Measurement of the dynamic displacements and of the modal frequencies of a short-span pedestrian bridge using GPS and an accelerometer
Measurement of the dynamic displacements and of the modal frequencies of a short-span pedestrian bridge using GPS and an accelerometer
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DOI：
10.1016/j.engstruct.2010.09.013
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发表时间：
2011-01-01
影响因子：
5.5
通讯作者：
Stiros, Stathis
中科院分区：
文献类型：
--
作者：
Moschas, Fanis;Stiros, Stathis
利用独立加速度计数据约束和检验的信号分析技术(监督式学习滤波与切比雪夫滤波相结合)，对40m长钢质人行桥在人群协调跳跃激励下的振动噪声GPS测量进行了处理。这种方法可以对大地位移记录进行去噪，并重建这座刚架桥动态位移的最小偏置波形(4.3赫兹的模态频率，类似于6 mm的振荡幅度)。这一结果表明，经过适当处理的高频卫星大地测量数据不仅可以用于高层建筑、斜拉桥等柔性结构的动态位移测量，还可以用于刚性土木工程结构的动态位移测量，并可用于大范围工程结构的结构健康监测、分析和设计。研究还发现，虽然目前使用的10赫兹采样率GPS接收器可能低估了某些高频峰值位移，但对于最近引入的50-100赫兹接收器来说，这不是问题。(C)2010爱思唯尔有限公司。保留所有权利。
Signal analysis techniques (supervised-type learning filter in combination with a Chebyshev filter) constrained and tested by independent accelerometer data were used to process noisy GPS measurements of oscillations of 40 m long steel footbridge excited by coordinated jumps of a group of people. This approach permitted to de-noise the geodetic displacement record and reconstruct a minimum bias waveform for the dynamic displacement of this stiff bridge (4.3 Hz modal frequency, similar to 6 mm oscillation amplitude). This result indicates that properly processed high-frequency satellite geodetic data may be used to measure dynamic displacements not only of high-rise buildings, cable-stayed bridges and other flexible structures, but of stiff civil engineering structures as well and may be useful for the Structural Health Monitoring, analysis and design of a large range of engineering structures. It was also found that although currently used 10 Hz sampling rate GPS receivers may underestimate certain high-frequency peak displacements, this will not be a problem for the recently introduced 50-100 Hz receivers. (C) 2010 Elsevier Ltd. All rights reserved.