Study of Bond Stress-Slip Relationships in Reinforced Concrete


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Title: Study of Bond Stress-Slip Relationships in Reinforced Concrete

Author(s): Saeed M. Mirza and Jules Houde

Publication: Journal Proceedings

Volume: 76

Issue: 1

Appears on pages(s): 19-46

Keywords: bond (concrete to reinforcement); bond stress; calibrating; compressive strength; cover; cracking (fracturing); crack propagation; crack width and spacing; deformations (reinforcing steels); deformed reinforcement; finite element method.

Date: 1/1/1979

This paper reports the results of tests on 62 concentric tension specimens (38 reinforced with #8 bars, 12 with #6 bars and 12 with #4 bars). Thirteen of these tests were conducted on specimens reinforced with special internally instrumented #8 bars to obtain the tensile force distribution along the specimen. Record of end slips, elongation of the embedded bar, and crack formation and propagation was made in all cases. A bond stress-slip relationship is derived from the experimental data and it accounts for the following parameters: load level, thickness of the concrete cover, and the concrete strength. This constitutive relationship can be used to calculate the stiffness of the discrete pullout springs connecting the steel and the concrete nodes in a finite element formulation of a reinforced concrete member.