摘要
介绍了在湖南岳阳洞庭湖大桥进行风雨振观测的情况,得到了拉索加速度时程曲线、拉索振动的加速度轨迹和共振频率;通过数值仿真和现场试验全面评估了磁流变阻尼器对拉索振动控制的性能,得出了阻尼器安装位置、外部激励大小及阻尼器输入电压大小等参数对拉索系统各阶模态阻尼比的影响规律及磁流变阻尼器的减振效果。结果显示在安装磁流变阻尼器后拉索系统的前三阶模态阻尼比大大增加,并且存在一个优化电压,在该电压下能取得最大的模态阻尼比,表明磁流变阻尼器具有良好的减振性能。实际风雨振观测进一步验证了其良好的减振效果。
A Wind-rain induced vibration and its control on the stay cables of cable-stayed bridges are studied in the paper. The time-history of acceleration response for the Dongting Lake Bridge is obtained. It is also obtained with the acceleration record and frequencies of the stay cables. A magneto-rheological damper is used for the stay cables. The results are shown that the first three modal damping ratios of the stay cables increasing greatly after attaching the dampers. It is also compared with that of the numerical simulations and field tests. It is found that the maximum modal damping ratio is arrived when an optimal voltage achieved.
出处
《土木工程学报》
EI
CSCD
北大核心
2003年第6期53-59,共7页
China Civil Engineering Journal
基金
国家自然科学基金(编号50178013)
关键词
斜拉索
风雨振
磁流变阻尼器
振动控制
cable-stayed bridge, wind-rain induced vibration, magneto-rheological damper, vibration control
