변위 비교를 통한 케이블지지교량의 긴급 지진 안전성 평가 방법의 고찰
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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초록
이 연구에서는 사장교 및 현수교에 부착된 지진가속도계측기를 활용하여 교량의 안전성을 긴급하게 평가할 수 있는 기법을 제안한다. 실측된 지진가속도계측기의 상시 응답을 이용하여 구조해석 모델의 고유주파수와 비교를 통해 최대한 유사한 동적특성을 갖도록 모델링을 개선한다. 설계지진에 대한 지진해석을 수행하여 지진가속도계측기 설치 위치별 최대 변위를 도출하며, 도출된 변위는 사전에 관리기준치로서 시스템에 기 입력된다. 지진발생 시 실시간으로 측정된 가속도 시간이력을 필터링 후 2중적분을 통해 변위시간이력으로 변환한 뒤 최대변위를 추출한다. 최종적으로 시스템에 기 입력된 관리기준치와 추출된 변위와의 비교를 통해 안전성을 평가한다. 경주지진 시 기록된 데이터를 활용한 12개 특수교량의 긴급 안전성평가 수행을 통해 제안된 방법의 적용성을 확인한다.
Abstract
This study presents the emergency assessment method about seismic safety of cable-supported bridges using seismic acceleration sensorsinstalled on the primary structural elements of them. The structural models of bridges are updated iteratively to make their dynamic characteristicsto be similar to those of real bridges based on the comparison of their natural frequencies with those of real bridges estimated from acceleration datameasured at ordinary times by the seismic acceleration sensor. The displacement at the location of each seismic acceleration sensor is derived by seismicanalysis using design earthquake, and the peak value of them is determined as the disaster management criteria in advance. The displacement timehistory is calculated by the double integration of the acceleration time history which is recorded at each seismic acceleration sensor and filtered by highcut(low pass) and low cut(high pass) filters. Finally, the seismic safety is evaluated by the comparison of the peak value in calculated displacement timehistory with the disaster management criteria determined in advance. The applicability of proposed methodology is verified by performing the seismicsafety assessment of 12 cable-supported bridges using the acceleration data recorded during Gyeongju earthquake.
참고문헌 (11)
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