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桥梁风工程研究的若干新进展 被引量:9

SOME RECENT PROGRESSES IN BRIDGE WIND ENGINEERING RESEARCH
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摘要 介绍我们近年来结合桥梁抗风实际需要的4项研究成果。(1)桥梁节段模型强迫振动风洞实验方法与相应的颤振导数时域识别法与频域识别法,用同一批实验数据作了两种方法的对比研究。频域法自身包含有滤波过程,因而抗干扰能力强,识别的颤振导数曲线平顺光滑;时域法的定解方程对信号相位差较敏感,易受杂波干扰导致结果漂移或波动。(2)以佛山平胜大桥为工程背景,研究了上下行车道主梁相互独立并行带来的双幅桥面的气动干扰及串列双主缆的气动干扰问题。(3)拉索风雨振现场观测与振动控制研究。在岳阳洞庭湖大桥建立了风雨振观测系统,并连续四年进行了长时间现场观测,在风速、风向、雨量等参数对风雨振的影响规律与拉索风雨振振动形态方面有新的发现。开发了一套磁流变式拉索减振新技术,并已于2002年在岳阳洞庭湖大桥全桥实施,三年来显示了良好的减振效果。(4)针对城市桥梁磁流变减振系统的低压供电线路最易受到人为的破坏的问题,设计开发了一种永磁调节装配式磁流变阻尼器(PMAA-MR),并将其成功应用于长沙洪山大桥的拉索减振。 Some recent progresses are reported according to the actual need of bridge design against wind loading. (1) A forced vibration testing method of sectional models in wind tunnel and its time-domain analysis and frequency-domain analysis for identifying the flutter derivatives associated with the experimental method were developed. A comparative study between the two analyzing methods was conducted on the same experimental data. Frequency-domain method had a large capacity against noises, resulting in smooth curves of flutter derivatives with a filtration process included; the formulation of time-domain method was relatively sensitive to signal phase difference and it was apt to be disturbed by noises such that the results might shift or fluctuate. (2) The aerodynamic interference between two separate girders and between two parallel main cables of double deck bridges were studied, taking Fushan Pingsheng bridge as an example. (3) On-site observation of wind-rain induced vibration of stay cables and its control with MR dampers were conducted. A monitoring system for wind-rain induced vibration was built on the Dongting Lake Bridge and has been in service for four years. Some new discoveries were obtained in the influence of wind speed, wind direction and rainfall on wind-rain induced vibration and in the vibration shape of stay cables. A new technique of mitigating cable vibration usingmagneto-rheological (MR) dampers was exploited and applied on the Dongting Lake Bridge in 2002. The observations of the past three years show that the effectiveness of the vibration is well. (4) To avoid the purposive destruction of the power supply system to MR dampers, a permanent magnet-adjusting and assembled magneto-rheological (PMAA-MR) damper was developed and successfully fitted on the Hongshan Bridge in Changsha.
出处 《工程力学》 EI CSCD 北大核心 2006年第S2期93-111,共19页 Engineering Mechanics
基金 国家自然科学基金资助项目(59778043 50478051)
关键词 大跨度桥梁 风致振动 颤振导数 气动干扰 拉索风雨振 磁流变阻尼器 振动控制 long-span bridge wind-induced vibration flutter derivatives aerodynamic interference wind-rain induced vibration magneto-rheological (MR) dampers vibration control
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