Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal

Abstract

Reinforced concrete (RC) slabs are characterised by reduced construction time, versatility, and easier space partitioning. Their structural behaviour is not straightforward and, specifically, punching shear strength is a current research topic.In this study an experimental database of 113 RC slabs without shear reinforcement under punching loads was compiled using data available in the literature. A sensitivity analysis of the parameters involved in the punching shear strength assessment was conducted, which highlighted the importance of the flexural reinforcement that are not typically considered for punching shear strength.After a discussion of the current international standards, a new proposed model for punching shear strength and rotation of RC slabs without shear reinforcement was discussed. It was based on a simplified load-rotation curve and new failure criteria that takes into account the flexural reinforcement effects.This experimental database was used to validate the approaches of the current international standards as well as the new proposed model. The latter proved to be a potentially useful design tool.

A Modified Compression Field Theory Based Analytical Model of RC Slab-Column Joint without Punching Shear Reinforcement

“…Moreover, 75% of the specimens exhibit the slenderness ratio h/B = 0.07-0.10. This value conforms to international standards and ensures that the slab's flexural behavior is acceptable [27]. In order to study the effects of size effect, another 25% of the specimens which the slenderness ratio h/B are more than 0.10 or less than 0.07 are also collected in the database.…”

FRP Strengthening of RC Structures: Sustainable, Environmental and Structural Evaluations

“…The punching shear strength design equation provided in TS500 [38] is moderately similar to the code provisions of ACI 318 [46]. The main drawback of TS500 [38] is the disregard of the effect of the reinforcement ratio in predicting the punching shear strength of slab-column connections, even though it is one of the most influential parameters affecting the punching shear capacity of such connections [47][48][49]. Additionally, the size effect is not included in the code equations in relation to the punching shear strength despite its strong impact on the punching shear capacity of such connections [50].…”