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Analysis of the dynamic response of a long span bridge using GPS/accelerometer/anemometer under typhoon loading

机译:GPS /加速度计/风速计在台风荷载作用下大跨度桥梁动力响应分析

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摘要

Large flexible engineering structures, such as long span bridges or tall buildings, are susceptible to quasistatic and dynamic deformations caused by different loadings, thus accurate displacement measurements are desirable to assess the integrity and reliability of the structure. In this study, an integrated system that includes Global Positioning System (GPS), accelerometer and anemometer was developed to obtain the responses of a long span bridge to the extreme wind loadings. Spectral analysis based on the Fast Fourier Transform (FFT) algorithm was first carried out to detect the dominant frequencies of the middle pylon. Then the noisy GPS displacement measurements and accelerometer data are de-noised using the Vondrak filter, and the low frequency disturbance was separated from GPS displacement time series. A least-squares based displacement reconstruction scheme using noise-mitigated accelerations was employed, and the Tikhonov regularization scheme with optimal selected regularization factor was used to alleviate the ill-posedness. At last, an adaptive recursive least squares (RLS) filter was adopted to separate the slow-varying movements, and the total displacement with enhanced measurement accuracy was obtained from the combined quasi-static and high-frequency dynamic displacements. A field monitoring data set collected on the Erqi Yangtze River Bridge, a three-tower cable-stayed bridge located in Wuhan, China, was used to validate the effectiveness of the proposed integration processing scheme. The GPS/accelerometer/anemometer installed on the center supporting tower was used to characterize the interaction between the responses and the ambient wind loadings. The results demonstrate the proposed technique can significantly improve the measurement accuracy of pylon displacement under strong winds. The deformation accuracy with the amplitude of several millimeters can be successfully detected,and the spectrum of the pylon response obtained from both GPS data and accelerometer data reveals the identified first dominant frequency of the middle pylon is 0.172 Hz.
机译:大型柔性工程结构(例如大跨度桥梁或高层建筑)容易受到由不同载荷引起的准静态和动态变形的影响,因此需要精确的位移测量以评估结构的完整性和可靠性。在这项研究中,开发了一个包括全球定位系统(GPS),加速度计和风速计的集成系统,以获得大跨度桥梁对极端风荷载的响应。首先进行基于快速傅立叶变换(FFT)算法的频谱分析,以检测中塔的主频。然后,使用Vondrak滤波器对嘈杂的GPS位移测量值和加速度计数据进行去噪,并从GPS位移时间序列中分离出低频干扰。采用了基于最小二乘的减噪加速度位移重建方案,并使用具有最佳选择正则化因子的Tikhonov正则化方案来缓解不适感。最后,采用自适应递归最小二乘(RLS)滤波器分离出缓慢变化的运动,并从准静态和高频动态位移的组合中获得了具有提高的测量精度的总位移。使用在中国武汉的三塔斜拉桥二七长江大桥上收集的现场监测数据集来验证所提出的集成处理方案的有效性。安装在中央支撑塔架上的GPS /加速度计/风速计用于表征响应与环境风荷载之间的相互作用。结果表明,该技术可以显着提高大风条件下塔架位移的测量精度。可以成功地检测到振幅为几毫米的变形精度,并且从GPS数据和加速度计数据获得的塔架响应频谱表明,确定出的中间塔架的第一主频为0.172 Hz。

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