Contribution to introducing the effect of fibers and fracture properties on Eurocode formula to determine the deflection of steel fiber reinforced concrete beams
Abstract
Concrete is a brittle material with low tensile strength, steel fibers are used to enhance its response. Steel fiber reinforced concrete exhibits improved ductility, rigidity, tensile strength and cracking resistance compared with normal concrete. In the post-cracking stage, the effect of fibers appears by bridging cracks and its role in transfer stress across these cracks. In this paper, a theoretical analysis is conducted on steel fiber reinforced concrete beams to determine the height of compression zone by taking the effect of fibers and fracture properties (residual tensile stress) into account, without the need to conduct any experimental study to know the post cracking behavior of SFRC, and use it to determine the deflections of steel fiber reinforced concrete beams depending on Eurocode formula. And then the results of this study (curves load – midspan deflection) are compared with many published experimental studies which give a good agreement, and enhance the deflections by (9%-25.2%) compared with values determined in accordance with EC2 (without fibers and fracture properties).
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