With higher point loads, structural slabs are exposed to shear stresses, bending moments and deformations. It is indeed important to ensure the capability and reliability of the structural slab as it serves as the foundation of the whole structure.
The most vital part in designing and constructing SFRC structural slabs relies on the correct combination of appropriate tensile strength characteristics and dosage of steel fibres along with high-quality concrete mix and local reinforcement against the calculated loads of the structure. This will ensure the capacity of the structural slab to absorb bending moments and shear stresses on structural application. Steel fibres act as linkage and reinforcement to concrete that transmits stresses across the cracks to resist the widening of fractures and avoids shrinkage and deformations.
Punching shear consideration
Punching shear capacity is determined in accordance with Eurocode 2 by checking the shear at the face of the contact area and at the critical perimeter distance 2.0d (where d is the effective depth) from the face of the contact area. Generally, the latter will control load capacity. Eurocode 2 is written based on conventional bar (or fabric) reinforcement and hence does not define an effective depth for fibre-reinforced or unreinforced concrete slabs. Following TR34 the effective depth for a fibre-reinforced or unreinforced slab should be taken as 0.75h where h is the overall depth.
Allowance is made for the fact that some of the load will be transferred directly through the slab to the ground.
WHAT TWINTEC CAN OFFER
Twintec possesses solid experience on the structural design and construction of concrete mat slab bodies as applied to automated, rack-supported buildings. The use of high tensile strength steel fibres, when incorporated in a specifically adapted concrete mix, will not only control shrinkage within the concrete body but will also provide it with the structural properties of heavily reinforced concrete. In addition, the use of advanced steel fibre reinforcement instead of conventional rebar steel reinforcement allows for the pouring of large areas in a faster and safer manner.
CONTACT US
For further information visit Twintec Group Products - Twintec® STRUCTURAL or email mail@twintecgroup.com