TY - CONF
T1 - Experimental evaluation of full-scale FRP-confined reinforced concrete columns
AU - De Luca, A.
AU - Matta, F.
AU - Nanni, A.
AU - Nardone, F.
AU - Lignola, G. P.
AU - Prota, A.
N1 - Funding Information:
The authors gratefully acknowledge the support of the NSF Industry/University Cooperative Research Center for “Repair of Buildings and Bridges with Composites” (RB2C) at the University of Miami, of the “REte dei Laboratori Universitari di Ingegneria Sismica” (RELUIS) at the University of Naples “Federico II”, and of Mapei S.p.A. Special thanks are extended to the Fritz Engineering Laboratory at Lehigh University, in particular to Mr. Frank Stokes and Mr. Gene Matlock, and to the Building and Fire Research Laboratory at the National Institute for Standards and Technology (NIST), in particular to Mr. Steven Cauffman and Mr. Frank Davis, for the assistance in planning and conducting the tests.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
KW - Confinement
KW - Deformability
KW - FRP laminates
KW - Full-scale RC columns
KW - Strengthening
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M3 - Paper
AN - SCOPUS:85077136317
SP - 259
EP - 264
T2 - 2nd Asia-Pacific Conference on FRP in Structures, APFIS 2009
Y2 - 9 December 2009 through 11 December 2009
ER -