초고강도 섬유보강 콘크리트 부재의 휨강도 산정

Abstract

In this study, experiments on ultra-high-strength steel fiber reinforced concrete beams with 2% volume fraction of steel fiber had been conducted. Test was conducted by two point loading with 2,000kN actuator for slender beam specimen. Shear-span to depth ratio was 6 intending the flexural failure. For the flexural design of ultra-high strength fiber reinforced concrete member an empirical equation had been proposed. Improving accuracy of empirical equation, 9 possible stress distributions for concrete section was compared with test results. For the reliability of empirical equation, these models were compared with experiment results conducted with previous researches. As a results of comparative study, the most exact solution was the model that use the real stress distribution of ultra-high strength fiber reinforced concrete. However, more safer prediction was possible using stress block parameters that was proposed by the study results of ultra-high strength concrete and tensile stress distribution that was considered the debonding properties of fiber.