Steel and Composite Structures

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Rehabilitation of corroded circular hollow sectional steel beam by CFRP patch

  • Setvati, Mahdi Razavi (Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS) ;
  • Mustaffa, Zahiraniza (Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS)
  • Received : 2018.12.09
  • Accepted : 2019.05.31
  • Published : 2019.07.10
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Abstract

Bridges, offshore oil platforms and other infrastructures usually require at some point in their service life rehabilitation for reasons such as aging and corrosion. This study explores the application of adhesively bonded CFRP patches in repair of corroded circular hollow sectional (CHS) steel beams. An experimental program involving three-point bending tests was conducted on intact, corroded, and repaired CHS beams. Meso-scale finite element (FE) models of the tested beams were developed and validated by the experimental results. A parametric study using the validated FE models was performed to examine the effects of different CFRP patch parameters, including patch dimensions, number of plies and stacking sequence, on efficiency of the repair system. Results indicates that the corrosion reduced elastic stiffness and flexural strength of the undamaged beam by 8.9 and 15.1%, respectively, and composite repair recovered 10.7 and 18.9% of those, respectively, compared to undamaged beam. These findings demonstrated the ability of CFRP patch repair to restore full bending capacity of the corroded CHS steel beam. The parametric study revealed that strength and stiffness of the repaired CHS beam can be enhanced by changing the fiber orientations of wet composite patch without increasing the quantity of repair materials.

Keywords

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