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Title |
Experimental Study on Lap Splice of Headed Deformed Reinforcing Bars in Tension
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Keywords |
확대머리 이형철근 ; 철근콘크리트 보 ; 겹침이음 ; 정착 ; 겹침이음길이 ; Headed reinforcing bar ; Reinforced concrete beam ; Lap splice ; Anchorage ; Lap length |
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Abstract |
In tension lap splices of straight deformed bars, KCI Code (KCI2012) and ACI Code (ACI318-11) requires that the lap lengths for class B splice are 1.3 times as development length. KCI2012 contains development length provisions for the use of headed deformed bars in tension and does not allow their tension lap splices. The purpose of this experimental study is to evaluate that KCI2012 equation for the development length, ldt, of headed bars can be used to calculate the lap length, ls, of headed deformed bars in grade SD400 and SD500, having specified yield strength of 400 and 500 MPa. Test results showed that specimens with ls equal to 1.3 ldt had maximum flexural strengths as 1.16~1.31 times as the nominal flexural strengths, flexural failure mode, and ductility. These observations indicate that 1.3 ldt is suitable to the tensile lap length of headed deformed bars in grade SD400 and SD500.
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