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Detection of Manufacturing Defects in Stiffness of CFTA Girder using Static Loading
김두기,나뎀 파레즈,취진타오,박경훈,Kim, Doo-Kie,Alfahdawi, Nathem,Cui, Jintao,Park, Kyung-Hoon Computational Structural Engineering Institute of 2012 한국전산구조공학회논문집 Vol.25 No.1
새로운 형태의 교량 거더인 CFTA(Concrete filled and tied tubular steel arch) 거더의 비선형 거동에 대해 고찰한 후, CFTA 거더의 대량 공장 생산시 콘크리트 충진 불량으로 발생할 수 있는 결함인 거더 안의 빈 공간을 탐지하는 새로운 방법을 제안하였다. CFTA 거더 안의 비대칭성 콘크리트 충진 불량 결함을 구조물의 대칭 거동을 이용하여 탐색하였으며, 수치해석과 실험을 통해 제안된 방법을 검증하였다. 제안된 방법을 수치적으로 검증하기 위해 3차원 유한요소모델을 사용하였으며, 실험적으로 검증하기 위해 CFTA거더의 정적 실험자료를 사용하였다. This paper presents a study on the nonlinear behavior of an innovative bridge girder made from concrete-filled and tied tubular steel arch (CFTA) under static loading. Manufacturing of the CFTA girder may have defects which may highly affect the symmetry and performance of the structure. A simple method is proposed by using stiffness extracted from static test data to detect manufacturing defects of the CFTA girder. A three-dimensional finite element model was used in the numerical analysis in order to verify the method. The proposed method was experimentally validated through static tests of the CFTA girder. The application of the proposed method showed that it is effective in identifying invisible manufacturing defects of the CFTA girder, especially for mass production of a standard type in the factory.
서형열 ( Seo Hyeong Yeol ),김두기 ( Kim Doo Kie ),취진타오 ( Cui Jintao ),박기태 ( Park Ki Tae ),이영호 ( Lee Young Ho ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
Fiber reinforced polymer(FRP) composite decks are new to bridge applications and hence not much literature exists on their dynamic behavior. As the traffic loads that bridges suffered are mainly moving loads, so the dynamic behavior of FRP decks are very important in the design of bridges using FRP decks. In this paper, a simple model was selected to make numerical simulations and experimental tests. The main interest of this research is categorized into two pats' dynamic characteristics of FRP deck and dynamic responses under moving loads. In the dynamic characterization, the comparison of the natural frequencies under different boundary conditions shows that boundary condition is one of factors that have great effect on the natural frequencies. To obtain the frequency response function (FRF) from testing data is a valid way to verify the corresponding numerical model. In the part of dynamic response under moving load, there were shifts between results obtained by numerical analysis and experimental tests, which are mainly because the load applied in numerical analysis was different from the actual load.
Dynamic behavior of an FRP Deck under Moving Wheel Loading : 윤하중을 받는 FRP바닥판의 동적거동에 관한 연구
서형열(Seo Hyeong Yeol),김두기(Kim Doo Kie),취진타오(Cui Jintao),박기태(Park Ki Tae),이영호(Lee Young Ho) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
Fiber reinforced polymer(FRP) composite decks are new to bridge applications and hence not much literature exists on their dynamic behavior. As the traffic loads that bridges suffered are mainly moving loads, so the dynamic behavior of FRP decks are very important in the design of bridges using FRP decks. In this paper, a simple model was selected to make numerical simulations and experimental tests. The main interest of this research is categorized into two pats: dynamic characteristics of FRP deck and dynamic responses under moving loads. In the dynamic characterization, the comparison of the natural frequencies under different boundary conditions shows that boundary condition is one of factors that have great effect on the natural frequencies. To obtain the frequency response function (FRF) from testing data is a valid way to verify the corresponding numerical model. In the part of dynamic response under moving load, there were shifts between results obtained by numerical analysis and experimental tests, which are mainly because the load applied in numerical analysis was different from the actual load.