| Title |
An Evaluation of Effective Strength Factor of Strut in Strut-Tie Modeling of Reinforced Concrete Deep Beams without Shear Reinforcement |
| Authors |
Yang Keun-Hyeok ; Lee Young-Ho ; Eun Hee-Chang ; Chung Heon-Soo |
| Keywords |
deep beam ; strut-and-tie model ; effective strength factor ; shear span-to-overall depth ratio ; size effect |
| 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() in the range of 31～78 MPa, shear span-to-overall depth ratio(a/h) in the range of 0.5～1.5, and section depth(h) in the range of 400～1,000mm. It was observed that a/h and h should be deeply related to the effective strength. Based on the experimental investigation, this study proposed experimental equations to predict the ultimate strength of reinforced concrete deep beam including size effects in the model. |