The present work deals with the post strengthening of concrete slabs and the numerical calculation of their load carrying behavior. The used strengthening materials are Fiber Reinforced Polymers (FRP) which are of increasing interest in the civil engineering applications, i.e. textile reinforced concrete tubes, cables of cable-stayed bridges or even entire bridges. In this work, the used FRPs consist of carbon fibers in a epoxy-matrix or glass fibers in a vinylester-matrix. The reinforced polymers were applied in different ways to concrete salbs; the strengthened structures have been tested to failure. Afterwards, nonlinear finite element analyses are performed gaining more informations about modelling and prediction of the structural response of strengthened constructions.
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