Bending strength of CFRP-strengthened circular hollow steel sections

J. Haedir, M. R. Bambach, Xiao Lin Zhao, R. Grzebieta

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


Circular hollow sections (CHS) have been widely employed in structural and energy absorbing applications. Due to greater strength and ductility requirements, it may result in very thin-walled steel sections that are susceptible to local buckling. The use of new materials in the form of carbon fibre reinforced polymer (CFRP) sheets has been increasingly applied with great advantage in strengthening of existing structures today. Furthermore, CFRP may also be applied to minimise the effects of local buckling of thin-walled steel tubes. There are limited international design guidelines that cater for the use of FRP in steel structures, and hence research is needed to provide engineers with a design method to use this new material with safety and cost efficiency. This paper presents an experimental study to assess the influence of slenderness on the bending strength of thin-walled CHS steel tubes strengthened with CFRP for use in design. The effects of fibre orientations are also examined by having both longitudinal and hoop wrappings of steel tubes. It has been proved that by using CFRP in both the longitudinal and hoop orientations enhanced the capacity of slender sections to behave as compact or non-compact sections. The study shows that greater strength and ductility can be achieved in thin-walled circular steel tubes strengthened with CFRP, thus the use of this innovative material have potential for cost efficient design and in retrofitting steel structures for strength and seismic enhancement.

Original languageEnglish
Title of host publicationComposites in Civil Engineering, CICE 2006
EditorsAmir Mirmiran, Antonio Nanni
PublisherInternational Institute for FRP in Construction (IIFC)
Number of pages4
ISBN (Electronic)0615135862, 9780615135861
Publication statusPublished - 2020
Externally publishedYes
Event3rd International Conference on Composites in Civil Engineering, CICE 2006 - Miami, United States
Duration: 13 Dec 200615 Dec 2006

Publication series

NameComposites in Civil Engineering, CICE 2006


Conference3rd International Conference on Composites in Civil Engineering, CICE 2006
Country/TerritoryUnited States


  • Bending
  • Carbon fibre reinforced polymer
  • Local buckling
  • Steel tubes
  • Thin-walled steel sections

ASJC Scopus subject areas

  • Surfaces and Interfaces


Dive into the research topics of 'Bending strength of CFRP-strengthened circular hollow steel sections'. Together they form a unique fingerprint.

Cite this