Experimental Study of Rectangular RC Columns Strengthened with CFRP Composites under Eccentric Loading

Sadeghian, Pedram; Rahai, Alireza; Ehsani, Mohammad Reza

doi:10.1061/(asce)cc.1943-5614.0000100

Cited by 81 publications

(40 citation statements)

References 11 publications

(3 reference statements)

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“…Sadeghian, et al (2010) conducted a research on experimental study of rectangular RC columns strengthened with CFRP composites under eccentric loading where the ultimate capacity load increased significantly compare to the original column. Kaminski & Trapko (2005) conducted a research on retrofitting of column with CFRP where the capacity increased up to 37% and 49% compare to the original column.…”

Section: Repairing and Strengthening Of Reinforced Concretementioning

confidence: 99%

Retrofitting on Flexural Strength of Rc Columns Using Polyester Resin Concrete

Patah

Saputra

Triwiyono

2016

Journal of the Civil Engineering Forum

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Concrete column structures damages due to flexural moment need to be repaired and strengthened to avoid of sudden failure by applying appropriate methods. The method applied in this study was retrofitting by applying polyester resin concrete. In order to know the effect of polyester resin concrete against axial load capacity, stiffness, ductility and the damage pattern of columns by eccentrically loaded, an experimental laboratory was carried out. In this study, three column specimens are tested. The dimension of the specimen is 150 mm x 150 mm and the high of the column are 1200 mm with the effective high is 600 mm and 600 mm for corbel. The column specimens have a fixed eccentricity of 50 mm. First, initial column tested before yield point of reinforcing bar reached and concrete crack limited to 0,4mm. Further, retrofitting applied to each initial column specimen using normal concrete and polyester resin concrete with the level of resin 15% and 20%, respectively. Retrofitting column tested again with the same loading of initial column until it reaches the collapse load. The result of experiment compares to analysis method by Nawy and Whitney which represent the analysis of normal concrete column capacity. The result showed that levels of resin to be used is 20% because of better workability compared to 15% resin. Further, compressive test on resin concrete cylinder showed that the resin level at 15% and 20% are 82.82 MPa and 76.65 MPa, respectively. The strength of KR-ii decreased about 33.523%. The strength of KR-15ii and KR-20ii increased 5.08% and 24.827% respectively compared to initial column. Specimen column stiffness KR-ii. KR-15ii and KR-20ii decreased about 76.22%, 24.50% and 37.65%, respectively from the initial column. Furthermore, ductility of KR-ii, KR-15ii and KR-20ii decreased about 1.512, 1.250 and 2.50, respectively. The changes of the ultimate capacity load of KR-ii, KR-15ii and KR-20ii by Nawy Method respectively -26.54%, 12.66%, and 13.83%, whereas the method of Whitney respectively -17.68%, 26.25%, and 27.56%. The use of polyester resin concrete can change the pattern of collapse from brittle to ductile columns.

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Section: Repairing and Strengthening Of Reinforced Concretementioning

confidence: 99%

Retrofitting on Flexural Strength of Rc Columns Using Polyester Resin Concrete

Patah

Saputra

Triwiyono

2016

Journal of the Civil Engineering Forum

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“…This produces a nonuniform confining stress due to the strain gradient which in turn reduces the effectiveness of the column [18]. Recently, research has been conducted on the eccentric axially loaded columns retrofitted with FRP sheets [18][19][20][21][22][23][24][25][26][27][28]. Parvin and Wang [18] studied the effects of the jacket thickness and various eccentricities on the CFRP-retrofitted square concrete columns.…”

Section: Strengthening Of Columns Subjected To Eccentric Axial Loadmentioning

confidence: 99%

“…A few larger scale tests have also been performed on eccentrically loaded columns [26][27][28]. Large-scale rectangular RC columns with 0°, 45°, and 90° fiber orientations were tested to obtain their load versus displacement, and moment versus curvature behavior when subjected to eccentric load.…”

Section: Strengthening Of Columns Subjected To Eccentric Axial Loadmentioning

confidence: 99%

“…However, curvature capacity did not increase in this case. For the wrap configuration with angle orientation, in addition to bending stiffness and moment capacity, the curvature capacity also improved [26]. Axial and flexural performance of CFRP-wrapped square RC columns, under various eccentric loadings, was also investigated [27].…”

Section: Strengthening Of Columns Subjected To Eccentric Axial Loadmentioning

confidence: 99%

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FRP Composites Strengthening of Concrete Columns under Various Loading Conditions

2014

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This paper provides a review of some of the progress in the area of fiber reinforced polymers (FRP)-strengthening of columns for several loading scenarios including impact load. The addition of FRP materials to upgrade deficiencies or to strengthen structural components can save lives by preventing collapse, reduce the damage to infrastructure, and the need for their costly replacement. The retrofit with FRP materials with desirable properties provides an excellent replacement for traditional materials, such as steel jacket, to strengthen the reinforced concrete structural members. Existing studies have shown that the use of FRP materials restore or improve the column original design strength for possible axial, shear, or flexure and in some cases allow the structure to carry more load than it was designed for. The paper further concludes that there is a need for additional research for the columns under impact loading senarios. The compiled information prepares the ground work for further evaluation of FRP-strengthening of columns that are deficient in design or are in serious need for repair due to additional load or deterioration.

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“…U-shaped anchors reportedly allowed the flexural FRP to develop higher strains than L-anchor strips. Sadeghian et al (2010) used transverse wrapping to anchor flexural FRP on eccentrically loaded columns. It was observed in this study that transverse wrapping anchorage could not provide confinement to the FRP on the compression face of the column where the FRP tended to debond at strain levels approaching the crushing strain of concrete.…”

Section: Transverse Wrappingmentioning

confidence: 99%

Review of Anchorage Systems for Externally Bonded FRP Laminates

Grelle

Sneed

2013

Int J Concr Struct Mater

181

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The most recent report by ACI Committee 440 on externally bonded fiber reinforced polymer (FRP) strengthening systems states that systems designed to mechanically anchor FRP should be studied in detail and substantiated by physical testing. To select and design an appropriate anchorage system for use in an FRP strengthening system, it is important that findings from previous research studies be known. This paper presents a comprehensive literature review of the performance of different mechanical anchorage systems used in FRP strengthening applications. Each anchorage system is discussed in terms of its purpose and performance. Advantages and disadvantages of each system are discussed, and areas in need of future research are explored.

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Experimental Study of Rectangular RC Columns Strengthened with CFRP Composites under Eccentric Loading

Cited by 81 publications

References 11 publications

Retrofitting on Flexural Strength of Rc Columns Using Polyester Resin Concrete

Retrofitting on Flexural Strength of Rc Columns Using Polyester Resin Concrete

FRP Composites Strengthening of Concrete Columns under Various Loading Conditions

Review of Anchorage Systems for Externally Bonded FRP Laminates

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