Compression splices in confined concrete of 40 and 60 MPa (5800 and 8700 psi) compressive strengths
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Media Type: Article/Story
Article Source: ACI STRUCTURAL JOURNAL Vol 107, no 4 pp. 476 - 485
Series:
Author: CHUN, S.-C., LEE, S. H., OH, B.
Call Number:
Accession Number: 201007476
Publisher: , Farmington Hills, MI, United States Publication Date: May - June 2010
Subject:STRUCTURAL ANALYSIS; REINFORCED CONCRETE; UNITED STATES
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. An experimental study was conducted on compressive lap splices using concrete compressive strengths of 40 and 60 MPa (5800 and 8700 psi), and the effects of transverse reinforcement were assessed. Test results showed that the end bearing was improved by the provision of transverse reinforcement exclusively at the ends of the splice and that the bond increased proportionally to the amount of transverse reinforcement, up to a transverse reinforcement index (Ktr/db = 40Atr /(strdbn)) of 1.76. The bar stresses developed by the bond were nearly identical to those calculated by the equation of Orangun et al.; therefore, the strength increase in the compression splices was attributed solely to the end bearing. A design equation was derived for compression lap splices with transverse reinforcement through regression analysis. In addition, a simplified equation for design was suggested. Keywords: bond; compression lap splice; end bearing; splice strength
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