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 disadvantages in traditional splicing methods, this study proposes a combo type mechanical splicing method utilizing the screw-ribbed (i.e., thread-deformed) reinforcing bars. The combo-type mechanical splices were evaluated for seismic performance of 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 reinforced concrete (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.
|Journal||ACI Structural Journal|
|Publication status||Published - Sep 2019|