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BROWSE대한건축학회 논문집(구조계)2018-11 > DETAIL
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Title   사전균열이 발생한 철근콘크리트 보의 외적 포스트텐셔닝 전단보강에서 보강깊이의 효과 / Strengthening Depth Effect in Externally Post-tensioning Shear Strengthening of Pre-cracked Reinforced Concrete Beam
Authors   이수헌(Lee, Swoo-Heon) ; 신경재(Shin, Kyung-Jae) ; 이희두(Lee, Hee-Du)
Organization   대한건축학회
Source   대한건축학회논문집 구조계, Vol.34 No.11(2018-11)
Page   Start Page(19) Total Page(8)
ISSN   1226-9107
Classification   구조  
Keywords   철근콘크리트 보 ; 외적 포스트텐셔닝 ; 전단보강 ; 보강깊이 ; 사전균열//Reinforced Concrete Beam ; Externally Post-tensioning ; Shear Strengthening ; Strengthening Depth ; Pre-cracked
Abstract2   This paper presents the shear strengthening effect of externally post-tensioning (EPT) method using high-strength steel rod in pre-cracked reinforced concrete (RC) beams. Three- and four-point bending tests were performed on a total of 8 specimens by adjusting the strengthening depths in the deviator position of EPT. The effective strengthening depths were 435, 535, and 610mm. The pre-loading up to about 2/3 of ultimate load capacity measured in unstrengthened RC beam were applied in the beam to be post-tensioned. The EPT method was then applied to the pre-damaged RC beams and re-loading was added until the end of the test. EPT restored deflections of 3 mm or more, which account for about 40% of deflection when the pre-loading was applied. The shear strengthening increases more than 3 times and 36~107% in terms of the stiffness and load-carrying capacity compared to unstrengthening RC beams. The increased load-carrying capacities of the post-tensioned beam with strengthening depths of 435 and 535mm are almost the same as 36~61%, and those of 610 mm are 84~107%, which shows the greatest shear strengthening effect.
Location   대한건축학회