Author/Authors :
Ilia Elaheh نويسنده is a PhD student at Civil Engineering Department in Isfahan University of Technology , Mosto nejad Davood نويسنده is a Professor at Civil Engineering Department in Isfahan University of Technology , Moghaddas Amirreza نويسنده is a PhD candidate at Civil Engineering Department in Isfahan University of Technology
Abstract :
Con ning concrete columns by means of Fiber Reinforced Polymer (FRP)
composites is the most common method used for enhancing the strength and ductility
of concrete compression members. The shape of column section is taken from the
signi cant parameters a ecting eciency of composite in con nement. In rectilinear
columns, due to stress concentration on corners, the concrete is non-uniformly con ned
and the e ectiveness of con nement is much reduced compared to circular columns. In this
study, the compressive behavior of 9 rectilinear RC columns con ned with CFRP strips is
experimentally examined. To improve the con nement e ectiveness in columns, some of
the specimens are locally strengthened with CFRP strips at corners, before the application
of horizontal CFRP wrapping. The number of con ning layers and the shape of rectilinear
section (square or rectangular) are the main parameters under investigation. Based on
results of the current study, local reinforcement at the corners of rectilinear columns before
horizontal wrapping eliminates stress concentration on the corners and avoids premature
rupture of CFRP con ning layers at these parts; thus increases the eciency of composite
in con nement. Furthermore, local reinforcement of the corners of column section is more
e ective in RC columns with square sections compared to rectangular sections.
