Naslov
Stress And Strain Distribution In Concrete Beams Reinforced With FRP Bars

Autori
Kišiček, Tomislav ; Sorić, Zorislav ; Galić, Josip

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 9th International Symposium on Fiber-Reinforced Polymer Reinforcement for Concrete Structures / Oehlers, D.J. ; Griffith, M.C. ; Seracino, R. - Sydney : FRPRCS, 2009, 1-4

ISBN
978 0 9806755 0 4

Skup
9th International Symposium on Fiber-Reinforced Polymer Reinforcement for Concrete Structures (9 ; 2009)

Mjesto i datum
Sydney, Australija, 13.07.2009. - 15.07.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
concrete; FRP bars; numerical procedure; bond/slip behaviour; curvature; deflection

Sažetak
The most common material in the construction of buildings is a concrete reinforced with steel reinforcement. If reinforced concrete element was placed in aggressive environment, its deterioration due to corrosion of steel reinforcement will start soon. In the last few decades a lot of attention has been devoted to fiber reinforced polymer (FRP) as a replacement for steel reinforcement. FRP materials could be produced from glass (G), aramid (A) or carbon (C) fibers which are connected with epoxy resin, polyester or vinyl-ester, and therefore they can be distinguished as GFRP, AFRP and CFRP products. Beside the fact that FRP products do not corrode, they have other good characteristics such as: high tensile strength, good behavior under dynamic loadings (CFRP), little relaxation, moisture resistance, and low weight. They are magnetic resistant and electric isolators. FRP products also have deficiencies such as elastic behavior until failure and big differences between longitudinal and transversal mechanical characteristics and between tensile and compressive stresses. Main deficiencies of FRP when compared to steel reinforcement are their non-ductile behavior and creep rupture. In general, FRP materials have lower modulus of elasticity than steel reinforcement, and lower longitudinal coefficient of thermal expansion. FRP reinforcement is sensitive to ultraviolet exposure. GFRP is also sensitive to alkaline environment. The iterative numerical procedure for calculation of stresses and strains of concrete and FRP reinforcement in concrete beam reinforced with FRP bars has been developed. The focus of this procedure was distribution of stresses and strains, between two adjacent cracks. This is important because strains of reinforcement and concrete are main parameters for calculation of curvature of cross section and therefore, for calculation of deflections of reinforced concrete beams. The procedure included bond/slip behavior of reinforcement and formation of new crack(s) between initial ones. In the analysis the real bond/slip curve could be used, as well as idealized one. In this paper, the impact of bond/slip curves on speed and accuracy of iterative numerical procedure would be analyzed.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

Napomena
Radovi sa skupa su kao sazetak tiskani u Knjizi sazetaka, a na CD je objavljen cjeloviti tekst, koji ima 4 stranice.

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