Numerical Analysis on the Influence of the Cross Section of Ultimate Capacity of Reinforced Concrete Columns Reinforced with CFRP

Document Type : Research Note

Authors

1 Assistant Professor, Department of Civil Engineering, Faculty of Technology and the University of Qom, Qom, Iran

2 Department of Civil Engineering, University of Qom, Qom, Iran

Abstract

The most common method of strengthening columns is confining them with FRP composites, which increases their ultimate axial and lateral load capacity. The main objective of this research is to investigate square and rectangular RC columns strengthened with FRP composites. For this purpose, an existing laboratory sample was initially modeled in Abaqus software. As a result, the accuracy of modeling was proven as the laboratory test results and the results generated by the software were compared and showed to be close. Then, with regard to variables such as cross-sectional shape and dimensions of the column and the number of composite layers, 18 analytical samples were determined and modeled in Abaqus software. The samples were divided into two groups of 9: square cross-sections and rectangular cross-sections. Each group included three non-reinforced samples, three samples reinforced with one layer and three samples reinforced with two layers of CFRP. The results obtained from the finite element analysis of these samples showed that the cross-sectional shape of the column did not affect the ultimate axial load capacity, but affected the ultimate lateral load capacity. Also, adding CFRP layers had a profound effect on the ultimate lateral load capacity of the columns and unlike the ultimate axial load capacity, the presence of the second layer of CFRP was very effective. Moreover, as the length-to-width ratio in rectangular samples and the dimensions in square samples increased, the effect of the number of layers on the ultimate axial and lateral load capacity and the energy absorbed by the column decreased.

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References

[1] Pessiki, S. and Harries, K. A. and Kestner, J. T. and Sause, R. and Ricles, J. M. (2001). Axial Behavior of Reinforced Concrete Columns Confined with FRP Jackets. Journal of Composites for Construction, 5 (4), 237-245.
[2] Fardis, M. N. and Khalili, H. (1981). Concrete Encased in Fiberglass-Reinforced-Plastic. Journal of the American Concrete Institute, 78 (6), 440-446.
[3] Maalej, M. and Tanwongsval, S. and Paramasivam, P. (2002). Modelling of Rectangular RC Columns Strengthened with FRP. Cement & Concrete Composites, 25 (2), 263-276.
[4] Soroushnia, S. and Najafi, H. and Mamghani, M. H. and Mehrvand, M. (2016). The Most Complete Practical Reference of ABAQUS. Advanced Level of Civilization. Fourth Edition. Tehran: Negarandedanesh.
[5] Tsai, S. W. and Hahn, H. T. (1980). Introduction to Composite Materials. Pennsylvania: Technomic Publishing Company, Inc.
[6] Hashin, Z. and Rotem, A. (1973). A Fatigue Failure Criterion for Fiber Reinforced Materials. Journal of Composite Materials, 7 (4), 448-464.
[7] Hognestad, E. (1951). A Study of combined bending and Axial load in reinforced concrete members. Urbana-Champaign: University of Illinois.
[8] Saatcioglu, M. and Razvi, S. R. (1992). Strength and ductility of confined concrete. Journal of structural Engineering, 118 (6), 1590-1607.
[9] Dundar, C. and Tokgoz, S. and Tanrikulu, A. K. and Baran, T. (2008). Behaviour of reinforced and concrete-encased composite columns subjected to biaxial bending and axial load. Building and Environment, 43 (6), 1109-1120.       
[10] Permanent Committee for Revising the Iranian Code of Practice for Seismic Resistant Design of Buildings. (2006). Iranian Code of Practice for Seismic Resistant Design of Buildings (Standard No.2800). 3nd.Edition. Tehran: Building & Housing Research Center.
[11] Wu, G. and Wu, Z. S. and Lu, Z. T. (2007). Design-Oriented Stress-Strain Model for Concrete Prisms Confined with FRP Composites. Construction and Building Materials, 21 (5), 1107-1121.
[12] National Building Regulation Office. (2013). Design and implementation of reinforced concrete buildings. Ninth topic. Tehran: Tosseh Iran Publisher. 

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History

  • Receive Date: 03 July 2018
  • Revise Date: 14 October 2018
  • Accept Date: 30 November 2018

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