전단철근이 배치된 프리캐스트 프리스트레스트 중공슬래브의 구조성능 평가
Evaluation of Structural Performance of Precast Prestressed Hollow-Core Slabs with Shear Reinforcement
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초록
이 연구에서는 높이가 400 ㎜인 중공슬래브(Hollow-Core Slab, 이하 HCS)의 구조성능을 평가하기 위한 실대형 실험을 수행하였으며, 기존의 압출성형방식이 아닌 단일몰드방식을 적용하여 총 4개의 HCS를 제작하였다. 실험의 주요 변수는 토핑콘크리트의 유무, 전단보강근의 배치 유무 및 위치로 설정하였으며, 실험체들의 균열패턴 및 하중-변위 응답을 상세히 분석하였다. 실험결과 전단철근이 배치된 HCS 실험체들은 휨강도를 달성하였고, 이후에 최종적인 파괴는 사인장균열에 의하여 지배되었으며, HCS 유닛 웨브 내에 전단철근이 배치되지 않은실험체들의 경우 설계기준을 통해 산정된 공칭휨강도를 발현하지 못하였다. 전단철근을 HCS 유닛에 배근 할 경우에는 전단강도가 약 8~23%증가하는 것으로 나타났으며, HCS의 중공을 철근콘크리트로 보강하는 방법보다 전단성능 향상에 더 효과적인 것으로 나타났다.
Abstract
This study aims to investigate the structural performance of hollow-core slab (HCS) memebers with 400 ㎜ thickness. To this end, a totalof four HCS specimens were fabricated based on the individual mold method to provide shear reinforcement, unlike the extrusion method. The keyvariables were chosen as the presence of topping concrete, core-filling concrete, and shear reinforcements. The crack patterns and load-displacementresponses of the test specimens were analyzed in detail. Test results showed that inclined shear cracking occurred all the specimens, and that the specimenwith shear reinforcement on the web of HCS unit had higher strength and ductility than the specimen without shear reinforcement. In particular, shearreinforcements placed on the web of HCS unit effectively resisted not only to vertical shear force but also to horizontal shear force between the interfaceof HCS unit and topping concrete. In addition, it was discovered that the method in which shear reinforcements are placed on the web of HCS unitis more effective in improving structural performance than core-filling method
참고문헌 (9)
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