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Title |
Seismic Response Characteristics of Domestic Cable-supported Bridges Due to Gyeongju Earthquakes: Case Study
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Authors |
박성우(Sung Woo Park) ; 이승한(Seung Han Lee) ; 최가희(Gahee Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.5.001 |
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Keywords |
경주지진 ; 케이블교량 ; 지진 응답 특성 ; 지진가속도계측기 Gyeongju earthquake ; Cable-supported bridges ; Seismic response characteristic ; Seismic acceleration sensors |
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Abstract |
This study presents the seismic response characteristics of domestic cable-supported bridges due to 3 earthquakes with magnitudes of 5.1, 5.8, and 4.5 in Richter scale, which occurred around Gyeongju region in 2016. The seismic acceleration response signals, recorded by the seismic acceleration sensors at the free field near bridge and designated positions on bridge, are utilized to characterize the seismic responses of structural elements of cable-supported bridges. The dynamic behaviors of bridges are presented through Fourier transform of acceleration time history. Using the peak accelerations normalized by those at the free fields, amplification effects on the tops of the pylons are analyzed comparatively bridge by bridge. Using aforementioned analyses, the necessity of development on the creteria of alert levels is discussed for the earthquake disaster response of cable-supported bridges.
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