Development/splice strength of reinforcing bars embedded in plain and fiber reinforced concrete

Abstract

This study concentrates on analytical evaluation of the bond strength and anchorage characteristics of reinforcing bars embedded in plain and fiber reinforced concrete. The analysis is based on a numerical solution scheme of the bond problem and incorporates an experimentally derived local bond stress-slip relationship applicable to pullout and splitting-type bond failure. The analysis accurately reproduced bond test results of reinforcing bars embedded inside exterior beam-column connections and showed very good agreement with the experimental results used by Orangun, Jirsa, and Breen (1975, 1977) to develop their well-known expression of development/splice strength. The results of parametric evaluation undertaken suggest that development/splice strength design expressions derived from test data in which the steel stresses were below yield at bond failure are unsafe when extended linearly to the post-yield range of reinforcing bars. Similar to ordinary transverse reinforcement, the presence of steel fiber reinforcement was found to increase the ductility of bond failure and improve development/splice strength in comparison with plain unconfined concrete.