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노후화된 교량 바닥판 대체용 복합재료 교량 바닥판의 거동에 관한 실험적 연구
지효선,손병직,장석윤,Ji, Hyo Seon,Son, Byung Jik,Chang, Suk Yoon 한국강구조학회 2001 韓國鋼構造學會 論文集 Vol.13 No.6
본 연구에서는 노후화된 교량 대체용으로 복합재료 교량 바닥판의 거동에 대하여 실험적인 방법으로 조사하였다. 바닥판의 성능평가와 관련하여 총 5개의 시험체를 1/10 축소모형 시험체로 제작하고 실험을 실시하였다. 3개의 시험체는 강성을 확보키 위해 알루미늄 코아를 갖는 샌드위치 상부플랜지와 라미네이트(Laminate) 상부플랜지 형식 2개, 총 5개의 시험체를 제작 하였다. 바닥판 구성요소는 유리섬유와 에폭시재료(glass fiber/epoxy)를 사용하여 제작하였다. 시험체의 최대내력, 강성 및 변형성능에 대한 결과를 요약하였다. 또한 실험결과의 타당성을 검증하고자 유한요소해석의 결과와 비교하였다. The behavior of composite materials bridge decks for use in deteriorated bridge decks replacement are investigated experimentally in this study. As for the performance evaluation of bridge decks, experimental studies on the 5 test specimens with 1/10 scale of full size were carried out. Three specimens were fabricated from sandwich upper flange and two specimens were fabricated from laminated upper flange. The constituents of bridge decks were glass fiber performs and epoxy resin. The experimental results, i.e., the maximum strength stiffness, stiffness, and deformation capacity, were summarized. The results of the finite element analysis were compared with the experimental results for the verification of validity.
지효선,장석윤,JI, Hyo Seon,Chang, Suk Yoon 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.1
복합샌드위치평판은 복합재료를 갖으면서 강성이 있는 얇은 면재와 저밀도인 두꺼운 심재로 구성되어 있다. 본 연구에서는 국부전단변형을 고려한 복합면재를 갖는 샌드위치평판을 해석을 위한 지배방정식을 유도하였고, 해석적인 방법으로 해석을 하였다. 해석방법의 타당성을 확인하기 위하여 전체 전단변형을 고려한 일반 적층판 이론의 값과 비교하였다. 그리고 복합면재와 심재의 국부전단변형을 고려하였으므로 일반 적층판 해석에도 적용시킬 수 있음을 보였다. The composite sandwich plate is constructed by combining two laminated facings with high strength and a thick core of light weight material. The governing equations for the analysis of bending of simply supported sandwich plates with laminated facings are derived and analysed using the analytical method including the local shear deformations. The accuracy of the approach is ascertained by comparing solutions from the sandwich plate theory with composite facings to the laminate plate theory. Since the present analysis considers the bending stiffness of the core and also the transverse shear deformations of the laminated facings, it is expected that the analysis is capable to analyze the general anisotropic laminated plates with global shear deformations.
Bending Analysis of Anisotropic Sandwich Plates with Multi-layered Laminated Composite faces
지효선,Ji, Hyo-Seon Korean Society for Advanced Composite Structures 2012 복합신소재학회논문집 Vol.3 No.4
This study presents a governing equations of bending behavior of anisotropic sandwich plates with multi-layered laminated composite faces. Based on zig-zag models for through thickness deformations, the shear deformation of composite faces is included. All edges of plate are assumed to be simply supported. Results of the bending analysis under lateral loads are presented for the influence of various lay up sequences of antisymmetric angle-ply laminated faces. The accuracy of the approach is ascertained by comparing solutions from the sandwich plates theory with composite faces to the laminated plates theory. Since the present analysis considers the bending stiffness of the core and also the transverse shear deformations of the laminated faces, the proposed method showed higher than that calculated according to the general laminated plates theory. The information presented might be useful to design sandwich plates structure with polymer matrix composite faces.