Name: Lucas Fadini Favarato
Type: MSc dissertation
Publication date: 26/08/2021
Advisor:

Namesort descending Role
Adenilcia Fernanda Grobério Calenzani Advisor *

Examining board:

Namesort descending Role
Adenilcia Fernanda Grobério Calenzani Advisor *
Johann Andrade Ferrareto External Examiner *
Juliana da Cruz Vianna Pires Co advisor *
Macksuel Soares de Azevedo Internal Examiner *
Rodrigo Barreto Caldas External Examiner *

Summary: Composite slabs are high-performant structural elements made of concrete and of structural cold-formed steel sections, mechanically connected to grant the shear transfer between them. Furthermore, they play an important role in design of structures due to the dead load reduction and loads into foundations. On account of increased demand for industrialized systems for buildings, the composite slabs can produce great impact in reduction of floor depth while spanning longer to meet architectural needs for column-free areas. In this context, a novel system was recently released in the market as an optimized version of the reinforced concrete ribbed slabs, although made of a cold-formed steel lipped channel section in minor bending as permanent shuttering fastened to a rebar truss through uniformly distributed plastic connectors. Likewise, light filling blocks usually made in Expanded Polystyrene are employed between ribs to reduce dead loads. However, the shear behavior between shuttering and concrete at bottom ribs had not been fully investigated through full-scale experiments, reason why it’s still designed as a non-composite system. Data found in the literature has evidenced full-interaction between both structural elements when tested with span of 2500 mm and shear span of 625 mm (L/4), although it’s insufficient to draw a safe conclusion regarding its shear behavior. As such, this research expanded the aforementioned test scope to include an extra group of the four-point bending test according to the EN 1994-1-1 (CEN, 2004) with same span of 2500 mm, however with a larger shear span of 833 mm (L/3). Finally, reinforced concrete slabs with same dimensions – however without the steel shuttering – were cast and tested under identical conditions to quantify the formwork contribution to the final slab strength. Therefore, the lipped channel steel profile fully interacted with concrete with no measured end-slips, which has increased the characteristic bending resistance in more than 80% while soaring the ductility in five times. Finally, seven models found in the literature to calculate the effective moment of inertia were compared with testing results, from which the cracked stiffness yielded to best results.

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