Volumetric Response of FRP-Confined Full-Scale RC Columns


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Title: Volumetric Response of FRP-Confined Full-Scale RC Columns

Author(s): Antonio De Luca, Fabio Nardone, Fabio Matta, Gian Piero Lignola, Andrea Prota, and Antonio Nanni

Publication: Special Publication

Volume: 275


Appears on pages(s): 1-22

Keywords: Confinement, Deformability, FRP laminates, Full-scale RC columns, Strengthening, Volumetric strain.

Date: 3/1/2011

The external confinement of reinforced concrete (RC) columns by means of externally bonded fiber reinforced polymer (FRP) laminates is a well established technique for strengthening and retrofitting purposes. This paper presents a pilot research that includes laboratory testing of full-scale square and rectangular (with side-aspect ratio smaller than 1.5) RC columns externally confined with glass and basalt-glass FRP laminates and subjected to pure axial load. Specimens that are representative of full-scale building columns were designed according to a dated ACI 318 code (i.e., prior to 1970) for gravity loads only. The study was conducted to investigate how the external confinement affects peak axial strength and deformation of a prismatic RC column. The results showed that the FRP confinement increases concrete axial strength, but it is more effective in enhancing concrete strain capacity.