The use of fibre reinforced polymer (FRP) composites has been successfully promoted for external confinement of reinforced concrete (RC) columns and pillars all over the world. Increase in compressive capacity and energy absorption before collapse have been largely experienced in laboratory environment during the last decade, especially by testing concrete cylinders wrapped with FRP jackets. In this study the results of a large test program are presented with the objective of examining the effect of various experimental parameters on the confinement effectiveness of FRP jackets on both circular and rectangular concrete columns. The experimental parameters include: different concrete strength, type of fibres, number of wrap layers, geometry of column, corners radius and cross-sectional aspect ratio for rectangular columns. FRP-confined and unconfined specimens have been loaded in uniaxial compression. Compressive stress, axial and hoop strains have been measured to evaluate the stress-strain relationships, ultimate strength, stiffness, and ductility of the specimens. Results confirmed that external confinement produced by FRP can significantly enhance strength, ductility and energy absorption capacity if compared to those of plain concrete. The effects of test parameters are evidenced and compared; important design information is furnished to researchers and practitioners.
FRP-Confinement of Concrete Cylinders and Prisms
MICELLI, Francesco;
2005-01-01
Abstract
The use of fibre reinforced polymer (FRP) composites has been successfully promoted for external confinement of reinforced concrete (RC) columns and pillars all over the world. Increase in compressive capacity and energy absorption before collapse have been largely experienced in laboratory environment during the last decade, especially by testing concrete cylinders wrapped with FRP jackets. In this study the results of a large test program are presented with the objective of examining the effect of various experimental parameters on the confinement effectiveness of FRP jackets on both circular and rectangular concrete columns. The experimental parameters include: different concrete strength, type of fibres, number of wrap layers, geometry of column, corners radius and cross-sectional aspect ratio for rectangular columns. FRP-confined and unconfined specimens have been loaded in uniaxial compression. Compressive stress, axial and hoop strains have been measured to evaluate the stress-strain relationships, ultimate strength, stiffness, and ductility of the specimens. Results confirmed that external confinement produced by FRP can significantly enhance strength, ductility and energy absorption capacity if compared to those of plain concrete. The effects of test parameters are evidenced and compared; important design information is furnished to researchers and practitioners.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
