Experimental evaluation of full-scale FRP-confined reinforced concrete columns

A. De Luca, F. Matta, A. Nanni, F. Nardone, G. P. Lignola, A. Prota

Research output: Contribution to conferencePaperpeer-review


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 RC columns externally confined with glass and basalt-glass FRP laminates, and subjected to pure axial load. The objectives were: to understand the effectiveness of confinement as it relates to the cross-sectional geometry and size; to evaluate the efficiency of corner-bent FRP sheets; to analyze the contribution of internal longitudinal and transverse steel reinforcement; and, to provide much needed and currently unavailable experimental data. Specimens that are representative of full-scale building columns were designed according to dated codes (i.e., prior to 1970) for gravity loads only. In particular, the specimens were designed and constructed using the ACI 318-63 code-mandated minimum amount of longitudinal reinforcement, and minimum area of ties at maximum spacing. The length of the column specimens was 3.05 m. Three series of specimens (S1, S2 and S3) were tested. Series S1 corresponds to a side aspect ratio of 1, series S2 and S3 to a side aspect ratio of about 1.45. The area aspect ratio of series S2 and S3 evaluated with respect to series S1 is, respectively, 1 and 0.5. Each series included a confined specimen and an unconfined (control) counterpart. The discussion of the results includes a comparison with the values obtained using existing analytical models.

Original languageEnglish (US)
Number of pages6
StatePublished - 2009
Event2nd Asia-Pacific Conference on FRP in Structures, APFIS 2009 - Seoul, Korea, Republic of
Duration: Dec 9 2009Dec 11 2009


Conference2nd Asia-Pacific Conference on FRP in Structures, APFIS 2009
Country/TerritoryKorea, Republic of


  • Confinement
  • Deformability
  • FRP laminates
  • Full-scale RC columns
  • Strengthening

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Building and Construction


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