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The use of Glass fiber-reinforced polymers (GFRP) rebar in structural applications has been getting increasing attention due to the advantages it offers over conventional reinforcement (e.g. durability, light weight, magnetic neutrality). A possible application of GFRP rebar reinforcement is in the area of multi-storey structural frames. During late seismic tremors, numerous basic breakdown were started or brought about by bar segment joint disappointments. There are no complete seismic guidelines for the use of GFRP materials. Consequently, research is needed to gain a better understanding of the behavior of GFRP materials and their interaction with traditional materials in such application in order to implement their use on solid grounds. In this study, two full-scale quasi-static loading tests were performed on single storey portal frame specimens. The first test was performed on a Portal frame specimen reinforced with steel and its behavior was compared to that of a second similar test performed on a GFRP-reinforced Portal frame specimen.