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联合GNSS和加速度计的桥梁结构动态监测试验

, PP. 62-69

Keywords: 桥梁工程,结构健康监测,全球导航卫星系统,模态频率,加速度计

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Abstract:

?为了解决桥梁结构振动监测中模态频率监测不完整和不准确的问题,采用全球导航卫星系统(GNSS)接收机和加速度计在英国诺丁汉威尔福德悬索桥进行监测试验,使用监测点装置、精密时间采集器解决监测点多传感器同轴、时间同步问题,同步采集GNSS实时动态差分(RTK)、网络RTK、后处理模式数据和加速度计数据,设计切比雪夫-自适应滤波方法识别桥梁结构动态位移。分析结果表明:GNSS易识别低值模态频率,加速度计易识别高值模态频率,2种传感器均可识别出重叠频带的模态频率,且结果吻合;2种传感器识别的动态位移吻合,两者差值的标准差和平均偏差均小于1mm;联合监测方法既适用于低频率、大振幅振动的大跨径桥梁监测,也适于高频率、小振幅振动的中小跨径桥梁监测。

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