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Application of Image Processing to Determine the Natural Period of Buildings' Vibration
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M. J. Najari   , M. Mahmoudi * , M. A. Mirghasempour |
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Abstract: (6093 Views) |
| Natural period of vibration (or natural frequency) is one of the structural dynamic characteristics. It does not depend on seismic loading and depends only on buildings' specifications. There are some analytical and experimental methods for determination of natural periods. In this paper, the natural periods of a three-story building are studied using free vibration test. This building seismically induced by initial displacement in X and Y directions. The structural responses are measured by strong video camera and two-frequency GPS device mounted on the roof. Image processing was used for determination of natural periods (or natural frequencies). The tests were repeated for two directions. Analytical methods were done for controlling of the experimental results. For example, the natural frequencies in X direction were determined 1.07, 1.09 and 0.93 Hz using GPS, image processing and analytical methods respectively. The natural frequencies for Y direction were also obtained 1.13, 1.19 and 1.08 Hz respectively. Comparing the results of the image processing and GPS measurements indicate good convergence results of the two methods in determination of the dynamic characteristics of structures. The results from analytical method also are the same as the experimental results approximately. The small error is due to simulation of the model in analytical software. |
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| Keywords: Dynamic parameters of structures, Period, Frequency, Mode shape, Damping, GPS, Image Processing |
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Full-Text [PDF 394 kb]
(1931 Downloads)
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Type of Study: Research |
Subject:
Photo&RS
Received: 2014/07/23
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