Bent Bars in High-Strength Concrete

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Title: Bent Bars in High-Strength Concrete

Author(s): Kaare K. B. Dahl

Publication: Special Publication

Volume: 121

Issue:

Appears on pages(s): 767-780

Keywords: bending (reinforcing steels); bent-up bars; compressive strength; cover; high-strength concretes; loads (forces); reinforced concrete; stresses; tests; Structural Research

Date: 11/1/1990

Abstract:
Presents the results of an investigation undertaken at the Technical University of Denmark to determine the parameters that affect the ultimate load capacity of a concrete structure subjected to concentrated loads originating from reinforcement bars bent 90 deg. The following parameters have been found to have a decisive influence on the ultimate load capacity of the concrete bar: bar diameter, internal height of the specimen, side concrete cover, and concrete compressive strength. The results show that the relative load-carrying capacity of the concrete åc / fc decreases for increasing concrete compressive strength. However, the use of high-strength concrete (HSC) still results in an increase in the absolute load-carrying capacity of the concrete whencompared to normal strength concrete (NSC).