Title:
Anchorage Strength of Epoxy-Coated Hooked Bars
Author(s):
Bilal S. Hamad, James O. Jirsa, and NatalieI. D'Abreu De Paulo
Publication:
Structural Journal
Volume:
90
Issue:
2
Appears on pages(s):
210-217
Keywords:
anchorage; bond; development; detailing; epoxy resins; hooked reinforcement; Structural Research
DOI:
10.14359/4127
Date:
3/1/1993
Abstract:
The objective of the study was to determine anchorage characteristics of epoxy-coated hooked bars. The 1989 ACI Building Code (ACI 318-89) does not address this subject and there is no information in the literature. Twenty-five specimens simulating beam-column joints in a structure were tested to assess the effect of several variables on relative bond characteristics of uncoated and epoxy-coated hooked bars. Variables included bar size [#7 and #11 (22 and 36 mm)], concrete strength [3, 4, and 8 ksi (21, 28, and 55 MPa)], amount of side concrete cover normal to the plane of the hook 2-7/8 in. (73 mm) in most specimens; 1-7/8 in. (48 mm) in two tests], hook geometry (90- and 180-deg hooks), and amount of transverse reinforcement (column ties) in the beam-column joint. Tests indicated that epoxy-coated hooked bars consistently developed lower anchorage capacities and greater slips than companion uncoated bars. A design modification was recommended for development length of epoxy-coated hooked bars.