Compressive behavior of CFRP-confined square concrete columns”

Jacketing of the concrete leads to the increase of the strength and ductility of jacketed columns. A significant amount of research has been devoted to round columns that have been retrofitted with fiber-reinforced polymer (FRP), but much less is known about FRP-confined rectangular/square columns in which the concrete is non-uniformly confined and the effectiveness of confinement is much reduced. Results of an experimental investigation of the compressive behavior of square concrete columns confined by carbon FRP are presented. It was found that a simple formula which involves the definition of the equivalent round column and the shape factor can well estimate the compressive strength of the confined square columns

Compressive behavior of CFRP-confined square concrete columns”

Jacketing of the concrete leads to the increase of the strength and ductility of jacketed columns. A significant amount of research has been devoted to round columns that have been retrofitted with fiber-reinforced polymer (FRP), but much less is known about FRP-confined rectangular/square columns in which the concrete is non-uniformly confined and the effectiveness of confinement is much reduced. Results of an experimental investigation of the compressive behavior of square concrete columns confined by carbon FRP are presented. It was found that a simple formula which involves the definition of the equivalent round column and the shape factor can well estimate the compressive strength of the confined square columns

Properties of FRP-confined concrete columns under axial compressive loading

External confinement by the wrapping of fiber-reinforced polymer (FRP) composites sheets provides a very effective method for the strengthening and retrofit of round concrete columns. New formulas to estimate the ultimate axial strain and second tangent modulus E2 above the unconfined concrete strength are proposed for concrete columns confined by the FRP jacket in which the fibers are oriented in the hoop direction. These formulas are based on the use of the asymptotic value of the differential Poisson ratio (the first derivative of the lateral - axial strain curve). Comparison with the experimental data available in the published literature is done. The formulas are shown to be able to provide satisfactory estimation of the ultimate axial strain and the second tangent modulus E2 of stress strain relation above unconfined column strengt

Properties of FRP-confined concrete columns under axial compressive loading

External confinement by the wrapping of fiber-reinforced polymer (FRP) composites sheets provides a very effective method for the strengthening and retrofit of round concrete columns. New formulas to estimate the ultimate axial strain and second tangent modulus E2 above the unconfined concrete strength are proposed for concrete columns confined by the FRP jacket in which the fibers are oriented in the hoop direction. These formulas are based on the use of the asymptotic value of the differential Poisson ratio (the first derivative of the lateral - axial strain curve). Comparison with the experimental data available in the published literature is done. The formulas are shown to be able to provide satisfactory estimation of the ultimate axial strain and the second tangent modulus E2 of stress strain relation above unconfined column strengt

Mekaniska egenskaper hos CFRP-omslutna runda betongpelare med tryckarmering av st\ue5l under axiell tryckbelastning

H\ue5llfastheten, deformerbarhetenoch stabiliteten hos runda betongpelaresom omsluts av CFRP (kolfiberkompositark) unders\uf6ks underaxiell tryckbelastning. Formlernages f\uf6r f\uf6ruts\ue4gelse av h\ue5llfasthet,tryckt\uf6jning och tangentmodul ovangr\ue4nsen f\uf6r linearitet. J\ue4mf\uf6relseg\uf6rs med experimentella data somfinns i den publicerade litteraturen.CFRP-omslutna betongpelare medaxiell tryckarmering av st\ue5l unders\uf6ks.F\uf6rlusten av stabilitet hos betongpelareovan niv\ue5n f\uf6r den oarmeradeoch inte CFRP-omslutnabetongh\ue5llfastheten analyseras ochdet bel\ue4ggs att CFRP-omslutning \ue4reffektiv endast f\uf6r pelare som harl\ue5g eller m\ue5ttlig slankhet (

Mekaniska egenskaper hos CFRP-omslutna runda betongpelare med tryckarmering av st\ue5l under axiell tryckbelastning

H\ue5llfastheten, deformerbarhetenoch stabiliteten hos runda betongpelaresom omsluts av CFRP (kolfiberkompositark) unders\uf6ks underaxiell tryckbelastning. Formlernages f\uf6r f\uf6ruts\ue4gelse av h\ue5llfasthet,tryckt\uf6jning och tangentmodul ovangr\ue4nsen f\uf6r linearitet. J\ue4mf\uf6relseg\uf6rs med experimentella data somfinns i den publicerade litteraturen.CFRP-omslutna betongpelare medaxiell tryckarmering av st\ue5l unders\uf6ks.F\uf6rlusten av stabilitet hos betongpelareovan niv\ue5n f\uf6r den oarmeradeoch inte CFRP-omslutnabetongh\ue5llfastheten analyseras ochdet bel\ue4ggs att CFRP-omslutning \ue4reffektiv endast f\uf6r pelare som harl\ue5g eller m\ue5ttlig slankhet (