Abstract
The increasing use of FRP composites to strengthen and repair the structural bearing components, also low weight, high flexibility, ease of transportation, high speed, ease of cutting in desired sizes, ease of performance and possibility of external strengthening are the major reasons for using the FRP laminates in repairing concrete structures compared to other methods. One usage of FRP laminates is strengthening the reinforced concrete slabs. Present article studied the impact of type and number of composite layers in flexural strengthening of the reinforced concrete voided slabs with FRP laminates. The voided slabs are used to reduce concreting volume, costs and also decreasing weight of the structure. Some of these buildings and bridges have been severely damaged due to natural disasters including earthquake, wind or fatigue of materials and alkaline and acidic corrosive agents. Therefore, repair and strengthening the bearing surfaces of above structures is vital and economical. Present research has investigated the parametric study of the impact of type and thickness of FRP fibers on flexural behaviour of strengthened voided slabs using different FRP systems (CFRP-GFRP). For this purpose, the voided concrete ceiling is modelled in ANSYS software, then it is compared to the available laboratory model for verification of the problem. After the verification, by changing the parameters of type and thickness of RFP fibers in the modelled voided slab, ultimate strength of the slab has been studied. These studies have showed that the slabs retrofitted with GFRP fibers have a better ductility compared to the slabs retrofitted with CFRP fibers, but ultimate strength of the slabs retrofitted with CFRP is significantly more than the slabs strengthened with GFRP fibers. It was also found that by increase in the number of laminated composite layers in retrofitted voided slabs, ultimate capacity of the voided slabs is increased.
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