Study of Brick Masonry Columns Confined with CFRP Composite

Fiber-reinforced polymer (FRP) composites are more and more used in the building trade for the set up of reinforcing and repair devices. As known, FRP composites offer higher strength and Young modulus than traditional steel devices, but nowadays technologies are not able to produce pretension of the wrap in civil engineering strengthening applications. Moreover, when confining compressed masonry columns with FRP composites, the effective contribution of the composite cannot be accurately evaluated. In the present paper, some theoretical relationships available in literature are analyzed, regarding the evaluation of confinement effect on wrapped masonry columns. The reliability of these formulations is investigated, comparing the theoretical values with unixial and triaxial experimental test results; unixial tests were carried out both on plain and wrapped brick masonry samples. Experimental results are shown not to fit to the formulas of the literature and the reasons of the discrepancy were searched for...

[1]  Amir Mirmiran,et al.  Tests and modeling of carbon-wrapped concrete columns , 2000 .

[2]  R. Tepfers,et al.  Behavior of concrete cylinders confined by carbon composite 2. Prediction of strength , 2006 .

[3]  Su-Seng Pang,et al.  Repair of damaged RC columns using fast curing FRP composites , 2003 .

[4]  T. Triantafillou,et al.  MASONRY CONFINEMENT WITH FIBER-REINFORCED POLYMERS , 2005 .

[5]  M. Feng,et al.  Stress-strain model for concrete confined by FRP composites , 2007 .

[6]  L. Lorenzis,et al.  Comparative Study of Models on Confinement of Concrete Cylinders with Fiber-Reinforced Polymer Composites , 2003 .

[7]  M. Maalej,et al.  Modelling of rectangular RC columns strengthened with FRP , 2003 .

[8]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

[9]  R. Tepfers,et al.  Behavior of concrete cylinders confined by a carbon composite 3. Deformability and the ultimate axial strain , 2006 .

[10]  J. D. Eshelby.  The determination of the elastic field of an ellipsoidal inclusion, and related problems , 1957, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[11]  Hamid Saadatmanesh,et al.  STRENGTH AND DUCTILITY OF CONCRETE COLUMNS EXTERNALLY REINFORCED WITH FIBER COMPOSITE STRAPS , 1994 .

[12]  H. Toutanji,et al.  BEHAVIOR OF CONCRETE COLUMNS CONFINED WITH FIBER REINFORCED POLYMER TUBES , 1999 .

[13]  Yan Xiao,et al.  Compressive Behavior of Concrete Confined by Carbon Fiber Composite Jackets , 2000 .

[14]  F. E. Richart,et al.  A study of the failure of concrete under combined compressive stresses , 1928 .

[15]  Luciano Feo,et al.  Technical Document CNR-DT 202/2005, Guidelines for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures - Metallic structures. Preliminary study , 2007 .

[16]  M. R. Spoelstra,et al.  FRP-Confined Concrete Model , 2001 .

[17]  M. Corradi,et al.  Confinement of brick masonry columns with CFRP materials , 2007 .

[18]  Sergio Orlando Paciello,et al.  Experimental tests and theoretical models on tuff masonry bricks and columns confined with C-FRP sheets , 2004 .

[19]  Houssam Toutanji,et al.  Strength and durability performance of concrete axially loaded members confined with AFRP composite sheets , 2002 .

[20]  G. Campione,et al.  STRENGTH AND STRAIN CAPACITIES OF CONCRETE COMPRESSION MEMBERS REINFORCED WITH FRP , 2003 .

[21]  Y. H. Zhao,et al.  Effective Elastic Moduli of Ribbon-Reinforced Composites , 1990 .

[22]  F. E. Richart,et al.  Failure of plain and spirally reinforced concrete in compression , 1929 .

[23]  V. Karbhari,et al.  COMPOSITE JACKETED CONCRETE UNDER UNIAXIAL COMPRESSION--VERIFICATION OF SIMPLE DESIGN EQUATIONS , 1997 .

[24]  Stephanie L. Walkup,et al.  Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures (ACI 440.2R-02) , 2005 .

[25]  R. Tepfers,et al.  Behavior of concrete cylinders confined by carbon-composite tapes and prestressed yarns 1. Experimental data , 2006 .

[26]  Amir Mirmiran,et al.  Model of Concrete Confined by Fiber Composites , 1998 .