전단철근이 없는 철근콘크리트 깊은 보의 스트럿-타이 모델에서 스트럿의 유효강도계수 평가

Abstract

The internal stress state of deep beam can be represented by strut-and-tie models of compression struts between the loading points and the supports. In the modeling, the effective strength factor stands for the magnitude of the strength deterioration of compression strut due to the effect of cracking and softening. The objective of this study is to quantitatively evaluate the effective strength factor of concrete strut in reinforced concrete deep beam without shear reinforcements for various variables. Twenty reinforced concrete deep beams were tested under two-point top loading. Main variables considered in this study are concrete strength(f_ck