Influence of Transverse Sectional Pre-crack on Shear Failure Behavior of RC Slender Beams Based on Experimental Loading Test

For the RC members under cyclic loading, flexural cracks commonly propagate in two opposite transverse directions at zone high bending moment and possibly form penetrating through entire cross sections (pre-crack), which is considered as a crucial factor for flexure-shear failure of member. This paper clarified influence imitation pre-crack on shear behavior slender beams by three point test. Shear span depth ratio (a/d=3.14, 4.69) location thickness were set main variables. As important findings, it was revealed that strength relatively small because does not affect formation critical diagonal crack mode tension failure. It also noted 2d (the section 512 mm, twice effective d, far away from loading plate center) leads to reduction with increasing width, maximum 21.4%. Based detailed analysis propagation, may result patterns crack, condition plane vertically intersects lateral splitting part becomes more severe thereby reduces deformation ability.