Behavior of hollow steel sections strengthened with CFRP

•Study of short SHS and RHS steel columns strengthened with CFRP.•CFRP delays the elastic local buckling and increases the column axial capacity.•The full strengthening of HSS delays the local buckling occurrence.•The partial strengthening of HSS is significantly affected by spacing between strips.•...

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Bibliographic Details
Published in:Construction & building materials 2019-04, Vol.205, p.306-320
Main Authors: Abu-Sena, Anwar Badawy Badawy, Said, Mohamed, Zaki, M.A., Dokmak, Mohamed
Format: Article
Language:English
Subjects:
Analysis
CFRP
Hollow steel sections (HSS)
Local buckling
Mechanical properties
Polymers
Steel columns
Strength (Materials)
Strengthening
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Summary:•Study of short SHS and RHS steel columns strengthened with CFRP.•CFRP delays the elastic local buckling and increases the column axial capacity.•The full strengthening of HSS delays the local buckling occurrence.•The partial strengthening of HSS is significantly affected by spacing between strips.•Non-linear finite element analyses were performed and assessed with experimental results. Experimental and numerical investigations have been performed on twenty short square and rectangular hollow sections (SHS and RHS) steel columns. The confinement action provided by the CFRP wrapping effectively delays the local buckling of fully strengthened specimens. However, in case of partially strengthened specimens, failure occurs at the non-strengthened zones between CFRP strips. The enhancement in ultimate capacity ranges between 19.1% and 34.5% for SHS, and between 18% and 41.3% for RHS specimens. It has been noticed that, the improvement in the behavior for specimens strengthened with two layer strips is limited compared to specimens strengthened with one layer strips. The finite element results are found to be in good agreement with their experimental counterparts. The reliability index between the finite element and the experimental ultimate capacities ranges between 0.01 and 0.1. An analytical model has been developed to predict the failure load of the control specimens.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2019.01.237