FraMCoS 7 2010 Jeju, South Korea

Role of diagonal tension crack in size effect of shear strength of deep beams

To clarify the effect of cracking propagation behavior especially on the size effect of deep reinforced concrete beams, 17 deep beams were tested in this study. Experimental factors are specimen size, depth, shear span to effective height ratio (a/d) and…

First page of: Role of diagonal tension crack in size effect of shear strength of deep beams
Year 2010
File Size 1.9 MB
Download PDF (1.9 MB)

Abstract

To clarify the effect of cracking propagation behavior especially on the size effect of deep reinforced concrete beams, 17 deep beams were tested in this study. Experimental factors are specimen size, depth, shear span to effective height ratio (a/d) and bonding of longitudinal bars. 6 beams were un-bonded not to induce diagonal tension crack. As a result, these un-bonded beams had small size effect regardless of a/d while bonded beams showed relatively strong size effect in case of 1.5 of a/d. Because the cracking pattern of diagonal crack influences on the strength of com- pressive concrete strut, we developed simplified truss model which can deal with the effect of diagonal cracking path on the strength of deep beams and short beams. Proposed model is verified with past researches. As a result, it is clalified that proposed model tends to overestimate the shear strength when bearing failure occurs.