Punching shear strengthening of flat slabs: CFRP and shear reinforcement
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abstract
Punching in slabs is usually associated to the application of concentrated loads or to the presence of
columns. One of the main concerns related to flat slabs is its punching shear capacity at slabcolumn
connection, which is subjected to a very complex three-dimensional stress state. Provided
that bending capacity is installed, punching shear failure is hence characterized by the development
of a truncated cone shaped surface at the slab-column connection. The experimental programme
carried out by the authors includes four normal strength concrete slabs (1100×1100×100 mm3),
with and without shear reinforcement, submitted to punching under a concentrated load. One of the
specimens included typical bent-down bars as shear reinforcement. Frequently, there is the need to
strengthen existing flat slabs against punching shear failure. Current paper intends to further
investigate the structural response of such reinforcement techniques. One of the strengthening
practices, which have been tested within current experimental programme, consists on gluing
carbon fibre reinforced polymers on concrete surface. Moreover, the near surface mounted
technique has also been tested within current experimental work. Finally, a fourth specimen served
as reference. The effects of shear reinforcement and of the carbon fibre reinforced polymers
enhancing punching shear capacity are observed.
