Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Bond behavior of fiber reinforced polymer bars under direct pullout conditions
Eurocrete was a 4-year research project that investigated the use of nonferrous (FRP) reinforcement in concrete structures. The Eurocrete project led to the development of a new durable FRP bar, which is now commercially available in the marketplace. This paper examines the behavior of Eurocrete fiber-reinforced polymer bars (glass, carbon, aramid, and hybrid) in concrete under direct pullout conditions. All the specimens in the experimental series of pullout tests failed in a pull-through mode of failure because the concrete cube provided adequate confinement to the bars that enabled them to reach their maximum bond strength. For concrete strengths greater than 30 MPa, failure occurs partly on the surface of the bar, not just in the concrete as in the case of steel bars, by peeling away part of the surface layer of the bar. Consequently, the bond strength of FRP bars is not controlled as much by concrete strength but appears to be influenced by the interlamina shear strength just below the resin rich surface layer of the bar. Chemical adhesion in the FRP bars and free end slip appear to be correlated and they happen when the bond stress is around 80 % of the bond strength. No significant difference was found betweeen the bond strengths developed by GFRP and CFRP bars. Aramid and hybrid development bars showed slightly lower bond strengths. Smaller diameter bars develop higher bond strengths than larger diameter bars.
Bond behavior of fiber reinforced polymer bars under direct pullout conditions
Eurocrete was a 4-year research project that investigated the use of nonferrous (FRP) reinforcement in concrete structures. The Eurocrete project led to the development of a new durable FRP bar, which is now commercially available in the marketplace. This paper examines the behavior of Eurocrete fiber-reinforced polymer bars (glass, carbon, aramid, and hybrid) in concrete under direct pullout conditions. All the specimens in the experimental series of pullout tests failed in a pull-through mode of failure because the concrete cube provided adequate confinement to the bars that enabled them to reach their maximum bond strength. For concrete strengths greater than 30 MPa, failure occurs partly on the surface of the bar, not just in the concrete as in the case of steel bars, by peeling away part of the surface layer of the bar. Consequently, the bond strength of FRP bars is not controlled as much by concrete strength but appears to be influenced by the interlamina shear strength just below the resin rich surface layer of the bar. Chemical adhesion in the FRP bars and free end slip appear to be correlated and they happen when the bond stress is around 80 % of the bond strength. No significant difference was found betweeen the bond strengths developed by GFRP and CFRP bars. Aramid and hybrid development bars showed slightly lower bond strengths. Smaller diameter bars develop higher bond strengths than larger diameter bars.
Bond behavior of fiber reinforced polymer bars under direct pullout conditions
Haftverhalten von faserverstärkten Kunststoffstäben unter direkten Pullout-Bedingungen
Achillides, Zenon (Autor:in) / Pilakoutas, Kypros (Autor:in)
Journal of Composites for Construction ; 8 ; 173-181
2004
9 Seiten, 14 Bilder, 5 Tabellen, 20 Quellen
Aufsatz (Zeitschrift)
Englisch
carbonfaserverstärkter Kunststoff , glasfaserverstärkter Kunststoff , faserverstärkter Kunststoff , Para-Aramidfaser , Hybridfaser , Stab , Verstärkung (Festigkeit) , Armierung , Beton , Haftfestigkeit , Messen mechanischer Größen , Prüfmethode , Stahl , Produktvergleich , Einflussgröße , Versagensart , Pultrudieren , Pullout Test (Faserprüfung)
Bond Behavior of Fiber Reinforced Polymer Bars under Direct Pullout Conditions
| Online Contents | 2004
Bond Behavior of Fiber Reinforced Polymer Bars under Direct Pullout Conditions
| British Library Online Contents | 2004
Bond Behaviour and Modeling of Fiber Reinforced Polymer Bars to Concrete under Direct Pullout
| British Library Conference Proceedings | 2007