Abstract
Experimental tests were carried out to assess the failure model of steel fiber reinforced concrete beams. Experimental research was focused on observing changes in the behavior of the tested elements depending on the amount of shear reinforcement and the fiber. Model two-span beams with a cross-section of 80x180 mm and a length of 2000 mm were tested. The beams had varied stirrup spacing. The following amounts of steel fibres in concrete were used: 78.5 kg/m3 (1.0%) i 118 kg/m3 (1.5%). Concrete beams without fibres were examined at the same time. The beams were loaded in a five-point bending test until they were destroyed. Shear or bending capacity of the element was observed. Fibre reinforced concrete beams were not destroyed rapidly, but they kept their shape consistent under load. Larger number of diagonal cracks with a smaller width were observed in fibre reinforced concrete beams. Failure of concrete beams without fibres was rapid, with a characteristic brittle cracking. Steel fibres revealed the ability to transfer significant shear stress after cracking in comparison to plain concrete.
Highlights
IntroductionThe use of fibers as dispersed reinforcement in concrete is constantly growing
In recent years, the use of fibers as dispersed reinforcement in concrete is constantly growing
The aim of the work was to assess the impact of steel fibers on the shear resistance of a reinforced concrete beam
Summary
The use of fibers as dispersed reinforcement in concrete is constantly growing. The increased interest the use of fibers exhibited by both concrete technologists and structure designers is related to the development of experimental studies confirming the beneficial effect that different types of fibers have on the properties of cement concrete [1, 2, 3] Fibers used as dispersed reinforcement can be made of steel, glass, plastic, basalt, etc. The introduction of this type of reinforcement changes the properties of both fresh concrete mix and hardened concrete. In comparison to ordinary concrete, concrete with steel fibers is characterized by higher bending tensile strength, and often shear strength; paired with increased fatigue and impact resistance
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