NDLI: Bond over direct support of deformed rebars in normal and high strength concrete with and without fibers

Content Provider	Springer Nature Link
Author	Dancygier, Avraham N. Katz, Amn
Copyright Year	2011
Abstract	This paper describes results of the second stage of a research on the bonding of deformed bars in normal and high strength concrete with and without fibers. The current study focused on the effect of confinement conditions, which are present over a direct support of a reinforced concrete beam, and compares these results with data obtained in the first stage of the research. The experimental work consisted of pullout tests, which were based on the standard RILEM flexural bond test (“beam test”) of deformed steel bars with diameters of 12 and 20 mm. Results revealed an increase in the normalized bond strength due to support conditions. An unstable post-peak slip of the tested rebar was observed when located over the support, whereas bars bonded near mid-span exhibited controlled bond–slip throughout the test. Up to peak load, however, bond–slip relations exhibited higher energy absorption over the support than near mid-span. Inclusion of fibers had only a minor effect on bond strength but had a significant influence on pre-peak energy absorption. A previously developed model of bond strength shows good agreement with current results when applying an increase factor due to the support effect.
Starting Page	265
Ending Page	275
Page Count	11
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	45
Issue Number	1-2
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-08-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bond Support conditions Deformed rebars High strength concrete Steel fibers Confinement Operating Procedures, Materials Treatment Structural Mechanics Civil Engineering Materials Science Building Materials Theoretical and Applied Mechanics
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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