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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 20 Abstracts search results
Document:
SP81-01
Date:
November 1, 1984
Author(s):
Roop L. Jindal
Publication:
Symposium Papers
Volume:
81
Abstract:
Tests were made on 44 beams to study the effect of steel fibers as shear reinforcement and to determine if there was any increase in the shear/moment capacity and change in the mode of failure. Span length of 30 in. (762 mm) was used for shear-span ratios (a/d) of 2.0 and 2.4, and 60 in. (1524 mm) for a/d ratios of 3.6 and 4.8. Steel fibers of 1% by volume were used in all SFRC beams. The variables were type of fibers, aspect ratio (l/d) of the fibers and the shear span ratios. Test results showed that shear and moment capacities of SFRC beams varied from 1.50 to 1.92 and 1.12 to 1.39 times, that of conventional reinforced concrete beam, respectively. Pbde of failure changed from shear mode to moment mode when SFRC was used. Steel fibers having aspect ratio of 75 or thin fibers were found to be most effective for increasing the shear capacity of SFRC beams. A design method has been suggested for analysing and designing SFRC beams. Theoretical results based on this method compare favorably with the test results.
DOI:
10.14359/6443
SP81-02
R. John Craig, S. Dunya, J. Riaz, and H. Shirazi
The objective of this study was to examine the torsional behavior of reinforced fibrous concrete beams under pure torsion, and to develop a theoretical approach to analyze these beams. The addition of steel fibers to the concrete mix has been receiving more attention as a way of improving the properties of the concrete. This study has two objectives: 1) to observe the behavior of fibrous reinforced concrete in torsion, and 2) to present a realistic method for analysis of fibrous reinforced concrete in torsion. Nine beams were analyzed and experimentally tested. There were two beams with no fibers, seven of them with different percentages of fibers by volume (two different types). All beams had the same longitudinal bars but the hoop spacing was varied.
10.14359/6444
SP81-03
Gordon Batson, Terry Terry, and Ming-Sung Chang
Test data using steel fibers as torsional shear reinforcement for 36 reinforced concrete beams subjected to combined bending and torsion are presented. Beams were loaded in bending at third points and by third point torsional loading. Straight steel fibers were 1.0 in (25.4 mm) long by 0.010 x 0.022 in (2.5 x 5.0 mm) in cross section and the volume percentages of fibers were 0.0, 0.5 and 1.0 and 1.5 percent. Test data were compared to a theory developed by Martin for concrete beams subjected to bending and torsion reinforced with longitudinal steel only, no closed stirrups. One volume percent or greater of straight steel fibers in combination with longitudinal torsional reinforcement were effective as torsional reinforcement for M/T ratios less than two. For M/T ratios greater than 10, 0.5 volume per cent was sufficient for torsional rein-forcement.
10.14359/6445
SP81-04
R. John Craig, J. McConnell, H. Germann, N. Dib, and F. Kashani
The behavior of reinforced fibrous concrete columns was observed with a testing program of 36 columns. The theory was analyzed with the help of interaction diagram load-moment, which was developed for this investigation. Previous investigation results, equations, were modified to reflect the presence of fibers in the reinforced concrete columns. Fifteen columns with modeled dimensions of 6 by 4.75 inches were tested in pure axial compression with steel fiber contents of 0%, .75%, and 1.5% by volume with tie spacings ranging from 3 to 9 inches. Twenty-one columns were analyzed and experimentally tested to examine the shear behavior of axially loaded fibrous reinforced concrete short columns under double curvature bending.
10.14359/6446
SP81-05
Roop L. Jindal and Kamal A. Hassan
Six two span continuous type beam-column specimens of span 1.75 m (5 ft.06.9 in.) each were tested to failure. The specimens had beam section of 150 x 250 m m (6 x 10 in.) and column section of 150 x 150 mm (6 x 6 in.). The beam section had 2 bars each of 12 mm (l/2 in.) diameter. two test specimens (Type A) were of reinforced concrete, having steel stirrups as shear reinforcement. In other two specimens (Type B) steel fiber reinforced concrete (SFRC), having steel fibers of size 25 x 0.25 mm (1.0 x 0.01 in.), 2% by weight of concrete was used throughout the specimens. In the remaining two specimens (Type C) SFRC was provided in the connection region only. An axial compressive load of 18000 kgf (40 kips) was applied to the column section by post tensioning high strength steel. Vertical load was applied to each of the beams at a distance of 1.175 m (46.26 in.) fran each end. Test results showed an increase of 19% and 9.9% in shear and moment capacities respectively of SFRC connections over that of RCC connections. SFRC connections failed in ductile mode of failure. SFRC was found to be very effective in the connection region in specimens tested for low cycle fatigue.
10.14359/6447
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