Analysis of the shear strength mechanism of slender precast concrete beams with cast-in-place slab and web reinforcement

Towards the Development of a Formulation for Obtaining the Shear Strength of Concrete Composite Beams

“…With the aim of studying the different aspects related to the shear strength of concrete composite beams mentioned above, the authors developed an extensive experimental programme on concrete composite elements, which was partially published in [22][23][24][25]. The scope of this research covered specimens that showed a structural failure influenced by the existence of an interface between concretes, leaving out those with pure horizontal shear failure and monolithic behaviour, which have already been studied in multiple publications.…”

“…In [23], the authors analysed the results of 21 monolithic and composite, rectangular and T-shaped beams without web reinforcement and analysed in depth their shear strength mechanisms. In [24],…”

“…The same procedure was followed in [25], where the results of 19 monolithic and composite T-shaped specimens were analysed in shear. In the last two publications [24,25], a mechanical model was proposed based on the experimental results…”

“…The objective of this paper is to present in one single document the whole research carried out at the Concrete Science and Technology University Institute (ICITECH) of the Universitat Politècnica de València (UPV; Spain) for studying the shear strength of concrete composite beams. To that aim, the results of the 69 slender reinforced concrete beams tested in shear in this research, including 6 new specimens not published in [22][23][24][25] consisting of T-beams with a top cast-in-place slab, are provided. The specimens had rectangular and T-shaped cross-sections and a high longitudinal reinforcement ratio.…”

“…A summary of the shear strength mechanisms, the failure modes, and the effect on the shear strength of the varied parameters is presented. As a new contribution, the model for explaining the shear strength of the specimens with web reinforcement presented in [24,25] is generalised in this paper to beam geometries and reinforcement layout other than those tested by the authors. A preliminary series (interface characterisation series) of 7 composite specimens was carried out to determine the design of the specimens so that they would fail by vertical shear and the failure would be influenced by the presence of the interface between concretes [22].…”