고장력 철근을 활용한 휨부재의 연성거동에 관한 연구 논문

소개글

2점재하를 실시, 휨강도, 응력 이력곡선, 인장철근 항복시의 처짐량, 파괴시의 처짐량, 균열, 연성지수를 측정하여 변수에 따른 구조적 거동을 분석하였고, 고장력 철근을 적용한 부재는 항복점의 변위가 크게 나타났고, 이러한 특성이 연성지수의 감소를 가져오는 주요 요인으로 밝혀졌다. 그러나 항복이후의 거동은 동일한 강성을 갖는 일반강도철근의 부재와 유사하게 나타났다. 일반적으로 고장력 철근의 적용 시 균형철근비의 감소에 의한 철근비의 증가로 연성거동의 감소효과가 나타나고 있으나, 콘크리트의 강도를 증가시키면 연성의 증대효과를 기대할 수 있다

본문내용

Abstract

This paper presents the appropriateness for using high strength reinforcement according to the use of high strength concrete. Nine flexural tests were conducted on full-scale beam specimens according to the concrete strength, reinforcement strength and reinforcement ratio as main variable. The structural behavior was analyzed due to the flexural strength, stress-strain curve, deflections at yielding and fracture point, crack appearance and ductility factor. The member with high-strength reinforcements showed large deflection at yielding point and this was analyzed as a main cause to decrease the ductility factor. Structural behavior after yielding point, however, showed similarity to behavior of members with normal strength reinforcements of same stiffness. It was found that in the case of using reinforcements of 5500㎏f/㎠ strength, the combination with concrete of 800㎏f/㎠ strength demonstrated the great appropriateness which can increase the flexural capacity without any reduction of maximum reinforcement ratio.

Keyword: high-strength concrete, high strength steel, upper limit of reinforcement ratio, ductility This combination also showed the same ductile behavior with the combination with normal concrete behavior.

참고 자료

Abstract

This paper presents the appropriateness for using high strength reinforcement according to the use of high strength concrete. Nine flexural tests were conducted on full-scale beam specimens according to the concrete strength, reinforcement strength and reinforcement ratio as main variable. The structural behavior was analyzed due to the flexural strength, stress-strain curve, deflections at yielding and fracture point, crack appearance and ductility factor. The member with high-strength reinforcements showed large deflection at yielding point and this was analyzed as a main cause to decrease the ductility factor. Structural behavior after yielding point, however, showed similarity to behavior of members with normal strength reinforcements of same stiffness. It was found that in the case of using reinforcements of 5500㎏f/㎠ strength, the combination with concrete of 800㎏f/㎠ strength demonstrated the great appropriateness which can increase the flexural capacity without any reduction of maximum reinforcement ratio.

Keyword: high-strength concrete, high strength steel, upper limit of reinforcement ratio, ductility This combination also showed the same ductile behavior with the combination with normal concrete behavior.