SFRC flat slabs punching behaviour – Experimental research

Gouveia, Nuno D.; Fernandes, N.; Faria, Duarte M.V.; Ramos, Aura; Lúcio, Válter José da Guia

doi:10.1016/j.compositesb.2014.04.005

Cited by 41 publications

(21 citation statements)

References 12 publications

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“…Similar results were obtained by Ref. [19], that show a variation of the average failure cone angle, depending on the fiber amount. Consequently, the use of steel fiber reinforced concrete increased both bearing capacity and ductility of flat slabs.…”

Section: Introductionsupporting

confidence: 89%

Punching shear behavior of lightweight fiber reinforced concrete slabs

Caratelli

Imperatore

Meda

et al. 2016

Composites Part B: Engineering

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Section: Introductionsupporting

confidence: 89%

Punching shear behavior of lightweight fiber reinforced concrete slabs

Caratelli

Imperatore

Meda

et al. 2016

Composites Part B: Engineering

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“…This particular characteristic was preponderant for the utilization of the CSCT to evaluate the punching shear capacity of existing slabs strengthened with BRCO, after introducing some modifications to make the CSCT suitable to this particular case. The CSCT versatility allows for it to be applied in many different cases, like flat slabs with asymmetric reinforcement (Sagaseta et al, 2011), shear reinforcement (Ruiz et al, 2009;Lips, 2012), steel fibre reinforced concrete (Maya et al, 2012;Gouveia et al, 2014), and prestressed concrete slabs (Climent et al, 2013 and. It can also be applied to strengthening techniques like the use of externally glued fibre reinforced polymers or postinstalled shear reinforcement (Ruiz et al,2010;Silva et al, 2013;Inácio et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of flat slabs strengthened with a bonded reinforced-concrete overlay

Lapi

Fernandes

Orlando

et al. 2018

Magazine of Concrete Research

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Punching strengthening of R/C slabs using a Bonded Reinforced Concrete Overlay (BRCO) is an efficient alternative to traditional strengthening systems such as post-installed shear reinforcement, enlargement of the support column, or bonded FRP strips. The BRCO technique allows for both flexural stiffness and shear strength of existing slabs to be increased. Shear strength increases due to the greater slab thickness, while the increase in flexural stiffness is also provided by the added reinforcement. A special attention regarding the interface between the existing slab and the BRCO is required, since performance gains can only be achieved if the existing slab and the new concrete layer work monolithically. Interface performance can be improved through surface preparation and mechanical connectors, the latter is recommended to avoid a premature debonding failure. This paper presents an ad-hoc design approach for flat-slabs strengthened with BRCO based on the Critical Shear Crack Theory (CSCT), which accounts for the slab rotation after strengthening. This is a fundamental ′ curvature corresponding to ′ of strengthened section , curvature corresponding to the yielding of existing reinforcement slab rotation slab rotation at failure slab rotation at strengthening

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“…(11): where a e is the fibre engagement parameter, with a recommend value of 3.5 for hooked end fibres [36], s b is the mean shear stress between the fibre and the matrix measured. s b can be taken as 0.8 p f cf for normal-strength concrete [23]. Fig.…”

Section: Modelling Tensile Behaviourmentioning

confidence: 99%