Title: Bond of Deformed Bars to Concrete: Effects of Confinement and Strength of Concrete

Author(s): Parviz Soroushian, Ki-Bong Choi, Gill-Hyun Park, and Farhang Aslani

Publication: Materials Journal

Volume: 88

Issue: 3

Appears on pages(s): 227-232

Keywords: bond (concrete to reinforcement); compressive strength; confined concrete; deformed reinforcement; joints (junctions); models; reinforcing steels; slippage; stress-strain relationships; tests; Materials Research

DOI: 10.14359/1818

Date: 5/1/1991

Abstract:
Slippage of the beam reinforcement at beam-column connections is an important cause of damage to reinforced concrete frames under static and dynamic loads. Paper summarizes the results of an experimental study on the effects of confinement and compressive strength of concrete on the local bond stress-slip characteristics of deformed bars. The test data indicate that, as far as the bond-splitting cracks are restrained by reinforcing bars crossing these cracks, confinement of concrete has insignificant effects on the local bond behavior. The ultimate bond strength, however, increases proportionally with the square root of concrete compressive strength. An empirical model was developed for the local bond stress-slip relationship of deformed bars in confined concrete.