DEVELOPMENT SPLICE STRENGTH OF REINFORCING BARS EMBEDDED IN PLAIN ANDFIBER-REINFORCED CONCRETE/

This study concentrates on analytical evaluation of the bond strength mid anchorage characteristics of reinforcing bars embedded in plain an d fiber reinforced concrete. The analysis is based on a numerical solu tion scheme of the bond problem and incorporates an experimentally der ived local band stress-slip relationship applicable to pullout and spl itting-type bond failure. The analysis accurately reproduced bond test results of reinforcing bars embedded inside exterior beam-column conn ections and showed very good agreement with the experimental results u sed by Orangun, Jirsa, and Breen (1975, 1977) to develop their well-kn own expression of development/splice strength. The results of parametr ic evaluation undertaken suggest that development/splice strength desi gn expressions derived from rest 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 r einforcement, the presence of steel fiber reinforce ment was found to increase the ductility of bond failure and improve development/splice strength in comparison with plain unconfined concrete.