Influence of Steel Fibers on Cracking Behavior of Ordinary Reinforced Concrete Structures

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Title: Influence of Steel Fibers on Cracking Behavior of Ordinary Reinforced Concrete Structures

Author(s): L. Vandewalle

Publication: Special Publication

Volume: 193

Issue:

Appears on pages(s): 467-487

Keywords: beam; compressive strength; concretes; crack

Date: 8/1/2000

Abstract:
The cracking behaviour of concrete beams having longitudinal tension reinforcement and various combinations of volume and aspect ratio of hooked end steel fibers was investigated experimentally. Eight full-scale beams have been tested. The section dimensions (200 x 350 mm2), span length (3250 mm), concrete compressive strength and longitudinal tension reinforcement were kept constant for all beams. The beams were tested at a cube compressive strength of about 40 MPa. The mechanical properties of the steel fiber reinforced concrete under tension were determined according to the Belgian standard NBN B15-238. The addition of steel fibers decreases both the crack spacing and the crack width. A greater reduction of the crack width, crack spacing respectively, can be noticed if steel fibers with a higher aspect ratio are used. Besides the experimental program also a theoretical study has been executed : a modification of the RILEM TC162-TDF-model to predict crack width is proposed.