To improve the shear and flexural capacity of flexural members, the steel and basalt fibers were used in model beams tested under flexure.
Three series of single span free supported model beams were prepared from SFRC (steel fiber reinforced concrete) with longitudinal steel reinforcement (steel ratio of 1.2 %) and varied spacing of steel stirrups and they were tested till failure.
Another three series of BFRC (basalt fiber reinforced concrete) double-span model beams with a span of 2 mm × 1,000 mm and cross section 180 mm × 80 mm were tested. During the tests till to the failure the beam reactions, vertical deflections and horizontal strains in concrete were registered, to clarify the range of redistribution of bending moments and shear forces over the span of the beams.
Almost all the tested model beams failed in shear, showing visible influence of steel and basalt fibers on the shear capacity of the tested beams. The tests results confirmed that steel and basalt fibers in reinforced concrete beams can partially replace (in certain cases) the traditional steel stirrups calculated for shear.
Julita Krassowska and Andrzej Lapko
Faculty of Civil Engineering, Bialystok University of Technology, Poland