Title:
Compression Lap Splice in Unconfined Concrete of 40 and 60 MPa (5800 and 8700 psi) Compressive Strengths
Author(s):
Sung-Chul Chun, Sung-Ho Lee, and Bohwan Oh
Publication:
Structural Journal
Volume:
107
Issue:
2
Appears on pages(s):
170-178
Keywords:
bond; compression lap splice; end bearing; splice strength; unconfined concrete.
DOI:
10.14359/51663533
Date:
3/1/2010
Abstract:
A compression lap splice may be calculated to be longer than a tension lap splice in high-strength concrete according to current design codes. New criteria for the compression lap splice, including the effects of concrete strength and end bearing, are required. An experimental study was conducted using compressive concrete strengths of 40 and 60 MPa (5800 and 8700 psi) without transverse reinforcement. Test results showed that the splice strength was proportional to vfc' and that the spacing between bars had little effect on the splice strength. The bar stresses developed by bond were nearly identical to those calculated by the ACI Committee 408 equation. Therefore, the strength increase in the compression splices is solely attributed to end bearing. A design equation was derived for compression lap splices without transverse reinforcement through regression analysis.