摘要
边主梁断面(或Π形梁)是大跨度斜拉桥中常用的一种主梁断面形式,但容易产生涡激共振现象。涡激共振的典型特点之一是具有阻尼敏感性。文中针对在建的贵州望漠北盘江大桥的风致涡激振动进行了阻尼敏感性风洞试验研究。试验结果表明,该类桥梁涡激共振幅值对阻尼的设置十分敏感。因此,对于低风速下容易出现的涡激共振来说,采用多大的阻尼进行抗风设计十分关键。
The side-girder section （or II shape girder） is one of the most common section used in the main girder of the long-span cable-stayed bridges. However, it is susceptible to vortex-induced resonance. One of the characteristics of vortex-induced resonance is the sensitivity to structural damping. By wind tunnel tests, this paper investigated the damping sensitivity of the vortex-induced vibrations of the Beipan river bridge in Wangmo, Guizhou province, which is under construction. The experi- mental results show that the amplitudes of vortex-induced oscillations are very sensitive to the structural damping. Therefore, how to set the damping ratio is critical to the wind resistance design regarding the vortex-induced resonances, which liable to arise at low wind speeds.
出处
《交通科技》
2013年第5期31-34,共4页
Transportation Science & Technology
关键词
边主梁
斜拉桥
涡激共振
阻尼
风洞试验
side-girder
cable-stayed bridge
vortex-induced resonance
damping
wind tunnel test
