Flexural tests on GFRP RC slabs: experimental results and numerical simulations

The excellent resistance to corrosion of Fiber Reinforced Polymer (FRP) Composite Materials undoubtedly is important when they are used to reinforce concrete structures, due to a great reduction of maintenance costs that are particularly relevant when referring to structures constantly exposed to severe weather conditions such as bridges. For these reasons, many research activities are aimed to validate theoretical models for the design of concrete members reinforced with FRP bars. In this framework, experimental tests were recently performed on concrete slabs reinforced with Glass FRP. Test results are shown and compared with theoretical predictions to point out benefits and limitations of such technology in serviceability and ultimate conditions. Moreover, strains and displacements recorded during the tests by means of several strain gauges and displacement transducers are shown and compared with the results of numerical simulations. Particular attention was addressed to modeling the effect of tension stiffening that is weaker when FRP bars instead of steel bars are used.