Modeling Bond Behavior of Lap-Spliced Enamel-Coated Rebar


Bond behavior of coated rebar spliced in concrete has gained significant attention due to the modified interfacial behavior between the coated surface and cementitious materials. This paper proposes an analytical model to describe the bond behavior of enamel-coated rebar spliced in concrete beams. This model considers the strain-softening behavior of concrete in the stress transfer mechanism between spliced rebar and concrete. The local bond strength caused by rebar characteristics and the effect of enamel coating was considered through the unified local bond model. The coupled stress bursting pressure generated by the splice was analyzed using equivalent stress analysis. The proposed model was validated by comparison with the experimental results of 24 concrete beams reinforced with both uncoated and coated rebar. The proposed theoretical analysis and model provide an efficient analytical approach of translating local bond behavior of coated reinforcement to the global bond behavior of lap splices in RC beams. The results indicated a significant coating effect on the load-strain responses of lap splices under tension forces.


Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Center for Research in Energy and Environment (CREE)

Second Research Center/Lab

Center for High Performance Computing Research


Financial support for this study was provided in part by the National Science Foundation under Award No. CMMI-0900159 and by the Department of Civil, Architectural, and Environmental Engineering at Missouri University of Science and Technology.

Keywords and Phrases

Analytical model; Bond strength; Coating effect; Enamel coated rebar; Splice

International Standard Serial Number (ISSN)

0899-1561; 1943-5533

Document Type

Article - Journal

Document Version


File Type





© 2019 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Sep 2019