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Title |
Shear Behavior of Post-tensioning PSC Beams with High Strength Shear Reinforcement
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Authors |
전병구(Byung-Koo Jun) ; 이재만(Jea-Man Lee) ; 임혜선(Hye-Sun Lim) ; 이정윤(Jung-Yoon Lee) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.1.033 |
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Keywords |
전단보강철근 항복강도 ; 고강도 ; 프리스트레스트 콘크리트 보 ; 사인장균열 ; 전단 설계 shear reinforcement ; high strength ; prestressed concrete beams ; diagonal crack width ; shear design |
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Abstract |
The KCI-12 and ACI 318-14 design codes limit the maximum yield strength of shear reinforcement to prevent concrete compressive crushing before the yielding of shear reinforcement. The maximum yield strength of shear reinforcement is limited to 420 MPa in the ACI 318-14 design code, while limited to 500 MPa in the KCI-12 design code. A total of eight post-tensioning prestressed concrete beams with high strength shear reinforcement were tested to observe the shear behavior of PSC beams and the applicability of the high strength reinforcement was thus assessed. In the all PSC beam specimens that used stirrups greater than maximum yield strength of shear reinforcement required by the ACI 318-14 design code, the shear reinforcement reached their yield strains. The observed shear strength of tested eight PSC beams was greater than the calculated ones by the KCI-12 design codes. In addition, the diagonal crack width of all specimens at the service load was smaller than the crack width required by the ACI 224 committee. The experimental and analytical results indicate that the limitation on the yield strength of shear reinforcement in the ACI 318-14 design code is somewhat under-estimated and needs to be increased for high strength concrete. Also the application of high strength materials to PSC is available with respect to strength and serviceability.
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