Abstract
This paper presents a design method (BS5950-5) to predict the allowable load carrying capacity of cold formed steel channel section strengthened by carbon fiber reformed polymer composites applied to the web of the beam. A specimen is presented to illustrate the proposed design approach. The validity of the proposed design method has been verified by comparing with the experimental test results. A series of compression tests were conducted on plain and CFRP strengthened steel sections of different geometries. This paper also contains the consequences obtained by comparing the strengths of plain and CFRP strengthened steel columns using compression test. The findings showed that the strength of CFRP strengthened steel columns were up to 10% greater than plain cold form steel sections. Keywords: CFRP, CFRP Strengthening, Axial Compression, Cold Formed Steel.
Highlights
The use of carbon fiber reinforced polymers (CFRP) in strengthening structural members is rapidly gaining in past two decades
Several studies have been conducted on the use of CFRP sheets, like non-linear behavior and load carrying capacity of CFRP strengthened lipped channel steel [1,2], web crippling [3], tubular beams and columns
[4,5], Axial capacity and design of SHS steel section strengthened with CFRP [6], web buckling [7]
Summary
The use of carbon fiber reinforced polymers (CFRP) in strengthening structural members is rapidly gaining in past two decades. Several studies have been conducted on the use of CFRP sheets, like non-linear behavior and load carrying capacity of CFRP strengthened lipped channel steel [1,2], web crippling [3], tubular beams and columns [4,5], Axial capacity and design of SHS steel section strengthened with CFRP [6], web buckling [7]. Proper installation of CFRP is essential in ensuring bonding between CFRP materials and metallic structures. In previous papers [8,9,10,11,12], the authors showed significant strength enhancement of CFRP strengthened steel plate by investigating bond characteristics between CFRP laminate and steel by experimental, theoretical and finite element analysis. All investigations showed a considerable increase in ultimate load carrying capacity from 10 to 20% with a good energy absorption capability
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