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Title |
Effect of Shear Reinforcement and Compressive Stress on the Shear Friction Strength of Concrete
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Authors |
황용하(Yong-Ha Hwnag) ; 양근혁(Keun-Hyeok Yan) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.4.419 |
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Keywords |
shear friction strength ; relative slippage ; transverse reinforcement ; compressive stress ; unit weight of concrete |
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Abstract |
This study examined the effect of transverse reinforcement and compressive stress on the shear friction performance at the shear interface intersecting two structural elements with various concrete types. From the prepared 12 push-off test specimens, various characteristics at the interface were measured as follows: crack propagation, shear load-relative slip relationship, initial shear cracking strength, ultimate shear friction strength, and shear transfer capacity of transverse reinforcement. The configuration of transverse reinforcement and compressive strength of concrete insignificantly influenced the amount of relative slippage at the shear friction plane. With the increase of applied compressive stress, the shear friction capacity of concrete tended to increase proportionally, whereas the shear transfer capacity of transverse reinforcement decreased, which was insignificantly affected by the configuration type of transverse reinforcement. The empirical equations of AASHTO-LRFD and Mattock underestimate the shear friction strength of concrete, whereas Hwang and Yang model provides better reliability, indicating that the mean and standard deviation of the ratios between measured shear strengths and predictions are 1.02 and 0.23, respectively.
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