Seismic Performance of Reinforced Concrete Column- Foundation Connections Using Combo-Type Mechanical Splices

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Title: Seismic Performance of Reinforced Concrete Column- Foundation Connections Using Combo-Type Mechanical Splices

Author(s): Deuckhang Lee, Thomas H.-K. Kang, Hyunjin Ju, Sung-Woo Moon, and Il-Seung Yang

Publication: Structural Journal

Volume: 116

Issue: 5

Appears on pages(s): 173-186

Keywords: column-foundation connections; reinforced concrete; seismic; splices

Date: 9/1/2019

Abstract:
Commercially available reinforcing bars are generally produced in standard lengths to ensure smooth shipment and quality control in steel manufacturing plants. As a result, splicing of reinforcing steel bars is inevitable in construction of reinforced concrete structures. To improve constructability and lessen disadvantages in traditional splicing methods, this study proposes a combo-type mechanical splicing method using the screw-ribbed (that is, thread-deformed) reinforcing bars. The combo-type mechanical splices were evaluated for seismic performance of reinforced concrete (RC) column-foundation connections under cyclic loading tests. In the test program, presence of grout in the mechanical sleeves, location of splices, and compressive strengths of concrete were considered as the key variables. Test results demonstrated that RC column-foundation connections with mechanical splices can provide comparable seismic performance with that of continuous reinforcement. In addition, results confirmed current building code allowance for non-grouted mechanical splices in RC intermediate moment frames.