Abstract
The good performance of reinforced concrete structures is ensured by the transfer of stress linking a reinforcing bar and the surrounding concrete. The bond steel-concrete is a very complex phenomenon. This paper presents the experimental results of a program with specimens used in the pull out test with concrete strength of 20, 40, 60, 80 and 100 MPa and four different steel diameters: 12.5, 16.0, 20.0 and 25.0 mm. The test results indicated that the bond stress varied with the bars rib face angle, rib spacing, and rib height. The trends of the results were independent of the concrete strength with the test results, and design recommendations made as regards optimum rib geometries of deformed bars with high bond-slip characteristics.
Highlights
The behavior of the bond between the steel reinforcement and the concrete enveloping the bar is of fundamental importance in relation to the load capacity of the structural concrete
This paper presents the results of pull out tests of different concrete strengths: 20, 40, 60, 80 and 100 MPa and four different steel diameters: 12.5, 16.0, 20.0 and 25.0 mm and design recommendations were made concerning optimum rib geometries of deformed bars with high bond-slip characteristics
This method enables calculation, according to RILEM (CEB (1983)), of the values of the medium and maximum bond stress for each bar diameter used in the different strength concretes, so as to compare them with the values of given standards, as well as to trace curves representing the characteristics of bond stress x slipping
Summary
The behavior of the bond between the steel reinforcement and the concrete enveloping the bar is of fundamental importance in relation to the load capacity of the structural concrete. Knowledge of this is imperative to ascertaining anchorage lengths, the lap splices, tension stiffening between cracks and other important factors for the structures[1,2,3,9]. The concrete strength is the main parameter that influences the anchorage length and the transmission of tensions concentrated on the bars ribs. Other factors that influence the bond stress are the roughness and/or irregularities on the bar surface; the diameter of the bars; type and positioning of the ribs
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