Strengthening of circular hollow steel tubular sections using high modulus CFRP sheets

This paper describes the behaviour of very high strength (VHS) circular steel tubes strengthened by carbon fibre reinforced polymer (CFRP) and subjected to axial tension. A series of tests were conducted with different bond lengths and number of layers. The distribution of strain through the thickne...

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Bibliographic Details
Published in:Construction & building materials 2007-04, Vol.21 (4), p.839-845
Main Authors: Fawzia, S., Al-Mahaidi, R., Zhao, X.L., Rizkalla, S.
Format: Article
Language:English
Subjects:
Adhesive
Bond
Carbon fiber reinforced polymer
Evaluation
Reinforced concrete
Shear strength of soils
Steel, Structural
Strengthening steel tube
VHS (very high strength) steel tubes
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Summary:This paper describes the behaviour of very high strength (VHS) circular steel tubes strengthened by carbon fibre reinforced polymer (CFRP) and subjected to axial tension. A series of tests were conducted with different bond lengths and number of layers. The distribution of strain through the thickness of CFRP layers and along the CFRP bond length was studied. The strain was found to generally decrease along the CFRP bond length far from the joint. The strain through the thickness of the CFRP layers was also found to decrease from the bottom to top layer. The effective bond length for high modulus CFRP was established. Finally empirical models were developed to estimate the maximum load for a given CFRP arrangement.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2006.06.014