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Effect of Steel Fibers on the Cracking Behavior of Reinforced Concrete Continuous Beams

by M. N. Hassoun, South Dakota State Univ, Civil, Engineering Dep, Brookings, SD, USA,
K. Sahebjam, South Dakota State Univ, Civil, Engineering Dep, Brookings, SD, USA,



Document Type: Proceeding Paper

Part of: Structural Design, Cementitious Products, and Case Histories

Abstract:

A research program was conducted with the aim of studying the cracking behavior of reinforced concrete continuous beams, as it is affected by using different combinations of main steel reinforcement and steel fibers. For this purpose, nine two-span continuous beams were cast and tested under increasing load up to failure. The beams contained different main reinforcement that varied between 0. 67 percent and 1. 9 percent while that of steel fibers varied between 0. 0 percent and 1. 2 percent. From test results, it was found that fibrous concrete beams had a better distribution of cracks than concrete without fibers. The maximum crack spacing was 5 in. and 8 in. for fibrous and non-fibrous concrete beams respectively. An equation is introduced to evaluate the crack width of reinforced concrete beams containing steel fibers.

Subject Headings: Concrete beams | Continuous beams | Fiber reinforced concrete | Fibers | Cracking | Steel fibers | Steel beams

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