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주형중,이영근,이동혁,윤순종,Joo, Hyung-Joong,Lee, Young-Geun,Lee, Dong-Hyuk,Yoon, Soon-Jong 한국강구조학회 2012 韓國鋼構造學會 論文集 Vol.24 No.5
기존 임시교량은 대부분 거더의 횡-비틀림좌굴을 방지하고 시공의 효율성을 확보하기 위해 가로보를 설치하고 있다. 이 가로보는 볼트로 연결되며, 중력방향 하중에 대한 저항성능이 매우 작은 것으로 평가되고 있다. 그러나 최근 일체화된 가로보를 사용함으로써 가로보를 하중저항요소로 이용한 임시교량이 최근 개발된 바 있다. 이 연구는 새롭게 개발된 임시교량에 대한 구조적 거동 및 하중전달능력을 실험 및 구조해석 등을 통해 조사, 분석하였다. 일체로 연속된 가로보를 이용한 임시교량은 가로보의 휨강성을 통해 하중을 인접거더로 분산하여 거더에 발생하는 최대휨응력을 감소시키고, 거더의 휨강성을 증대시키는 것으로 확인되어 장경간 임시교량에서도 유리할 것으로 판단된다. Cross-beam in the existing temporary bridge system is usually installed to prevent the lateral-torsional buckling of girders and to promote the construction efficiency. However, most of this cross-beams are connected to the girder web by bolts, and therefore, gravitational load resisting capacity of the cross-beams are negligibly small. In recent years, new temporary bridge system, in which the cross-beams and girders are connected to resist the external loads as a unit, was developed. In this paper, we present the experimental and analytical study results pertaining to the structural behavior and load carrying capacity of new temporary bridge system. From the results of study, it was found that the continuous cross-beam increased the flexural rigidity and reduced the maximum flexural stress in the girder. In addition, it was also found that the new temporary bridge system developed is more appropriate for the application in the long-span temporary bridge.
노후 강교량의 내하력 향상을 위한 외부긴장력 도입방법에 관한 연구
주형중 ( H. J. Joo ),박정환 ( J. H. Park ),정재호 ( J. H. Jung ),김상석 ( S. S. Kim ),윤순종 ( S. J. Yoon ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
In this paper, we discussed the external post-tensioning utilized to improve the load carrying capacity of deteriorated steel-concrete composite bridges. Steel-concrete composite plate girder with external post-tensioning which installed underneath the tension flange of I-girder was modeled and analyzed using the elastic beam-column theory. The location of post-tensioning device installation and the magnitude of post-tensioning force are the parameters in the analysis. From the study, it was found that the location and magnitude of external post-tensioning force is important. To strengthen the deteriorated steel-concrete bridge bridges, accurate estimation technique of the local load carrying capacity of the deteriorated bridges must be established prior to develop the effective way of strengthening or recovering the deficiency of capacity. This paper may contribute to establishing the reliable design guidelines.
주형중 ( Hyung Joong Joo ),이승식 ( Seung Sik Lee ),이종석 ( Jong Seok Yi ),윤순종 ( Soon Jong Yoon ) 한국복합재료학회 2012 Composites research Vol.25 No.2
펄트루젼 공정에 의해 생산된 FRP 부재는 길이에 제한이 없이 임의의 단면형상으로 제작할 수 있기 때문에 건설 구조용 부재로 사용하기 적합하며, 특히, 각종 화학적 유해환경 등에서 그 성능이 우수하기 때문에 습윤환경 및 해양환경 등의 부식환경에서 그 활용이 두드러지고 있다. 그러나 설계를 위한 관련 규준이 마련되어 있지 않아 이에 대한 연구가 시급한 실정이다. FRP 구조재는 대부분 단면의 효율적 사용을 위해 판요소로 구성된 박판부재를 사용하고 있으며, 이러한 부재를 압축재로 사용할 경우 강도한계상태는 주로 좌굴거동에 의해 결정된다. 이 연구에서는 FRP I형 단면 압축재에 대한 좌굴거동을 이론적으로 해석하였고, 기존 실험적 연구결과와 비교, 분석하여 설계방법 및 설계흐름도를 제안하였다. 제안된 설계방법은 ANSI/AISC 360-10의 방법과 유사한 형태로서 설계자의 편의를 도모하였으며, 비교적 간단한 방법에 의해 PFPR I형 단면 압축재의 설계를 수행할 수 있도록 하였다. Using pultrusion process, FRP composite structural members having various cross-section shapes can be produced with unlimited lengths. Because of such reasons, these members are suitable for the application in the construction field. Especially, this material is highly appreciated if the material is to be used in the corrosive environments such as aquatic or oceanic environments due to its high corrosion resistance. However, design criteria for the FRP structural member are not developed yet. So, the research on the evelopment of design guideline is needed ungently. In order to use the pultruded structural FRP member efficiently, the members are composed of thin plate components, and thus, the member is prone to buckle easily and the buckling is one of the governing strength limit states for the design. In this paper, we present the analytical study results pertaining to the buckling behavior of I-shape FRP compression member. In addition, design procedure and flow-chart are also proposed based on the study results including previous experimental results. Proposed design procedure is similar to that in ANSI/AISC 360-10 with minor modification. Therefore, it is convinced that the structural design of pultruded FRP compression member could be done easily by following design procedure proposed in this paper.
노후 강교량의 내하력 향상을 위한 외부긴장력 도입방법에 관한 연구
주형중(H.J.Joo),박정환(J.H.Park),정재호(J.H.Jung),김상석(S.S.Kim),윤순종(S.J.Yoon) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
In this paper, we discussed the external post-tensioning utilized to improve the load carrying capacity of deteriorated steel-concrete composite bridges. Steel-concrete composite plate girder with external post-tensioning which installed underneath the tension flange of I-girder was modeled and analyzed using the elastic beam-column theory The location of post-tensioning device installation and the magnitude of post-tensioning force are the parameters in the analysis From the study. It was found that the location and magnitude of external post-tensioning force is important To strengthen the deteriorated steel-concrete bridge bridges, accurate e timation technique of the local load carrying capacity of the deteriorated bridges must be established prior to develop the effective way of strengthening or recovering the deficienc. of capacity This paper may contribute to establishing the reliable design guidelines