Detailing of Steel Fiber-Reinforced Concrete Opening Corners

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Title: Detailing of Steel Fiber-Reinforced Concrete Opening Corners

Author(s): Bhupinder Singh and Surendra Kumar Kaushik

Publication: Structural Journal

Volume: 99

Issue: 5

Appears on pages(s): 614-621

Keywords: fiber-reinforced concrete; joint; steel

DOI: 10.14359/12301

Date: 9/1/2002

Abstract:
The influence of detailing on the behavior of steel fiber-reinforced concrete (SFRC) opening corners is reported. A mixed, rather than one, aspect ratio of crimped-type steel fibers was used in the concrete. The variables investigated were percentage of tension steel and amount of diagonal steel in the corner. The results obtained indicate that, unlike in plain concrete corners, maximum steel content of up to 1% can be incorporated in SFRC opening corners without compromising the joint efficiency. The inclusion of diagonal steel stiffens the joint and substantially increases its efficiency. The addition of steel fibers in the matrix modifies the bond characteristics of the reinforcing bars, and a higher diagonal steel content could be effectively used in the corner—so much so that failure took place due to formation of a hinge in one of the members framing into the corner rather than a diagonal tension failure at the corner itself, as obtained in nonfiber concrete opening corners. On the basis of the results of this and another investigation on SFRC opening corners, it can be concluded that diagonal steel contents in excess of the hitherto recommended 50% of the main steel percentage, can be efficiently used in opening corners.


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