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| 상시미동측정에 의한 법주사 팔상전의 동적특성 분석 |
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김혜원, 이정한, 이원호 |
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| Dynamic Characterization of Palsangjeon in Beobju Temple using Ambient Vibration |
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| Abstract |
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According to the result of recent foreign study for seismic performance of 5-story wooden pagoda, it is revealed that damage controlled structure is constituted by central pillar and pagoda body with their respective different dynamic characteristics of reducing resonance of the wooden pagoda during occurrence of earthquake. In conjunction with this discovery, an engineering study is required even for examining structural stability and preservation of the 5-story wooden pagoda of Palsangjeon in Beobju Temple. Accordingly, in order to define seismic performance of Palsangjeon in Beobju Temple, ambient vibration testing was performed as a part of this study. Palsangjeon, which is the subject to be measured, was built in 1624, and was dismantled for repair in 1968. As far as its architectural dimension is concerned, it is constituted with the 1
ststory of 5 units×5 units (11.35 m×11.35 m), the 3 rdstory of 3 units× 3 units, and the 5
thstory of 1 unit×1 unit, and the pagoda body height of Palsangjeon is 17.515 m, and the upper pagoda is 4.085 m,and total height is 21.6 m. Internal central pillar is connected from the 1 stto the 5thstory, and it is surrounded by 4 outside pillars and walls. According to the result of ambient vibration testing, it was confirmed that the natural frequency of Palsangjeon is 1.22 Hz for X and Y direction, and the parallel mode is displayed at 2.76 Hz and 3.96 Hz simultaneously, and a reverse-phase mode is indicated at 1.49 Hz. Damping factor with human excitation was 1.9% for X direction and 1.7% for Y direction respectively. Comparing with the existing measurement result tested in 1997, the primary and secondary natural frequency were similar and there is no change of structural rigidity, and comparing with wooden pagodas of Japan, the height of Palsangjeon is smaller, however, its natural frequency,damping factor, and so forth had similar trend with those of the Japanese wooden pagodas. Comparing with the domestic traditional wooden structures such as private house, temple, castle gate, et cetera, it was confirmed that natural frequency was smaller, however,damping factor was similar with the value of around 2%. |
| Key Words:
Wooden pagoda; Ambient vibration; Natural frequency; Damping factor |
| 핵심용어:
목조탑; 상시미동; 고유진동수; 감쇠정수 |
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