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• W2971320293 abstract "In this thesis, the experimental programmes andnumerical investigations are described that have been conducted topartially cover the knowledge gap in the field of strengtheningtwo-way reinforced concrete (RC) flat slabs. The conducted studiesdemonstrate that the most common method to strengthen two-way RCslabs is by applying fibre reinforced polymers (FRP) on the tensionsurface of the slabs. Applying prestressed FRP to strengthentwo-way flat slabs combines the advantages of both FRPstrengthening and prestressing to enhance the efficiency of thestrengthening methods. Hence, two previous studies on strengtheningtwo-way flat slabs with non-prestressed and prestressed FRP areanalysed to clarify the effect of different strengthening methodson the behaviour of slabs. Both studies demonstrate the benefits ofapplying non-prestressed FRP to enhance the structures’capacities. However, for the case of strengthening RC slabs withprestressed FRP, the results seem to be controversial and morestudies are necessary to arrive at a conclusion on whether it isfeasible to strengthen RC slabs with prestressed FRP. Furtheranalysis indicates that there is an optimum percentage ofprestressing for the FRPs applied to RC slabs. Increasing theprestressing ratio of FRP to the optimal percentage increases theultimate load capacity of the RC slabs. However, increasing theprestressing ratio of FRPs beyond the optimum value can causede-bonding and loss of composite action, which prevents the RC slabfrom reaching its expected ultimate load capacity. The optimumprestressing ratio of FRP depends on the prestress load as well asthe concrete tensile strength and slab depth. Eventually, a formulais proposed to estimate the optimum FRP-prestress ratio consideringthe effective parameters in both concrete and FRP. Moreover, thisthesis elaborates on an investigation that was conducted to make acomparison between the effects of different strengthening methodssuch as FRP strengthening, applying vertical (shear) reinforcement,and their combination, on the behaviour of flat slabs withdifferent conditions (tensile reinforcement ratios). To conduct theinvestigation, eight slab specimens were cast, which wereclassified into two categories: low and high tensile reinforcementratios. The strengthening methods included applying FRP sheets tothe tension surface of the RC slabs externally, applying vertical(shear) reinforcement, and a combination of both methods. Theexperimental and validated numerical results demonstrate that themost efficient strengthening strategy is a combination ofstrengthening methods in both categories. Strengthening with FRPsheets improves the slabs load capacity in both categories.However, applying vertical (shear) reinforcement does notsignificantly affect the behaviour of RC slabs with a low tensilereinforcement ratio. From the resulting analyses, it was concludedthat the strut and tie model of the FRP strengthened structurechanges compared with the control specimen. This enablesresearchers and…" @default.
• W2971320293 created "2019-09-05" @default.
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• W2971320293 date "2018-01-01" @default.
• W2971320293 modified "2023-09-23" @default.
• W2971320293 title "Structural analysis of strengthened RC slabs" @default.
• W2971320293 hasPublicationYear "2018" @default.
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