000013418 001__ 13418
000013418 005__ 20161114164234.0
000013418 04107 $$aeng
000013418 046__ $$k2011-05-25
000013418 100__ $$aMegalooikonomou, K.
000013418 24500 $$aConstitutive Model for Frp and Tie-Confined Concrete

000013418 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013418 260__ $$bNational Technical University of Athens, 2011
000013418 506__ $$arestricted
000013418 520__ $$2eng$$aConfining wraps or jackets to rehabilitate and strengthen existing concrete columns has proven to be an efficient technique for seismic retrofit of structures. However, most of the compressive strength models of confined concrete only consider the increased strength and ductility provided by fiber reinforced polymers (FRPs), neglecting the contribution of the existing steel reinforcement inside the column’s section. Even if the existing steel stirrups in a reinforced concrete column are not sufficient to confine the concrete core, they must also contribute along with the FRP jacket in confining the section. Therefore, the FRP-confined concrete model proposal by fib has been enhanced to take into account the confining effect of the already existing steel reinforcement when retrofitting a reinforced concrete column with FRP jacketing. To this end, confining pressures contributed at each step of deformation by the case of existing transverse and longitudinal steel reinforcement have been evaluated considering the stress-strain law of the reinforcing steel. Moreover, compatibility of strain in the lateral direction between the jacketing system and the encased concrete is enforced. Finally, the bilinear stress-strain response of FRP-confined concrete is terminated by jacket rupture owing to hoop strains exceeding the strain capacity of the material or to interaction of the jacket with the buckled longitudinal bars. Correlation with three experimental studies gives promising results.

000013418 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013418 653__ $$aFRP, Steel Ties, Circular Section, Model, Confinement, Buckling

000013418 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013418 720__ $$aMegalooikonomou, K.$$iMonti, G.$$iSantini, S.
000013418 8560_ $$ffischerc@itam.cas.cz
000013418 8564_ $$s3121003$$uhttp://invenio.itam.cas.cz/record/13418/files/080.pdf$$yOriginal version of the author's contribution as presented on CD, section: RS 18 Repair and Retrofit of Structures.
000013418 962__ $$r13401
000013418 980__ $$aPAPER