DefinePK

Abstract

The flexural behavior of eleven 150×150×1950 mm ultra high performance conventionally reinforced concrete beams containing hooked and crimped steel fibers with different volume fractions (0.5 %, 0.75 % and 1 %) in full and partial depths of beams cross sections is studied in this investigation. The load deflection relationship, resilience, toughness indices, first crack load, ultimate load and concrete strains were investigated. The experimental results show that the addition of steel fibers slightly enhances the load-deflection relationship and ultimate load for beam specimens. The type of steel fibers (crimped and hooked) has a little effect on load-deflection behavior, ultimate moment capacity, cracking pattern, while in resilience and toughness, beam specimens with hooked steel fiber showed slightly better behavior than those with crimped steel fibers. The ultimate tensile strength of beams has been rederived and contributed in order to calculate the moment capacity. The calculated ultimate moment capacity was in good agreement with the experimental ultimate moment capacity.