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http://dx.doi.org/10.5000/EESK.2012.16.3.023

Ambient Vibration Testing and System Identification for Tall Buildings  

Cho, Soon-Ho (광주대학교 건축학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.16, no.3, 2012 , pp. 23-33 More about this Journal
Abstract
Dynamic response measurements from natural excitation were carried out for three 18-story office buildings to determine their inherent properties. The beam-column frame system was adopted as a typical structural form, but a core wall was added to resist the lateral force more effectively, resulting in a mixed configuration. To extract modal parameters such as natural frequencies, mode shapes and damping ratios from a series of vibration records at each floor, the most advanced operational system identification methods based on frequency- and time-domain like FDD, pLSCF and SSI were applied. Extracted frequencies and mode shapes from the different identification methods showed a greater consistency for three buildings, however the three lower frequencies extracted were 1.2 to 1.7 times as stiff as those obtained using the initial FE models. Comparing the extracted fundamental periods with those estimated from the code equations and FE analysis, the FE analysis results showed the most flexible behavior, and the most simple equation that considers the building height as the only parameter correlated fairly well with test results. It is recognized that such a discrepancy arises from the fact that the present tests exclude the stiffness decreasing factors like concrete cracking, while the FE models ignore the stiffness increasing factors, such as the contribution of non-structural elements and the actual material properties used.
Keywords
Dynamic properties; Finite element analysis; Natural vibration; Operational modal analysis; System identification; Tall buildings;
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