Vol.8, No 2, 2010 pp. 177 - 185
UDC 624.072.22:691.32(045)=111
DOI: 10.2298/FUACE1002177R
EFFECTS OF RC BEAMS REINFOCEMENT USING NEAR SURFACE MOUNTED REINFORCED FRP COMPOSITES
Slobodan Ranković1, Radomir Folić2, Marina Mijalković1
1The Faculty of Civil Engineering and Architecture of Niš, Serbia
2Department of Civil Engineering of the Faculty of Technical Sciences, Novi Sad, Serbia
This paper analyzes application of modern reinforcement methods for reinforced concrete (RC) beams using fiber-reinforced polymer (FRP) materials. Basic characteristics of FRP materials and the method of mounting the FRP bars within concrete, that is, near the surface of the beams (NSM method) are presented. The properties of this method and its advantages in comparison to externally bonded reinforcement laminate method (EBR) have been analyzed. The results of measured deflections and width of the cracks of the beams reinforced by FRP bars, depending on the load are presented and discussed, in comparison to the results obtained from the non-reinforced beams. The experimental research was published at the Faculty of Civil Engineering and Architecture of Niš in 2009.
Key words: Strengthening, FRP composite, NSM method, GFRP reinforcement, testing
EFEKTI OJAČNJA AB GREDA ŠIPKAMA OD VLAKNASTIH KOMPOZITA POSTAVLJENIM UNUTAR ZAŠTITNOG SLOJA BETONA
U radu je analizirana primena savremene tehnike ojačanja armiranobetonskih (AB) greda upotrebom elemenata od FRP materijala (polimera ojačanih vlaknima, tj. vlaknastih kompozita). Prikazane su osnovne karakteristike FRP materijala i metode postavljanja FRP šipki unutar zaštitnog sloja betona, tj. blizu površine greda (NSM metoda). Analizirana su svojstva ove metode i njene prednosti u odnosu na spolja lepljene FRP laminate (EBR metoda). Prikazani su i diskutovani rezultati merenih ugiba i širine prslina ispitivanja grednih nosača, ojačanih GFRP šipkama, zavisno od opterećenja, uz upoređenje sa rezultatima dobijenim na neojačanoj gredi. Eksperimentalna istraživanja su obavljena na GAF u Nišu 2009. godine.
Ključne reči: Ojačanje, FRP kompoziti, NSM metoda, GFRP šipke, ispitivanje