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Experimental study of traffic-induced vibration of the new CCTV headquarters building

Journal of Civil Engineering and Architecture 2009年第3期3卷 31-38页

作者： ZHANG Nan XIA He ZHAN Jia-wang YAN Hui-chun XU You-lin School of Civil Engineering Beijing Jiaotong University Beijing 100044 China Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong China

The traffic-induced vibrations of the new CCTV Headquarters building are studied stages. In the first stage when the through experiments in two 30th floor of the northwest tower and the 38th floor of the southeast tower were finished, the traffic flows on the roads surrounding the building were investigated, and 27 setups of accelerations were measured at the roadside, on the pile cap and on the 9th floor. In the second stage when the whole steel structure was completed, l 5 setups of accelerations were measured at the roadside, on the pile cap and on the 37th and the 48th floors. The accelerations of the building under different traffic flows, in different positions are analyzed in both time domain and frequency domain. The damping ratios are estimated by the upgraded half-power bandwidth method.

关键词： dynamic experiment traffic-induced vibration power spectrum half-power bandwidth method

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Damping Identification of Bridges Under Nonstationary Ambient vibration

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Engineering 2017年第6期3卷 839-844页

作者： Sunjoong Kim Ho-Kyung Kim Department of Civil and Environmental Engineering Seoul National University Seoul 08826 Korea

This research focuses on identifying the damping ratio of bridges using nonstationary ambient vibration data. The damping ratios of bridges in service have generally been identified using operational modal analysis （OMA） based on a stationary white noise assumption for input signals. However, most bridges are generally subjected to nonstationary excitations while in service, and this violation of the basic assumption can lead to uncertainties in damping identification. To deal with nonstationarity, an amplitude-modulating function was calculated from measured responses to eliminate global trends caused by nonstationary input. A natural excitation technique （NExT）-eigensystem realization algorithm （ERA） was applied to estimate the damping ratio for a stationarized process. To improve the accuracy of OMA-based damping estimates, a comparative analysis was performed between an extracted stationary process and nonstationary data to assess the effect of eliminating nonstationarity. The mean value and standard deviation of the damping ratio for the first vertical mode decreased after signal stationarization.

关键词： Damping Operational modal analysis traffic-induced vibration Nonstationary Signal stationarization Amplitude-modulating Bridge Cable-stayed Suspension

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