Axial Strength of Rectangular Reinforced Concrete Columns Confined with Carbon Fiber Reinforced Polymer Composites
Author | : Elie Gergi Hantouche |
Publisher | : |
Total Pages | : 134 |
Release | : 2005 |
ISBN-10 | : OCLC:787838858 |
ISBN-13 | : |
Rating | : 4/5 (58 Downloads) |
Book excerpt: Fiber-reinforced polymer (FRP) systems for strengthening concrete structures hav e emerged as an alternative to traditional strengthening techniques, such as ste el plate bonding, section enlargement, and external post-tensioning. FRP strengt hening systems, which involves the use of FRP composite materials as supplementa l externally bonded reinforcement, offer several advantages over traditional str engthening techniques in that they are lightweight, relatively easy to install, and are non-corrosive. Based on several experimental and analytical studies, ACI Committee 440 developed recently recommendations for design and construction of externally bonded FRP Systems for strengthening concrete structures in flexural, shear and compression modes. While design guidelines are currently available f or FRP strengthening of circular column sections, because of the many unknowns a ssociated with the use of FRP for strengthening rectangular column sections, ACI Committee 440 offers no recommendation at present for this type of application. The proposed research deals with experimental investigation of the axial stress -strain response of rectangular concrete columns strengthened with CFRP composit es. Twenty four rectangular specimens is cast and tested to failure under concen tric load to investigate the effect of FRP confinement on the strength enhanceme nt of concrete columns as compared to unconfined columns. The test parameters in clude the aspect ratio of the column cross sections (ranging between 1.0 and abo ut 3.0), number or area of FRP layers (1, 2, and 3 layers) and area of internal transverse and longitudinal steel reinforcement. Based on the result of this inv estigation, the main parameter that influence the response is identified and dis cussed and a general analytical model is developed to predict the ultimate load capacity and stress-strain behavior of the FRP confined columns.