Title:
Interfacial Bond Analysis of Deformed Bars to Concrete
Author(s):
Oan Chul Choi and Woong Se Lee
Publication:
Structural Journal
Volume:
99
Issue:
6
Appears on pages(s):
750-756
Keywords:
bond; concrete; cover; deformation; slip.
DOI:
10.14359/12339
Date:
11/1/2002
Abstract:
Bond slip responses between concrete and reinforcement are known to be highly nonlinear due to the interfacial properties of the two different materials, steel and concrete. A simple expression is derived to predict bond strength of reinforcing bars with rib deformation to the surrounding concrete for the case of splitting bond failure. Finite element analysis is used to model the confining behavior of concrete cover that provides confinement. The roles of the interfacial properties on bond strength are examined. Values of bond strength obtained using the analytical model are in good agreement with bond test results from previous studies. The analytical model provides insight into interfacial bond mechanisms and the effects of the key variables on the bond strength of deformed bars to concrete. Based on the comparison between the analytical results and the test results, realistic ranges of the friction coefficient, cohesion, and the effective rib face angle are proposed.