Title:
Strength of Epoxy-Coated Reinforcing Bar Splices Confined With Transverse reinforcement
Author(s):
B. S. Hamad and J. O Jirsa
Publication:
Structural Journal
Volume:
90
Issue:
1
Appears on pages(s):
77-88
Keywords:
anchorage (structural); bonding; detailing; epoxy resins; lap connections; reinforcing materials; splicing; Design
DOI:
10.14359/4215
Date:
1/1/1993
Abstract:
Determines the effect of epoxy-coated transverse reinforcement on the strength of epoxy-coated bar splices. Existing recommendations for design of splices and anchorage of epoxy-coated reinforcement were reviewed, and modifications were suggested. Twelve beams were tested in negative bending with multiple splices in a constant moment region at the center of the beam. All bars were cast in a top bar position with more than 12 in. (30 cm) of concrete below the bars. Companion specimens were identical except for the bar coating. The prime variable was the amount of transverse reinforcement crossing the splitting plane in the splice region. Other variables included bar size {No. 6 (19 mm) and No. 11 (36 mm)} and bar spacing. The nominal coating thickness of all epoxy-coated bars was 8 mils (0.2 mm). Failure of all beams was coverned by splitting of the concrete cover in the splice region. Test results indicated that the presence of transverse reinforcement in the splice region increased deformation capacity of the beams and improved anchorage strength of epoxy- coated bar splices relative to uncoated bar splices. The improvement was independent of the number of splices, bar size, or bar spacing. Using results of this study and results of other tests on epoxy-coated bar splices in the literature, a comprehensive review of the effect of epoxy coating on structural aspects of epoxy-coated bar splices was performed. Design equations were recommended, and modifications to the ACI Building Code (ACI 318-89) development and splice length provisions were suggested.