150MPa 초고강도 철근콘크리트 보의 휨거동에 관한 실험적 연구

Abstract

An evaluate on structural behavior of ultra high strength concrete(UHSC) is necessary and important, because that is different from normal strength concrete. And it is important to evaluate on serviceability of RC structure which is used ultra high strength concrete. The reinforced ultra-high-strength-concrete beam subjected to flexural moment behaves more brittleness than the moderate strength concrete beam reinforced with equal reinforcement ratio(ρ/ρb, ρb=balanced steel ratio). In this study, 10 singly reinforced rectangular beam specimens used 150 ㎫ concrete compressive strength were tested to evaluate on flexural behavior. Test results show that when the concrete compressive strength with 150㎫, the maximum reinforcement ratio should be less than 0.625ρb for ductile behavior. And the shape of the compressive stress block is expected to triangle.