Monotonic and cyclic performance of threaded reinforcement splices

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Title: Monotonic and cyclic performance of threaded reinforcement splices
Authors: Bompa, DV
Elghazouli, AY
Item Type: Journal Article
Abstract: This paper examines the fundamental uniaxial monotonic and cyclic response of reinforcement bars connected with threaded mechanical couplers. Based on a survey of available splicing forms, two types of threaded couplers with different geometric configurations, namely ‘parallel threaded couplers’ and ‘parallel threaded sleeve couplers’ are selected for detailed assessment. An experimental study consisting of twenty-four bare (in-air) and embedded (in-concrete) specimens incorporating threaded couplers and non-spliced counterparts, is described. The results enable direct assessment of strength as well as complete deformation characteristics, including the post-cracking and post-yield response, for both monotonic and cyclic conditions. After describing the material properties and specimen details, the main observations are reported based on detailed measurements of crack kinematics including crack width and spacing through a digital image correlation system. Complementary numerical studies, undertaken using nonlinear finite element procedures which are validated against the tests, enabled supplementary parametric investigations accounting for wider ranges of coupler geometries. The findings show that existing guidelines may be used for assessing the crack width and spacing, by accounting for the characteristic bond behaviour at the rebar and coupler regions. The complete deformational response may be obtained by using a suggested stiffness reduction factor that depends on the coupler geometry. Several ‘in-air’ performance parameters may also be used as a basis for the selection and implementation of couplers in applications requiring ductile member behaviour.
Issue Date: 13-Nov-2018
Date of Acceptance: 10-Nov-2018
ISSN: 2352-0124
Publisher: Elsevier BV
Start Page: 358
End Page: 372
Journal / Book Title: Structures
Volume: 16
Copyright Statement: © 2018 Institution of Structural Engineers. Published by Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence
Keywords: Science & Technology
Engineering, Civil
Cyclic response
Inelastic behaviour
Concrete members
Reinforcement splices
Threaded mechanical couplers
Publication Status: Published
Embargo Date: 2019-11-13
Online Publication Date: 2018-11-13
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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