000021540 001__ 21540
000021540 005__ 20170622131251.0
000021540 04107 $$aeng
000021540 046__ $$k2017-06-15
000021540 100__ $$aZoppo, Marta Del
000021540 24500 $$aBEHAVIOR OF CFRP CONFINED RC COLUMNS UNDER AXIAL LOAD AND UNIAXIAL CYCLIC LATERAL LOADING

000021540 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021540 260__ $$bNational Technical University of Athens, 2017
000021540 506__ $$arestricted
000021540 520__ $$2eng$$aIn recent years, the use of FRP wrapping of reinforced concrete (RC) members has been recognized as a reliable method for seismic retrofit of existing structures. The external confinement of existing RC columns with FRPs is a sound technique for increasing the columns ductility, by preventing brittle mechanisms such as bars buckling or post-yielding shear failures and by improving the mechanical properties of concrete due to the lateral confining effect. Several models have been developed for predicting the ultimate displacement capacity and the ductility of FRP confined RC columns, however the accuracy of predictions has not been well established yet. In this study, the experimental behavior of a RC column confined at the plastic hinge region with one ply of carbon fibers (CFRP) is firstly analyzed and compared with the response of the unstrengthened control column. The specimens are cantilevers loaded with a low compressive axial load and subjected to uniaxial cyclic horizontal displacements. The responses of the columns have been analyzed and compared in terms of failure modes and strength and deformation capacity. Particular attention has been focused on the strain distribution recorded on the CFRP strips used to confine the RC column end; the strain profiles along the cross-section perimeter in case of axial load and bending moment interaction are presented and discussed at different load levels. In the second part of the study, the deformation capacity of FRP confined RC column is analytically obtained, by using models for FRP confined square columns available in literature. The comparison between analytical and experimental results showed that currently available models give conservative predictions of ultimate deformation capacity of confined columns.

000021540 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021540 653__ $$aconfinement, CFRP, RC columns, ductility, deformation capacity.

000021540 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021540 720__ $$aZoppo, Marta Del$$iProta, Andrea$$iBalsamo, Alberto$$iLudovico, Marco Di
000021540 8560_ $$ffischerc@itam.cas.cz
000021540 8564_ $$s762144$$uhttps://invenio.itam.cas.cz/record/21540/files/16923.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS29] Repair and Retrofit of Structures
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000021540 962__ $$r21500
000021540 980__ $$aPAPER