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장방형 단면을 갖는 프리텐션부재의 프리스트레스 도입시 허용압축응력
이정연,이득행,김강수,황진하,임주혁,이진섭,Lee, Jeong-Yeon,Lee, Deuck-Hang,Kim, Kang-Su,Hwang, Jing-Ha,Lim, Joo-Hyuk,Lee, Jin-Seop 대한건축학회 2011 대한건축학회논문집 Vol.27 No.5
Prestressed concrete structural system is the one of the best alternatives to satisfy deflection requirements for the long and slender span members. Especially, pre-tension member can be precasted at factory that reduces construction waste by minimizing the onsite work and construction duration, which is considered as an eco-friendly and economical structural method. However, the economic efficiency of the pre-tension system heavily depends on the transfer time as the pre-tensioned member need to acquire an proper compressive strength at transfer. Unfortunately, the allowable compressive stresses in many codes of practice are based on only experience without theoretical consideration, which also are often very conservative. To solve out such problems, this research proposed the allowable compressive stress based on ultimate strength design method, considering main variables such as shapes of cross section, intensity of prestress, and eccentricity of tendons.
장방형 단면을 갖는 프리텐션부재의 프리스트레스 도입시 허용압축응력
이정연(Lee Jeong-Yeon),이득행(Lee Deuck-Hang),김강수(Kim Kang-Su),황진하(Hwang Jing-Ha),임주혁(Lim Joo-Hyuk),이진섭(Lee Jin-Seop) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.5
Prestressed concrete structural system is the one of the best alternatives to satisfy deflection requirements for the long and slender span members. Especially, pre-tension member can be precasted at factory that reduces construction waste by minimizing the onsite work and construction duration, which is considered as an eco-friendly and economical structural method. However, the economic efficiency of the pre-tension system heavily depends on the transfer time as the pre-tensioned member need to acquire an proper compressive strength at transfer. Unfortunately, the allowable compressive stresses in many codes of practice are based on only experience without theoretical consideration, which also are often very conservative. To solve out such problems, this research proposed the allowable compressive stress based on ultimate strength design method, considering main variables such as shapes of cross section, intensity of prestress, and eccentricity of tendons.
이득행(Lee Deuck-Hang),김강수(Kim Kang-Su),김상식(Kim Sang-Sik),박정우(Park Junng-Woo),최일섭(Choi Il Sup),임주혁(Lim Joo-Hyuk) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Post-tension (PT) slabs are generally classified by the tendon lay-out as concentrated type, distributed type, and combination type, whose deflection depends on the tendon lay-out and its amount. Finite element analysis were performed to analyze the efficiency of deflection control by primary parameters; distribution types of tendons and ratios of prestressed reinforcement. Based on analysis results, economic efficiency was estimated considering both material and construction cost. In this study, the increase of construction cost and the efficiency of deflection control by partial PT method with top anchorage were also included. The results of this study indicate that the partial PT method with top anchorage is very efficient for deflection control and can save the amount of tendon by applying tendons in a part of span required due to large deflection anticipated. The application of the partial PT method with top anchorage increase the construction cost about 6% compared to that in RC structure, which is considered to be reasonable cost for the important deflection control.