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강섬유보강 콘크리트를 사용한 무배근 연속슬래브의 구조성능
홍건호(Hong, Geon-Ho) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.8
Slab is one of the most important members in the building structures because it covers the largest area of the building. But, amount of reinforcement in this member is relatively small because of its small supporting loads. And large exposed area in slab can induce the cracks. To improve this characteristics, the new slab system consist of structural deck-plate and fiber reinforced concrete was suggested for improving construction ability and reduction of construction period. Basic concept of this slab system is that structural deck-plate can replace the tensile reinforcing bars and concrete form, and fiber reinforced concrete can replace the temperature reinforcement. But, previous study was limited because it tested only simply supported slab specimens. This study tested various continuous slab specimens to find the applicability of the suggested new slab system without any additional reinforcement. Design concept is that structural design of slab is assumed as simply support slab, but it should keep the negative moment cracks under allowable crack width in service load conditions. Four continuous slab specimens in total were tested for analyzing the flexural strength, stiffness, deflection, crack development and failure pattern. Test results indicated that suggested new slab system appeared to be better flexural capacity and stiffness than normal reinforced concrete slab with negative moment reinforcement. And it can control the cracks under the allowable crack width upto the service and factored loads.
고장력철근을 사용한 철근콘크리트 보의 겹침이음 성능평가
홍건호(Hong Geon-Ho) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.7
The purpose of this study was to analyze the problems of the bond performance between re-bar and concrete when the yield strength increase up to 600 or 700 ㎫, and to evaluate the suitability of present design code about development and splice to high strength reinforcement. Total 6 simple beam specimens which had lap splice in the center were tested for evaluating the bond properties of high strength reinforcement. Main test variables were compressive strength of concrete and yield strength of reinforcement, and test results analyzed in the viewpoint of maximum strength, bond stress, load-deflection relationship, strain of the reinforcement, crack progress and failure aspects. Test results indicated that properties of load-deflection relationship, crack and failure aspects were very similar regardless of yield strength of reinforcement, and maximum strength and bond stress of specimens using SD600 met the requirements of present design code. But, the checkup of bond performance reduced by concentration of bond stress to the loading side will be needed in the case of using SD700 grade high strength reinforcement and high strength concrete simultaneously.