Details
| Original language | English |
|---|---|
| Pages (from-to) | 194-206 |
| Number of pages | 13 |
| Journal | Construction and Building Materials |
| Volume | 76 |
| Early online date | 13 Dec 2014 |
| Publication status | Published - 1 Feb 2015 |
| Externally published | Yes |
Abstract
Lateral-torsional buckling (LTB) of steel beams that are strengthened by normal modulus (NM) carbon fibre-reinforced polymer (CFRP) laminates was studied experimentally and numerically. A total of seven steel beams, which included a reference unstrengthened beam, were tested statically until failure. The steel beams were strengthened by bonded and un-bonded CFRP laminates. For each type, three steel beams that were strengthened by CFRP laminates with 0%, 20% and 40% pre-stress levels were prepared and tested. The effects of various strengthening schemes on the linear elastic behaviour, as well as the buckling strength of the retrofitted beams, were investigated. The test results showed that retrofitting the steel beams using CFRP laminates increases the elastic stiffness of the specimens almost the same for both bonded and un-bonded systems compared to the reference beam. The pre-stressing of CFRP laminate has no effect on the elastic stiffness of the retrofitted beams but substantially influences the buckling strength. Higher pre-stress levels do not necessarily lead to an increased buckling strength in the retrofitted beams. In most of the tests, the specimens that were strengthened with the un-bonded CFRP laminate showed slightly higher strength than the specimens that were strengthened by bonded CFRP laminate. Preparation of the bonded specimens took approximately twice as long as that of the un-bonded specimens. Finite element (FE) models of the retrofitted beams with pre-stressed bonded and un-bonded laminates were created. The results from the FE analysis were compared with the results obtained from the experiments.
Keywords
- Carbon fibre-reinforced polymer (CFRP), Lateral-torsional buckling (LTB), Metallic beams, Pre-stress, Retrofitting, Un-bonded and bonded strengthening
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Materials Science(all)
- General Materials Science
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In: Construction and Building Materials, Vol. 76, 01.02.2015, p. 194-206.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Lateral-torsional buckling of steel I-beams retrofitted by bonded and un-bonded CFRP laminates with different pre-stress levels
T2 - Experimental and numerical study
AU - Ghafoori, Elyas
AU - Motavalli, Masoud
PY - 2015/2/1
Y1 - 2015/2/1
N2 - Lateral-torsional buckling (LTB) of steel beams that are strengthened by normal modulus (NM) carbon fibre-reinforced polymer (CFRP) laminates was studied experimentally and numerically. A total of seven steel beams, which included a reference unstrengthened beam, were tested statically until failure. The steel beams were strengthened by bonded and un-bonded CFRP laminates. For each type, three steel beams that were strengthened by CFRP laminates with 0%, 20% and 40% pre-stress levels were prepared and tested. The effects of various strengthening schemes on the linear elastic behaviour, as well as the buckling strength of the retrofitted beams, were investigated. The test results showed that retrofitting the steel beams using CFRP laminates increases the elastic stiffness of the specimens almost the same for both bonded and un-bonded systems compared to the reference beam. The pre-stressing of CFRP laminate has no effect on the elastic stiffness of the retrofitted beams but substantially influences the buckling strength. Higher pre-stress levels do not necessarily lead to an increased buckling strength in the retrofitted beams. In most of the tests, the specimens that were strengthened with the un-bonded CFRP laminate showed slightly higher strength than the specimens that were strengthened by bonded CFRP laminate. Preparation of the bonded specimens took approximately twice as long as that of the un-bonded specimens. Finite element (FE) models of the retrofitted beams with pre-stressed bonded and un-bonded laminates were created. The results from the FE analysis were compared with the results obtained from the experiments.
AB - Lateral-torsional buckling (LTB) of steel beams that are strengthened by normal modulus (NM) carbon fibre-reinforced polymer (CFRP) laminates was studied experimentally and numerically. A total of seven steel beams, which included a reference unstrengthened beam, were tested statically until failure. The steel beams were strengthened by bonded and un-bonded CFRP laminates. For each type, three steel beams that were strengthened by CFRP laminates with 0%, 20% and 40% pre-stress levels were prepared and tested. The effects of various strengthening schemes on the linear elastic behaviour, as well as the buckling strength of the retrofitted beams, were investigated. The test results showed that retrofitting the steel beams using CFRP laminates increases the elastic stiffness of the specimens almost the same for both bonded and un-bonded systems compared to the reference beam. The pre-stressing of CFRP laminate has no effect on the elastic stiffness of the retrofitted beams but substantially influences the buckling strength. Higher pre-stress levels do not necessarily lead to an increased buckling strength in the retrofitted beams. In most of the tests, the specimens that were strengthened with the un-bonded CFRP laminate showed slightly higher strength than the specimens that were strengthened by bonded CFRP laminate. Preparation of the bonded specimens took approximately twice as long as that of the un-bonded specimens. Finite element (FE) models of the retrofitted beams with pre-stressed bonded and un-bonded laminates were created. The results from the FE analysis were compared with the results obtained from the experiments.
KW - Carbon fibre-reinforced polymer (CFRP)
KW - Lateral-torsional buckling (LTB)
KW - Metallic beams
KW - Pre-stress
KW - Retrofitting
KW - Un-bonded and bonded strengthening
UR - http://www.scopus.com/inward/record.url?scp=84918515374&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2014.11.070
DO - 10.1016/j.conbuildmat.2014.11.070
M3 - Article
AN - SCOPUS:84918515374
VL - 76
SP - 194
EP - 206
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -