Investigation of Bridge Columns Retrofitted with FRP Composites

Document Type : Research Paper

Authors

Abstract

To make a precise investigation of bridge pier strengthened with fibre-reinforced polymer (FRP) composites, two types of pier columns with rectangular and circular cross sections, retrofitted with various methods of composite wreathing, and under different loading conditions were studied using finite element method. Concrete was modeled employing the octal-nodular three-dimensional element with the ability to consider fraction under tension and failure under pressure.In order to model the longitudinal reinforcement, a bi-nodular one axial pressure-tension element was used. Cross bars were arranged as a percentage of volume in concrete element. The FRP composite material was modeled by using layered octal-nodular three-dimensional element. The results of this research demonstrated that with wreathing all around a pier column, the ductility and resistance capacity increases in both types of piers’ cross sections. However, more increase in the measured ductility and strength could be identified in rectangular and circular sections, respectively.

Keywords

References

Alcocer, S. M. and Jirsa, J. O. 1993. "Strength of reinforced concrete frame connections rehabilitated by jacketing". ACI Struct. J. 90(3): 251-261.
ANSYS user’s manual for revision 5.0, Vol. 4. Swanson Analysis Systems Inc.
Chai, Y. H., Priestley, M. J. N. and Seible, F. 1991. "Seismic retrofit of circular bridge columns for enhanced flexural performance". ACI Struct. J. 88(5): 572-584.
Ghobarah, A., Aziz, T. S.  and Biddah, A. 1997. "Rehabilitation of reinforced concrete frame connections using corrugated steel jacketing". ACI Struct. J. 94(3): 282-294.
Hadi, M. N. 2007. "Behaviour of FRP strengthened concrete columns under eccentric compression loading". Compos. Struct. 77(1): 92-96.
Hadi, M. and Widiarsa, I. 2012. "Axial and flexural performance of square RC columns wrapped with CFRP under eccentric loading". J. Compos. Constr. 16(6): p. 640-649.
Katsumata, H., Kobatake, Y. and Takeda, T. 1988. "A study on strengthening with carbon fiber for earthquake-resistant capacity of existing reinforced concrete columns". Proc. 9th Conference on Earthquake Engineering.
Maalej, M., Tanwongsval, S. and Paramasivam, P. 2003. "Modelling of rectangular RC columns strengthened with FRP". Cement and Concrete Comp. 25(2): 263-276.
Mander, J. B., Priestley, M. J. and Park, R. 1988. "Theoretical stress-strain model for confined concrete". J. Struct. Eng. 114(8): 1804-1826.
Mathews, F. L. and Rawlings, R. D. 1999. "Composite Materials: Engineering and Science". Elsevier.
Pantelides, C.P. and Gergely, J. 2002. "Carbon-fiber-reinforced polymer seismic retrofit of RC bridge bent: Design and in situ validation". J. Compos. Constr. 6(1): 52-60.
Parvin, A. and Wang, W. 2001. "Behavior of FRP jacketed concrete columns under eccentric loading". J. Compos. Constr. 5(3): 146-152.
Saadatmanesh, H., Ehsani, M. R. and Li, M. W. 1994. "Strength and ductility of concrete columns externally reinforced with fiber composite straps". ACI Struct. J. 91(4): 434-447.
Song, X., Gu, X., Li, Y. and Zhang, W. 2013. "Mechanical behavior of FRP-strengthened concrete columns subjected to concentric and eccentric compression loading". J. Compos. Constr. 17(3): 336-346.

Files

History

  • Receive Date: 14 June 2014
  • Accept Date: 14 June 2014

Share

How to cite

Statistics