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Lap Details Using Headed Bars and Hooked Bars for Flexural Members with Different Depths
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 Title & Authors
Lap Details Using Headed Bars and Hooked Bars for Flexural Members with Different Depths
Lee, Kyu-Seon; Jin, Se-Hoon; Kim, Seung-Hun;
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 Abstract
This paper focuses on the experimental study for investigating the performance for lap splice of hooked or headed reinforcement in beam with different depths. In the experiment, seven specimens, with its variables as the lap length of headed or hooked bar, the existence of stirrups, etc., was manufactured. Bending test was conducted. Lap strengths by test were compared with the theoretical model based on KCI2012. The result showed that the cracks at failure mode occurred along the axial direction to a headed bar. The initial stiffness and the stiffness after initial crack were similar for all specimens. For HS series specimens without stirrups, a 25% increase in lap length was increased 11.8~18.1% maximum strengths. For HH series specimens without stirrups, a increase in lap length did not affect the maximum strengths because of the pryout failure of headed bar. For HS series specimens, the theoretical lap strengths based on KCI2012 considering the B grade lap and the reduction factor for stirrup were evaluated. They are smaller than the test strengths and can ensure the safety in terms of strength capacity. For HH series specimens, the stirrups in the lap zone are needed to prevent the pryout behaviour of headed bar.
 Keywords
Headed bars;Hooked bars;Lap splice;Different depths;Reinforced concrete;
 Language
Korean
 Cited by
 References
1.
ACI318 (2008), Building Code and requirements for structural concrete (ACI318-08), American Concrete Institute, 210-212.

2.
ACI318 (2014), Building Code and requirements for structural concrete (ACI318-14), American Concrete Institute, 420-423.

3.
Chun, S. C., and Lee, J. G. (2013), Strengths of Lap Splices Anchored by SD600 Headed Bars, Journal of the Korea Concrete Institute, 25(2), 217-224. crossref(new window)

4.
KCI2012 (2012), Korean Building Code, 149-150.

5.
Kim, S. H. (2015), Experimental Study on Effect of Confinement Details for Lap Splice of Headed Deformed Reinforcing Bars in Grade SD400 and SD500, Journal of the Korea Institute for Structural Maintenance and Inspection, 19(1), 62-71. crossref(new window)

6.
KSEA (2009), KSEA Detailing Manual-2009, The Korean Structural Engineers Association, 86.