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Evaluation of load transfer and strut strength of deep beams with short longitudinal bar anchorages

TitleEvaluation of load transfer and strut strength of deep beams with short longitudinal bar anchorages
Publication TypeJournal Article
Year of Publication2009
AuthorsBreña SF, Roy NC
JournalInternational Concrete Abstracts Portal
Volume106
Issue5
Start Page491
Pagination491-493
Date Published09/2009
Keywordsanchorage length, deep beams, Strength, strut-and-tie models
Abstract

This paper presents laboratory results of 12 deep beams in which the longitudinal reinforcement was anchored into the support using short straight bar anchorages. The shortest anchorage lengths provided were below 50% of those required by ACI 318-08 Chapter 12 provisions. Four different specimen groups were constructed using three different shear span-depth ratios (a/d) and two longitudinal bar sizes. Most of the beams failed by strut crushing after yielding of the main longitudinal reinforcement at midspan. Only those specimens with the shortest anchorage length in each group developed concrete splitting failures along the anchorage region. The effect of a/d and anchorage length on strut strength and load transfer mechanism observed in the tests is presented and discussed. Test results indicate that a significant portion of the applied shear force may be transferred through truss action even in beams with low a/d. In addition to well-known variables such as a/d and transverse reinforcement content, short anchorage length affected the load transfer characteristics of the deep beams tested in this research.