Fracture Analysis of Bar Pull-Out in Beam-Column Joints

D. Jankovic (Civil Engineering and Geosciences Department Delft University of Technology, Delft, The Netherlands) S.K. Kunnath (Department of Civil and Environmental Engineering, University of California at Davis, Davis, USA) M.B. Chopra (Department of Civil and Environmental Engineering, University of Central Florida, Orlando, USA)

In order to predict the bond-slip behavior of reinforcing bars in a typical interior beam-column joint of a reinforced concrete frame structure, experiments and numerical analyses were conducted. A concrete cylinder with a centrally embedded deformed rebar served to represent the pull-out condition. The bar was subjected to a monotonic tensile axial load at the free end while the other end was embedded in concrete. One of the primary variables was the content of propylene fibers in the concrete since one of the objectives of the study was to investigate the bond characteristics of polypropylene fiber concrete. The resulting bond-slip mechanism was studied as an axisymmetric 2D problem using the Finite Element Analysis software, DIANA. Input data for the numerical analysis were derived from the experiments. The influence of the variations in the bar embedment length as well as the addition of different percentage of polypropylene fibers in fiber rein-forced concrete on bond-slip, bond stress, deformation and cracking patterns were examined. The results from the numerical analysis are presented.

Share this article!

Request a publication

Share this article!