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Title |
Study on the Emergency Assessment about Seismic Safety of Cable-supported Bridges using the Comparison of Displacement due to Earthquake with Disaster Management Criteria
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Authors |
박성우(Sung-Woo Park) ; 이승한(Seung Han Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.114 |
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Keywords |
지진 안전성 평가 ; 지진가속도계측기 ; 케이블지지교량 ; 재난관리 기준 seismic safety assessment ; seismic acceleration sensor ; cable-supported bridge ; disaster management criteria |
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Abstract |
This study presents the emergency assessment method about seismic safety of cable-supported bridges using seismic acceleration sensors installed on the primary structural elements of them. The structural models of bridges are updated iteratively to make their dynamic characteristics to be similar to those of real bridges based on the comparison of their natural frequencies with those of real bridges estimated from acceleration data measured at ordinary times by the seismic acceleration sensor. The displacement at the location of each seismic acceleration sensor is derived by seismic analysis using design earthquake, and the peak value of them is determined as the disaster management criteria in advance. The displacement time history is calculated by the double integration of the acceleration time history which is recorded at each seismic acceleration sensor and filtered by high cut(low pass) and low cut(high pass) filters. Finally, the seismic safety is evaluated by the comparison of the peak value in calculated displacement time history with the disaster management criteria determined in advance. The applicability of proposed methodology is verified by performing the seismic safety assessment of 12 cable-supported bridges using the acceleration data recorded during Gyeongju earthquake.
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