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박종칠(Park Jong Chil),길흥배(Gil Heung Bae),강상규(Kang Sang Gyu),임채운(Lim Chae Woon) 대한토목학회 2010 대한토목학회논문집 A Vol.30 No.4A
본 논문은 GNSS 데이터를 이용한 사장교의 고유진동수와 모드형상 추출을 다루고 있다. 서해대교 사장교에 설치된 6개의 GNSS 측정점으로부터 응답신호를 얻어 동특성 분석에 사용하였다. 측정된 GNSS 신호에 대해 정규화 과정과 버터워스 필터를 사용하여 관심영역의 신호를 분리한 뒤, 이중 미분을 수행하여 가속도 데이터로 변환하였다. 변환된 가속도에 대한 FFT 분석을 통해 5개의 고유진동수를 추출하였으며, 이를 기존 연구결과와 비교 검증하였다. 또한 TDD기법을 이용하여 GNSS 데이터로부터 교량의 모드형상까지 추출할 수 있었다. This paper presents the extraction of natural frequencies and mode shapes of a cable-stayed bridge using data acquired from GNSS. The response signals of 6 GNSS measuring points installed at the Seohae cable-stayed bridge are used for analysis of dynamic characteristics. Using normalization process and a third order Butterworth filter for the measured signals, the related pass band's signals have been isolated. Then, the acceleration data by double differentiation for these signals are obtained. Total five natural frequencies have been extracted by the fast Fourier transform and compared to the results of different studies. For the acceleration obtained from GNSS signals, the mode shapes of the bridge have been successfully extracted by TDD technique.
박래선(Park Rhae-Sun),이상순(Lee Sang-Soon),임채운(Lim Chae-Woon) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Fire may lead to web shear buckling in steel box girders due to degradation of the steel strength at elevated temperatures. In this paper, shear buckling strength and ultimate shear strength are evaluated at elevated temperature and stability analysis for fire-damaged web plate is performed.
박래선 ( Park¸ Rhae-sun ),이상순 ( Lee¸ Sang-soon ),임채운 ( Lim¸ Chae-woon ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
Fire may lead to web shear buckling in steel box girders due to degradation of the steel strength at elevated temperatures. In this paper, shear buckling strength and ultimate shear strength are evaluated at elevated temperature and stability analysis for fire-damaged web plate is performed.
박병철(Park Byung Chul),김동인(Kim Dong In),이상순(Lee Sang Soon),우정원(Woo Jeong Weon),임채운(Lim Chae Woon) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
The fatigue problems of PSCI bridges are more serious than other types of concrete bridges, because the cross sectional area and self weight of PSCI bridges are smaller than those of other bridge types. If a crack is produced by flexural moment, stress acting on PS wire increase for concrete can"t resist tensile stress. In this report, fatigue safety estimation of PSCI Bridge for live load is performed and methods of reinforcement is introduced.