An experimental analysis of reinforced-concrete columns was conducted in the paper to evaluate the effectiveness of circular, rectangular and square cross sections strengthened with the glass fibre reinforced polymer (GFRP) when subjected to eccentric loading. Parameters analysed in the paper are the type of cross section and eccentricity values. It was established that, due to uniform loading, the strength increase of circular sections is greater compared to square and rectangular sections. In addition, the strength and ductility of columns increase with the fibre reinforced polymer wrapping. Analiza ekscentrično opterećenih kratkih ab stupova ojačanih polimerom armiranim staklenim vlaknima U radu je provedena eksperimentalna analiza armiranobetonskih stupova kako bi se odredila učinkovitost kružnih, pravokutnih i kvadratnih poprečnih presjeka ojačanih polimerom armiranim staklenim vlaknima (GFRP), pod utjecajem ekscentričnog opterećenja. Parametri koji se analiziraju su vrsta poprečnog presjeka i vrijednosti ekscentričnosti. Dobiveno je da se kod kružnih presjeka zbog jednolikog opterećenja postiže veće povećanje čvrstoće u usporedbi s kvadratnim i pravokutnim presjecima. Također se čvrstoća i duktilnost stupova povećavaju ojačanjem presjeka polimerom armiran vlaknima. (1) and (2) are used to calculate the axial compressive strength of a non-slender, normal weight concrete member confined with an FRP jacket. For nonprestressed members with existing steel spiral reinforcement:For non-prestressed members with existing steel-tie reinforcementAccording to available literature, many axial compressive strength tests have been conducted on circular specimens, while just a small number of tests were conducted on noncircular reinforced concrete specimens confined with FRP. The existing strength model for FRP-confined concrete assumes the following form [9]:where f' cc and f' co are compressive strengths of the confined and unconfined concrete, respectively, while k 1 is the confinement effectiveness coefficient. The confinement effectiveness coefficient k 1 is calculated according to Eq. (4) [18]..

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