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Journal of the Korean Society of Hazard Mitigation 2015;15(6):43-54.
Published online December 30, 2015.
프리스트레싱을 하지 않은 철근콘크리트 일방향 중공슬래브의 전단강도 평가
엄태성, 황인혜, 박태원
Evaluation of Shear Strength of Non-prestressed Reinforced Concrete Hollow-Core Slabs
Tae Sung Eom, In Hye Hwang, Tae Won Park
Abstract
In Korea, non-prestressed reinforced concrete hollow-core slab construction method has been developed and used in construction fields. Provisions for the shear strength of hollow-core slabs based on the effective width of web (bw), which are specified in current design codes, are too conservative and cannot consider accurately the effects of properties of hollow cores. In this study, the shear performance of one-way RC hollow-core slabs was investigated. Two-point loading simple beam tests were performed for ten hollowcore slabs with a thickness of 300 mm and a width of 600 mm, designed to fail in shear or flexure.
Results
showed that the shear strength of hollow-core slab was degraded as the void ratio increased but hardly affected by other factors including the effective width of web. Shear strengths of the hollow-core slabs estimated by KCI 2012, ACI 318-11, Eurocode 2, and CSA A23.05 were compared with the test strengths. In addition, based on the test observations, the shear resistance of the hollow-core slabs was estimated by using the shear-tension failure theory for the concrete compression zone subjected to biaxial plane stresses.
Key Words: Shear strength; Hollow-core slab; Reinforced concrete; Shear failure; Beam
요지
국내에서는 프리스트레싱을 하지 않은 RC 중공슬래브 공법이 개발되어 현장에 사용되고 있다. 현행 설계기준에 따라 복부 유효폭(bw)을 바탕으로 계산된 RC중공슬래브의 전단강도는 지나치게 보수적이고, 중공재 특성의 영향을 합리적으로 고려하지 못한다. 이 연구에서는 1방향 RC중공슬래브의 전단성능을 연구하였다. 휨파괴 또는 전단파괴가 발생하도록 설계된 두께 300 mm, 폭 600 mm의 중공슬래브 실험체 10개를 제작하여 2점 가력 단순보 실험을 수행하였다. 실험결과, RC중공슬래브의 전단강도는 중공률이 클수록 전단강도가 감소하였지만, 복부 유효폭(bw)을 포함한 다른 요인들은 거의 영향을 미치지 못하였다. KCI 2012, ACI 318-11, Eurocode 2, CSAA23.05 등 현행 설계기준에 따라 예측된 중공슬래브 실험체의 전단강도를 실험강도와 비교하였다. 또한 실험 관찰을 바탕으로 이축평면응력이 작용하는 콘크리트 압축대의 전단-인장 파괴이론을 사용하여 RC중공슬래브 실험체의 전단강도를 평가하였다.
핵심용어: 단강도; 중공슬래브; 철근콘크리트; 전단파괴;


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