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철근 콘크리트 기둥의 2축휨 강도에 영향을 미치는 변수 고찰
유석형 ( Yoo Suk-hyung ),반병열 ( Bahn Byong-youl ),신성우 ( Shin Sung-woo ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.2
In the PCA Load Contour Method, the biaxial bending design coefficient of columns(β) is based on the equivalent rectangular stress block (RSB). And coefficient of β estimates the reinforcement index to be a influencing parameter on biaxial moment strength of RC columns without considering the arbitrary condition of bar arrangement. The experimental results of high strength concrete (HSC) columns subjected to combined axial load and biaxial bending moment were compared to the analysis results of RSB method. As result, the accuracy of RSB method is still acceptable for HSC columns and, as the reinforcement is placed densely in each corner of column section, the β is decreased.
한검욱 ( Han¸ Gum-wook ),유석형 ( Yoo¸ Suk-hyung ),한범석 ( Han¸ Beom-seok ),안종문 ( Ahan¸ Jong-moon ),이한승 ( Lee¸ Han-seung ),신성우 ( Shin¸ Sung-woo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
Corrosion of reinforcement is a major problem affecting a large number of reinforced concrete structures, this paper presents the results of an experimental study on reinforced concrete beams to determine their residual flexural capacity after undergoing different corrosion degrees (corrosion length, corrosion location, corrosion rate) of reinforcing bars. Corrosion was induced in the laboratory by an accelerated corrosion technique using two sources of external power supply. The results show marked reductions in flexural strength due to reinforcement corrosion.
이유미(Yi Yu-Mi),정재형(Jung Jae-Hyung),정철규(Jung Cheul-Kyu),유석형(Yoo Suk-Hyeong),신성우(Shin Sung-Woo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Shear wall system with outrigger, most popular structural system for controlling lateral displacement of tall buildings, is core wall, outriggers, external walls, internal walls, and partition walls called structural elements. The studies on the capacities of outrigger and core wall have been advanced. However structural elements except for that have no practical and economic guidelines for adequate design to resist lateral loads. On this account, it is necessary to investigate the effects of interaction of each wall element to lateral displacement. In this study, thickness of structural wall as well as core wall, outrigger, interaction of each wall, and design strength are used as design variables. Analysis of example structures which are a plane figure on Y type and 60 stories shear wall-outrigger system were performed and compared top drift along design variables. As results, structural elements are effective factors to control lateral displacement and core wall-external wall integration is optimum system.
철근 콘크리트 일방향 슬래브의 소성모멘트 산정에 관한 연구
신성우 ( Shin Sung-woo ),반병열 ( Bahn Byong-youl ),유석형 ( Yoo Suk-hyung ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
Reinforced concrete structures subjected to bending moment are designed, accounting for moment redistribution due to material nonlinearity at ultimate load. In case of both end fixed flexural member, 1st plastic hinge is raised at fixed ends, where maximum moment is loaded according to elastic analysis, and additional loads rotate the 1st plastic hinge without moment capacity increasing and then moments are redistributed. Yield line theory is proposed by Johansen to overcom irrational combination of elastic analysis and design accounting for material nonlinearity. This theory assumes structures to be rigid plastic and calculate plastic moment, considering for combined bending and torsion only. In this study approximate estimation for yield moment is observed theoretically and FEM analysis is executed by ANSYS program and compared with experimental results. As results moment redistribution ratio reaches 50%.
양생조건에 따른 Mass Concrete의 수화열 특성
신성우 ( Shin Sung Woo ),이광수 ( Lee Kwang Soo ),유석형 ( Yoo Suk Hyung ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
In mass concrete, thermal stresses are developed in two ways: from the dissipation of the heat of hydration and from periodic cycles of ambient temperature. At mat foundation, the temperatures of inner and external part is different in general. The temperature of inner part is mainly affected by hydration of cement and external part is by ambient temperature. Thermal gradient is one of the main reasons of thermal crack but can be controlled by surface curing condition. The purpose of this study is to observe the thermal gradient according to curing condition. Temperatures at mat foundations with different surface curing conditions are examined and FEM thermal analysis is performed. In result, as the adiabatic capacity of surface curing material is better, the thermal gradient of mass concrete is steeper.