Non linear procedure for the analysis of FRP reinforced frames

The effect of the FRP strengthening on the global response of a portal r.c. frame is analysed in this paper. In order to account for the non linear phenomena due to the cracking in concrete, tension stiffening effects, yielding of steel and interaction at the FRP-concrete and steel-concrete interfaces, a suitable iterative methodology is developed and applied. The response of r.c. structures reinforced with different amount and location of FRP sheets, subjected to constant vertical loads and increasing horizontal actions, is judged on the basis of push-over analysis. The obtained results allow highlighting the variation of strength and ductility when different reinforcing schemes are adopted.