联合GNSS和加速度计的桥梁结构动态监测试验

发布时间：2018-01-25 20:39

本文关键词： 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　出处：《中国公路学报》2014年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to solve the problem of incomplete and inaccurate modal frequency monitoring in bridge structure vibration monitoring. The GNSS receiver and accelerometer were used in the monitoring test of the Wilford suspension bridge in Nottingham, England, and the monitoring point device was used. The precision time collector solves the problem of multi-sensor coaxial and time synchronization of monitoring points, and synchronously collects GNSS real-time dynamic differential data, network RTKs, post-processing mode data and accelerometer data. The Chebyshev adaptive filtering method is designed to identify the dynamic displacement of bridge structure. The analysis results show that the low value modal frequency is easy to be identified by the component GNSS and the high value modal frequency is easily identified by the accelerometer. The two kinds of sensors can identify the mode frequency of overlapping frequency band, and the results are consistent. The dynamic displacement of the two sensors is consistent, the standard deviation and the average deviation of the difference are less than 1 mm. The joint monitoring method is not only suitable for long span bridge monitoring with low frequency and large amplitude vibration, but also suitable for medium and small span bridge monitoring with high frequency and small amplitude vibration.
【作者单位】：湖南大学土木工程学院;诺丁汉大学地理空间研究所;
【基金】：国家自然科学基金项目(50908083)
【分类号】：U446
【正文快照】： 0引言对桥梁结构进行实时监测、损伤评估和安全预警已成为桥梁建设重要环节。桥梁在长期使用过程中,由于环境侵蚀、材料老化、交通流量加重、超重车辆增多,导致桥梁结构损伤和功能退化,抵抗自然灾害能力下降,易导致灾难事故,造成重大人员伤亡和财产损失。为保障桥梁结构在营运

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