Assessing Historical Provisions for Bond of Plain Bars

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Title: Assessing Historical Provisions for Bond of Plain Bars

Author(s): Lisa R. Feldman and John Cairns

Publication: Structural Journal

Volume: 114

Issue: 2

Appears on pages(s): 463-472

Keywords: bar shape; beam-end specimen; casting position; historical code provisions; lap splice; plain reinforcement; structural evaluation; structural safety

Date: 3/1/2017

Abstract:
ACI 562-13 permits development and lap splice lengths of historical reinforcing bar types to be assessed using code provisions that were in effect at the time of construction. A comparison of lap splice lengths for plain bars as predicted using provisions included in historical ACI code editions was therefore made to test results from 25 lap splice specimens and 220 beam-end specimens reinforced with round or square bars cast in the top or bottom position. A factor of safety of 2 was assumed for provisions based on a working stress design (WSD) approach. Provisions in all code editions reviewed do not appear to provide adequate safety for bars cast in the top position, while most appear reasonable for round bars cast in the bottom position. The analysis is also discussed in the context of possible construction scenarios that may be encountered when evaluating or rehabilitating existing reinforced concrete structures.