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긴장재 배치에 따른 PT슬래브공법의 효율성에 관한 연구
김강수(Kim Kang-Su),이득행(Lee Deuck-Hang),김상식(Kim Sang-Sik),김창혁(Kim Chang-Hyuk),박정우(Park Jung-Woo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.9
The post-tension (PT) method is generally regarded as a good alternative to solve out the excessive deflection problem in reinforced concrete (RC) structures. Despite this good advantage, however, the application of PT method has been very limited in domestic market due to the unfavorable circumstances such as cost increase, technical problems, and lack of experiences in domestic construction. For the expansion of application of PT method in domestic market, therefore in this research, the influences of structural members and tendon directions on the effective prestress were analyzed, and the efficiency of deflection control by various tendon layout was evaluated. Also, the best layouts of tendons for a construction project was derived and the economic efficiency of PT method was evaluated considering the cost of marterials and construction. In this study, it is confirmed that PT method is very efficient for reducing both deflection and member size. The results of this study also indicated that the partial PT method with top anchorage can be very useful for deflection control, with reasonably small cost increase, in the part of span where large deflection is anticipated.
김강수(Kim Kang-Su),이득행(Lee Deuck-Hang),주현진(Ju Hyun-Jin) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.2
Current codes of practice have specified the minimum and maximum shear reinforcement ratio to prevent the brittle shear failure of reinforced concrete members. These limits on shear reinforcement, however, are significantly different, and cannot consider the effect of longitudinal reinforcement ratio and shear span ratio on the shear reinforcement limits. Thus, this study proposed the minimum and maximum shear reinforcement ratio considering these influencing factors, and compared to test data from previous studies and other approaches. The analysis results imply that the proposed limits on shear reinforcement are very rational and proper for reinforced concrete members having various concrete compressive strengths and longitudinal reinforcement ratios.