Title: Effect of Noncontact Lap Splices in Reinforced Concrete Beams

Author(s): Hyeon-Jong Hwang, Fan Yang, and Gao Ma

Publication: Structural Journal

Volume: 119

Issue: 2

Appears on pages(s): 3-15

Keywords: lap splice; moment distribution; noncontact lap splice; reinforced concrete beam; reinforcing bar stress

DOI: 10.14359/51734374

Date: 3/1/2022

Abstract:
Current design codes specify the bar development length empirically based on contact lap splice test results. The bar splice length of noncontact lap splices is not clearly specified due to limited test results. In the present study, the bond performance of noncontact lap splices was investigated. Lap splice tests were performed on 24 beam specimens under uniformly distributed moment or nonuniformly distributed moment with shear force. The test parameters were spacing of spliced bars, reinforcing bar diameter, transverse reinforcement, and moment distribution. The test results showed that the tensile stress of bar splices increased as the spacing of spliced bars increased in the specimens with stirrups. In the specimens under nonuniformly distributed moment with shear force, the bar splices exhibited better bond strength. The test results were compared with the predictions of current design codes.