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http://dx.doi.org/10.5000/EESK.2010.14.2.067

Estimation of Modal Parameters for Plastic Film-Covered Greenhouse Arches  

Cho, Soon-Ho (광주대학교 건축학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.14, no.2, 2010 , pp. 67-74 More about this Journal
Abstract
To a series of vibration records obtained from experimental modal testing using a fixed hammer and roving accelerometers for greenhouse arch structures, modal parameters such as natural frequencies, damping ratios and mode shapes are extracted by applying the two most advanced system identification methods in the frequency-domain up to now, so-called PolyMAX and FDD. The former involves both input and output data, while the latter utilizes only the output data. The possibility of determining the static buckling load, detecting damages, etc., for very slender steel-pipe arches by means of a non-destructive testing method based on vibration measurements is primarily investigated. The extracted modal parameters generally correlated well with those obtained using finite element analysis, demonstrating promising results for further on-going research.
Keywords
Arches; Experimental modal analysis; Finite element analysis; Frequency-domain; Plastic film-covered greenhouses; Modal parameters; Non-destructive testing; Operational modal analysis; Steel pipe; System identification;
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