INFLUENCES OF INTERFACE BETWEEN CONCRETE AND STRAND IN THE WEB SHEAR FAILURE OF HOLLOW CORE SLABS

Resumo

Many researches have been carried out in the world about hollow core slabs. One area that
has the most of those researches is about web shear failure to represent more accurately the shear
strength. One of those uncertainties is related with the behavior the interface between concrete and slab.
Therefore, in this research a hollow core slab that already were carried out for other researcher was
modelled, wherein the main variable is the interface law with aim to verify what the influence in shear
strength, variating tensile strength and slip. Firstly, one curve, which is present in the software and was
created for Doer in 1980, was used. The results showed that tensile strength of interface influences the
shear strength and the how the hardness of interface law affects the slab strength. Beside, a analyze
strain is realized to verify a concrete behavior. Lastly, is processed a model without stands and prestress
to understand show influences of prestress in the slab and it was compared with Brazilian code.