Experimental investigation of steel fiber reinforced concrete box beams under bending |
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Authors: | Fatih Altun Tefaruk Haktanir Kamuran Ari |
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Affiliation: | (1) Faculty of Engineering, Department of Civil Engineering, Erciyes University, 38039 Kayseri, Turkey |
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Abstract: | Reduction of dead weight of a reinforced-concrete (RC) structure without too much concession in its load carrying capacity
has always been an attractive study subject because it engenders (1) a decrease in dimensions of the members, (2) a decrease
in the reinforcement steel, and (3) a decrease in lateral inertia forces during severe earthquakes. In this study, nine RC
beams of outer dimensions of 300 × 300 × 2000 mm, six of which are box beams, designed and produced using a C20 class steel
fiber concrete, (SFRC) with the commonly used steel fiber type of Dramix-RC-80/0.60-BN at a dosage of 30 kg/m3, are tested under bending. The mechanical behaviours of all these nine beams under bending are recorded from the beginning
of the test till the ultimate failure of the tensile reinforcement in a two-point beam-loading setup. The proportions of (1)
loss in ultimate load versus reduction in dead weight and (2) (ultimate experimental load)/(ultimate theoretical load) of
the SFRC box beams are determined for two different box thicknesses. Dimensionless behaviour relationships of all the SFRC
beams are determined, and the experimentally obtained relationship between the ratio of (actual ultimate load)/(theoretical
ultimate load) and the ratio of (wall thickness)/(beam height) for the SFRC box beams is expressed diagrammatically. |
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Keywords: | Steel fiber reinforced box beams behaviour |
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