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Punching shear behavior of fiber reinforced polymers reinforced concrete flat slabs: Experimental study
This paper presents the results of a two-phase experimental program investigating the punching shear behavior of fiber reinforced polymer reinforced concrete (FRP RC) flat slabs with and without carbon fiber reinforced polymer (CFRP) shear reinforcement. In the first phase, problems of bond slip and crack localization were identified. The slab is supported througha column stub on a beam reacting against two reaction ring frames. Equal point loads are applied downwards symmetrically at eight locations on a circle. The main flexural cracks developed directly above the longitudinal reinforcement of all slabs and led to bond splitting in the slabs with low reinforcement ratios. The smaller fluxural bar spacing in the second phase of slabs eliminated the problems of concrete splitting and prevented the bond slip failure in these slabs, which failed in punching shear. A modified strain approach for calculating the concrete shear resistance is proposed and was demonstrated to accurately predict the punching shear capacities of FRP RC flat slabs. The punching shear capacity of FRP RC slabs with FRP shear reinforcement is most accurately predicted by halving the calculated concrete contribution of the modified approach. For the shear reinforcement, the strain limit of 0.0045 is proposed. The maximum spacing for shear reinforcement is also proposed to be 0.5d.
Punching shear behavior of fiber reinforced polymers reinforced concrete flat slabs: Experimental study
This paper presents the results of a two-phase experimental program investigating the punching shear behavior of fiber reinforced polymer reinforced concrete (FRP RC) flat slabs with and without carbon fiber reinforced polymer (CFRP) shear reinforcement. In the first phase, problems of bond slip and crack localization were identified. The slab is supported througha column stub on a beam reacting against two reaction ring frames. Equal point loads are applied downwards symmetrically at eight locations on a circle. The main flexural cracks developed directly above the longitudinal reinforcement of all slabs and led to bond splitting in the slabs with low reinforcement ratios. The smaller fluxural bar spacing in the second phase of slabs eliminated the problems of concrete splitting and prevented the bond slip failure in these slabs, which failed in punching shear. A modified strain approach for calculating the concrete shear resistance is proposed and was demonstrated to accurately predict the punching shear capacities of FRP RC flat slabs. The punching shear capacity of FRP RC slabs with FRP shear reinforcement is most accurately predicted by halving the calculated concrete contribution of the modified approach. For the shear reinforcement, the strain limit of 0.0045 is proposed. The maximum spacing for shear reinforcement is also proposed to be 0.5d.
Punching shear behavior of fiber reinforced polymers reinforced concrete flat slabs: Experimental study
Scherverhalten von mit faserverstärkten Kunststoffen verstärkten, flachen Betonplatten unter Stempeldruck: Eine experimentelle Untersuchung
El-Ghandour, A.W. (author) / Pilakoutas, K. (author) / Waldron, P. (author)
Journal of Composites for Construction ; 7 ; 258-265
2003
8 Seiten, 13 Bilder, 2 Tabellen, 17 Quellen
Article (Journal)
English
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