Abstract
This paper presents results of punching tests carried out in four reinforced concrete flat slabs, one of them without shear reinforcement and others strengthened with CFRP dowels. Slabs were 1000 mm square meters and 60 mm thick and were subjected to mid span loadings until failure. The strengthening arrangements were radial and cruciform, varying the number of layers of CFRP dowels. The results presented include vertical displacements, strain on steel and concrete, ultimate loads and failure mode, as well as estimation of resistance based on the Brazilian standards. It was observed significant improvement on punching resistance of the strengthened slabs when compared to the reference slab, highlighting the good performance for the strengthening system evaluated.
Highlights
The flat slab structural system consists of slabs directly supported on columns and has been widely used due to several advantages when compared to other systems
According to Binici and Bayrak (2003), the load increase for changes in the structure usage, construction errors, or even inconsistency with the current standards may lead to the need of increasing the flat slab punching resistance to ensure the structure safety
This article aims to experimentally evaluate the resistance of two-way flat slabs of reinforced concrete without shear reinforcement strengthened to punching with carbon fiber
Summary
The flat slab structural system consists of slabs directly supported on columns and has been widely used due to several advantages when compared to other systems Some of these advantages are: simplicity of formwork and rebar, reducing costs and runtime; reducing the final height of the building and reducing the material cost; and increasing the flexibility of layouts due to the absence of beams and capitals. This system has significant weaknesses in the slab-pillar connection due to the risk of sudden failure by punching.
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