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유영찬 ( You Young Chan ),이현지 ( Lee Hyun Jee ),신지욱 ( Shin Ji Uk ),김민선 ( Kim Min Sun ),최기선 ( Choi Ki Sun ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
This paper presents the basic data for the structural safety study of the extension wall by evaluating the bending stresses of the existing and extension walls varying according to the plan change of the extension building through the numerical analysis on the horizontal load as follows: 1) the stress variation of the divided wall when the wall opening due to a partial demolition is evaluated by comparing the result of analysis on whether or not the opening of the bearing wall is demolished as a variable; 2) the stress variation of the existing wall due to the increase of the stiffness of the extension wall is also evaluated by comparing the result of analysis on the thickness of the extension wall as a variable.
RC部材의 휨보강용 炭素纖維쉬트의 部分減少係數 算定을 위한 變數 硏究
유영찬(You. Young-Chan),최기선(Choi. Ki-Sun),김긍환(Kim. Keung-Hwan) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.7
In recent years, Carbon fiber sheet(CFS) which has advantages of high strength, lightness and high durability has been<br/> developed and widely used. In the strength design approach, the design flexural strength of a RC member strengthened<br/> with CFS must exceed its required strength. Design flexural strength refers to the nominal strength of a member<br/> multiplied by strength reduction factor, but the additional strength reduction factor must be applied to the flexural<br/> contribution of CFS to account for lower reliability of FRP reinforcement, as compared with internal steel reinforcement.<br/> According to the previous researches, strength reduction factor of 2/3 or 0.7 for the CFS is suggested by JCI design<br/> guideline and AIK technical reports, respectively.<br/> This study investigated 284 specimens and analyzed 57 specimens whose final failure was governed by the rupture of<br/> CFS among them. Each specimen was grouped in terms of CFS ply, sheet thickness, end anchorage, loading type, specimen<br/> scale, etc. From the analysis, it was found that total thickness of CFS expressed by the number of CFS ply was the most<br/> governing factor in determining the partial strength reduction factor. And the existing partial reduction factor of JCI<br/> recommendation or AIK reports is unconservative in case of being strengthened with more than 3 plies of CFS.
유리 섬유복합체(GFRP) 전단연결재로 보강된 중단열 콘크리트 월 패널의 단열재 종류에 따른 휨 거동 분석
유영찬(You, Young-Chan),김준희(Kim, Jun-Hee),김호룡(Kim, Ho-Ryong),최기선(Choi, Ki-Sun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.11
This paper describes a full-scale experimental program to investigate the structural behavior of insulated concrete sandwich wall panels (SWPs). Main test variables are types of insulation and the number of glass fiber reinforced polymer (GFRP) shear grids. Expanded polystyrene (EPS) and extruded polystyrene (XPS) with the same thickness of 100 ㎜ and Vacuum Insulation panel(VIP) with the thickness of 60 ㎜ are used to satisfy the building insulation requirement in Korea. Various number of GFRP shear grids are used to examine the degree of composite action of two concrete wythes. Each test result is compared with a fully-composite wall panel specimen, which has solid concrete core between concrete wythes. Fifteen SWPs were tested under displacement control subjected to four point concentrated loads. According to the test results, the specimens with EPS exhibit an enhanced load-displacement behavior in comparison with the specimens with XPS because of the relatively high surface roughness of EPS form. Most of specimen failed in the loss of shear-frictional capacity between concrete and insulation followed by rupture of GFRP shear grids. The specimen reinforced with four GFRP shear grids along the shear spans, however, exhibited a full composite behavior up to flexural failure. Based on the test results, the SWPs reinforced with GFRP grids as shear connectors hold an enhanced flexural capacity by developing a high degree of composite action.