of no sidewalk railing and different closed sidewalk railings on the vortex vibration performance of the main beam. The results show that there is no vortex-induced vibration at -5 掳, -3 掳and 0 掳wind attack angle, and the maximum amplitude of vertical vortex vibration and torsional vortex vibration of the main beam at 3 掳and 5 掳wind attack angle is much larger than the allowable value of the code. The amplitude of the vertical vortex vibration and torsional vortex vibration of the main beam decreases with the increase of damping ratio, which can effectively suppress the vortex vibration of the main beam, and the vertical vortex vibration of the main beam disappears after the sidewalk railing is removed. The vortex vibration of the main beam can be restrained by the closure of the sidewalk railings, and the vibration suppression effect of the isolated balustrade closure scheme is better than that of the 5 掳wind attack angle, and the 3 掳wind angle of attack is better than the 5 掳wind attack angle.
【作者单位】：西南交通大学桥梁工程系;西南交通大学风工程试验研究中心;
【基金】：国家自然科学基金项目(51778545)~~
【分类号】：U441.3;U448.27

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