| 요약2 |
In this research a dynamic testis performed to evaluate vibration characteristics of the main building of Bongjeong-sa (temple) in the laboratory. For this purpose, a one-third scale model with the roof-dead load of 46,710N is designed and prepared on a steel sliding table of 5m by 4m. From the result of the vibration test, we evaluate natural frequency, transfer function between base layer and damping ratio of the building. The dimensions of this test building are 2910mm wide and 4450mm long. Although the soil walls, windows and doors exist between the columns, to exclude the effect of other variables other than the joints of columns and connecting beams, they were not contained in this test model. Also, the top part of roof was not contained in this test model and replaced by weight. In process of the random vibration experiment, we observe that the natural frequency of test building changes according to the magnitude of vibration. To confirm the variation of natural frequency, the random vibration test was performed for the RMS amplitude of different kinds. To confirm exactly the shift effect of predominant frequencies and the variation of transfer function value, sine waves that the amplitude changes from 0.2mm to 2.5mm were actuated and transfer function was calculated. A free vibration experiment is performed to determine damping ratio and verify the variation of damping ratio by the magnitude of initial impact displacement. |