Title:
Experimental Study on Lap Splice Behavior under Nonlinear Wind Loading Protocols (Prepublished)
Author(s):
Samuel D. Halim, Mehmet E. Unal, Eric R. Ahlberg, and John W. Wallace
Publication:
Structural Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
lap splice; performance-based wind design; shear wall; structural wall
DOI:
10.14359/51751902
Date:
8/7/2026
Abstract:
Performance-based wind design (PBWD) permits limited inelastic component behavior in reinforced concrete (RC) structural walls; however, the adequacy of ACI CODE-318-25, Chapter 11 detailing, specifically for lap splices at critical sections, remains unstudied under wind loading protocols (WLPs). This shortcoming was addressed using test data from thirteen RC beams and six RC walls. Test parameters included splice length, longitudinal bar diameter, amount of transverse reinforcement, compressive strain levels, and retrofitting with CFRP. Specimens detailed with ACI CODE-318-25 Chapter 11 provisions performed poorly, losing strength prior to completing the WLP. Based on test data, the parameter aspψdb is proposed that relates the clamping force from transverse reinforcement and CFRP confinement to the yield force of the spliced bars asp, scaled by a bar diameter factor ψdb, to the measured average splice strain ductility, με. A minimum aspψdb value of 2.30 is proposed to prevent splice failure under prescribed WLPs.