TY - GEN
T1 - Axial behavior of FRP jacketed extended rectangular members constructed with low strength concrete
AU - Akgun, Dogan
AU - Demir, Cem
AU - Ilki, Alper
PY - 2011
Y1 - 2011
N2 - While extensive experimental data is present on the axial behavior of FRP jacketed concrete members with circular cross-section, only few data is available for the members with square and rectangular cross-sections. Furthermore, the data is particularly scarce for extended rectangular cross-sections, where the cross-sectional aspect ratio is over two. In addition, most of the existing codes and/or guidelines limit the cross-sectional aspect ratio with 1.5-2.0 due to significantly reduced efficiency of FRP confinement beyond these cross-sectional aspect ratios. In this study, specimens with the cross-sectional aspect ratio of 3.0 are tested under axial compression by using a displacementontrolled 5000 kN-capacity Instron testing system. While keeping the thickness of external FRP jacket same in all specimens, the arrangement of FRP sheets, which are used in the form of cross-ties are changed. The concrete quality of the specimens is intentionally poor for representing existing weak structural members. Experimental results showed that the efficiency of FRP jacketing was quite high for the extended rectangular cross-sections in case of low strength concrete. In addition, the efficiency of FRP jacketing could further be increased by the use of additional FRP sheets in the form of cross-ties. In the analytical part, the increased efficiency of the FRP jacketing due to presence of FRP cross-ties is explained using the concept of efficiently confined cross-section developed before for concrete confined with steel rectilinear stirrups and cross-ties.
AB - While extensive experimental data is present on the axial behavior of FRP jacketed concrete members with circular cross-section, only few data is available for the members with square and rectangular cross-sections. Furthermore, the data is particularly scarce for extended rectangular cross-sections, where the cross-sectional aspect ratio is over two. In addition, most of the existing codes and/or guidelines limit the cross-sectional aspect ratio with 1.5-2.0 due to significantly reduced efficiency of FRP confinement beyond these cross-sectional aspect ratios. In this study, specimens with the cross-sectional aspect ratio of 3.0 are tested under axial compression by using a displacementontrolled 5000 kN-capacity Instron testing system. While keeping the thickness of external FRP jacket same in all specimens, the arrangement of FRP sheets, which are used in the form of cross-ties are changed. The concrete quality of the specimens is intentionally poor for representing existing weak structural members. Experimental results showed that the efficiency of FRP jacketing was quite high for the extended rectangular cross-sections in case of low strength concrete. In addition, the efficiency of FRP jacketing could further be increased by the use of additional FRP sheets in the form of cross-ties. In the analytical part, the increased efficiency of the FRP jacketing due to presence of FRP cross-ties is explained using the concept of efficiently confined cross-section developed before for concrete confined with steel rectilinear stirrups and cross-ties.
UR - https://www.scopus.com/pages/publications/84896484009
U2 - 10.1007/978-3-642-17487-2_136
DO - 10.1007/978-3-642-17487-2_136
M3 - Conference contribution
AN - SCOPUS:84896484009
SN - 9783642174865
T3 - Advances in FRP Composites in Civil Engineering - Proceedings of the 5th International Conference on FRP Composites in Civil Engineering, CICE 2010
SP - 622
EP - 625
BT - Advances in FRP Composites in Civil Engineering - Proceedings of the 5th International Conference on FRP Composites in Civil Engineering, CICE 2010
PB - Springer Berlin Heidelberg
T2 - 5th International Conference on FRP Composites in Civil Engineering, CICE 2010
Y2 - 27 September 2010 through 29 September 2010
ER -