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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29137


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10002127
Assessing the Seismic Performance of Threaded Rebar Coupler System
Abstract:
Currently there are many use of threaded reinforcing bars in construction fields because those do not need additional screw processing when connecting reinforcing bar by threaded coupler. In this study, reinforced concrete bridge piers using threaded rebar coupler system at the plastic hinge area were tested to evaluate seismic performance. The test results showed that threads of the threaded rebar coupler system could be loosened while under tension-compression cyclic loading because tolerance and rib face angle of a threaded rebar coupler system are greater than that of a conventional ribbed rebar coupler system. As a result, cracks were concentrated just outside of the mechanical coupler and stiffness of reinforced concrete bridge pier decreased. Therefore, it is recommended that connection ratio of mechanical couplers in one section shall be below 50% in order that cracks are not concentrated just outside of the mechanical coupler. Also, reduced stiffness of the specimen should be considered when using the threaded rebar coupler system.
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References:

[1] ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2011, 503 pp.
[2] Korea Concrete Institute, “Code Requirements for Structural Concrete (KCI-2012),” Korea Concrete Institute, Seoul, Korea, 2012, 342 pp. (In Korean)
[3] www.stressteel.com/files/MUL03_27_Documents/772/sas_cat_rp_de_e n_04_2013.pdf
[4] ASTM A706 / A706M-14, “Standard Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement,” ASTM International, West Conshohocken, PA, 2014, 7 pp.
[5] Korea Standards Association, “KS D 0249:2003 - Method of Inspection for Mechanical Splicing Joint of Bars for Concrete Reinforcement,” Korea Standards Association, Seoul, Korea, 2003, 8 pp.
[6] Park, R., “Evaluation of Ductility of Structures and Structural Assemblages from Laboratory Testing,” Bulletin of the New Zealand National Society for Earthquake Engineering, vol. 23, no. 3, 1989, pp. 55–166.

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