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Title |
Shear Strength of Prestressed PC-CIP Composite Beams with Vertical Shear Reinforcement
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Authors |
서정일(Jung-Il Suh) ; 박홍근(Hong-Gun Park) ; 홍건호(Geon-Ho Hong) ; 강수민(Su-Min Kang) ; 김철구(Chul-Goo Kim) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2015.27.4.399 |
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Keywords |
전단 강도 ; 프리스트레스 콘크리트 ; 프리캐스트 콘크리트 ; 합성보 ; 수평전단 shear strength ; prestressed concrete ; precast concrete ; composite beam ; horizontal shear |
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Abstract |
Recently, the use of composite construction method using precast (PC) and cast-in-place (CIP) concrete is increased in modular construction. For PC members, pre-tensioning is used to improve efficiency of the structural performance. However, current design codes do not clearly define shear strength of prestressed PC-CIP composite members. In this study, 22 specimens were tested to evaluate shear strength of prestressed composite members with vertical shear reinforcement. The test variables were the area ratio of high-strength (60 MPa) to low-strength concrete (24 MPa), prestressing force of strands, shear span-to-depth ratio(a/d), and vertical shear reinforcement ratio. The test results showed the prestressing force did not completely restrain diagonal cracking of non-prestressed concrete in the web. Thus, the effect of prestress force was not insignificant in the effect for monolithic beams. The vertical shear strength and horizontal shear strength of the composite beams were compared with the strength predictions of KCI design method.
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