Steel and Composite Structures

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Experimental and numerical study about seismic retrofitting of corrosion-damaged reinforced concrete columns of bridge using combination of FRP wrapping and steel profiles

  • Afshin, Hassan (Department of Civil Engineering, Sahand University of Technology) ;
  • Shirazi, Mohammad R. Nouri (Department of Civil Engineering, Sahand University of Technology) ;
  • Abedi, Karim (Department of Civil Engineering, Sahand University of Technology)
  • Received : 2018.04.17
  • Accepted : 2019.01.31
  • Published : 2019.02.10
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Abstract

In the present study, a numerical and experimental investigation has been carried out on the seismic behavior of RC columns of a bridge which damaged under corrosive environments and retrofitted by various techniques including combined application of CFRP sheets and steel profiles. A novel hybrid retrofitting procedure, including the application of inner steel profiles and outer peripheral CFRP sheets, has been proposed for strengthening purpose. Seven large-scale RC columns of a Girder Bridge have been tested in the laboratory under the influence of simultaneous application of constant axial load and the lateral cyclic displacements. Having verified the finite element modeling, using ABAQUS software, the effects of important parameters such as the corrosion percentage of steel rebars and the number of CFRP layers have been evaluated. Based on the results, retrofitting of RC columns of the bridge with the proposed technique was effective in improving some measures of structural performance such as lateral strength degradation and higher energy absorption capability. However, the displacement ductility was not considerably improved whereas the elastic stiffness of the specimens has been increased.

Keywords

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