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Title |
Evaluation of Bond Performance of Reinforcing Bars
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Authors |
김민희(Min-Hee Kim) ; 김철구(Chul-Goo Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.4.455 |
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Keywords |
저강도 콘크리트; 부착성능; 철근 인발실험; 뽑힘파괴; 부착길이 low-strength concrete; bond performance; pull-out test; pullout failure; bond length |
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Abstract |
The behavior of reinforced concrete structures strongly depends on the bond performance between reinforcing bars and concrete. Low compressive strength can lead to brittle failure due to deterioration of bond performance. In this study, 20 pullout tests were conducted to quantitatively evaluate the bond performance of low-strength concrete, with concrete compressive strength (C10, C14, C17, C21, and C26), rebar diameter (D10 and D13), and bond length(10db and 15db) as test variables. The results showed that both the average bond stress at the first free-end slip and the maximum average bond stress generally increased with increasing compressive strength. In addition, higher compressive strength and longer bond length tended to result in bond failure after yielding of the rebar. However, at concrete compressive strength levels in the range of 10~14 MPa, sufficient bond performance to allow the rebar to develop its tensile capacity could not be achieved. A comparison with an empirical bond strength equation, which was derived from pullout test data, revealed that the equation tends to overestimate bond strength in the low-strength concrete range, and that a nonlinear consideration of bond length is required.
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