Development/Splice Length of Reinforcing Bars

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Title: Development/Splice Length of Reinforcing Bars

Author(s): M. Reza Esfahani and M. Reza Kianoush

Publication: Structural Journal

Volume: 102

Issue: 1

Appears on pages(s): 22-30

Keywords: bond; concrete; development length; reinforcement; rib; splice; transverse reinforcement

Date: 1/1/2005

Abstract:
This paper presents an equation to calculate the required development/splice length of reinforcing bars. The equation is based on previous studies on bond between normal-strength concrete (NSC) and high-strength concrete (HSC) and reinforcing bars. The previous proposed equation to predict the bond strength has been modified to account for the effect of rib properties of reinforcing bars. Also, a new parameter to account for the effect of transverse reinforcement (TR) on bond strength has been introduced. The comparison between the results of 284 available tests in cases of NSC and HSC shows that the new proposed model correlates very well with the test results. Using the proposed equation for bond strength, an equation to calculate the development/splice length has been derived. The equation requires providing some amounts of TR along the development/splice length. By providing the calculated value of TR, the proposed development/splice length would result in adequate ductility for beams with spliced bars. The proposed procedure correlates well with the test results.