Title:
Reinforced Concrete Compression Lap Splices Under Inelastic Cyclic Loading
Author(s):
Nader Panashahi, Richard N. White, and Peter Gergely
Publication:
Structural Journal
Volume:
89
Issue:
2
Appears on pages(s):
164-175
Keywords:
beams (supports); bond (concrete to reinforcement); columns (supports); cyclic loads; ductility; earthquake resistant structures; lap connections; reinforced concrete; reinforcing steels; splicing; Structural Research
DOI:
10.14359/2939
Date:
3/1/1992
Abstract:
The behavior of compression lap splices in reinforced concrete members subjected to high-level repeated cyclic loads is described. The results from seven full-scale test specimens are presented. The main factors studied were the diameter and yield strength of the main (spliced) bars, the splice length and spacing, and the amount of transverse reinforcement. A one-dimensional nonlinear finite element model was used to analyze compression lap splices in axially loaded columns. This method included the effects of end bearing and bond strength deterioration, and bond-slip stiffness degradation under high-intensity cyclic loading. Results are presented from a parametric study of the following variables: end-bearing capacity, initial stiffness of bond-slip curve, ultimate bond strength, ratio of steel to concrete area, and load history (monotonic versus repeated loads. This research indicates that compression lap splices can be designed to sustain a minimum of a dozen cycles of high-intensity loads (axial or flexural) into the inelastic range, where the maximum bar strain reaches at least three times the yield strain. Tentative recommendations are proposed for the design of compression lap splices under seismic loading.