Details
| Original language | English |
|---|---|
| Article number | 107119 |
| Journal | Journal of Constructional Steel Research |
| Volume | 190 |
| Early online date | 5 Jan 2022 |
| Publication status | Published - Mar 2022 |
| Externally published | Yes |
Abstract
Strengthening of steel columns is usually conducted with existing loads, so there is a need to study the effect of the preload (the existing load during strengthening) on the stability of strengthened columns. This study presents an experimental work, in which H-shaped steel columns were strengthened with bolted steel angles. Specimens strengthened under different preload levels were tested. The test results showed that the preload had an influence on column behaviors including deformations, strains, and stresses. In particular, the preload had an effect on the ultimate load capacity. The (normalized) ultimate load capacities of the specimens slightly increased and then decreased with the increasing preload. The effect of the preload on the ultimate load capacities was generally insignificant (no more than 8% in the study), and the effect could be either favorable or unfavorable depending on the case. This varying effect of the preload could be interpreted by the combined effects of the equivalent initial deformation and initial stresses. In addition, specimens with different steel angle properties, strengthening length ratios, and slenderness ratios were tested. The test results indicated that all these variables affected the behaviors and ultimate load capacities of the strengthened specimens.
Keywords
- Bolting, Buckling, Compression test, Preload, Stability, Strengthening
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Engineering(all)
- Mechanics of Materials
- Materials Science(all)
- Metals and Alloys
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In: Journal of Constructional Steel Research, Vol. 190, 107119, 03.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Stability of steel columns with bolted strengthening under preload
T2 - Experimental study
AU - Wang, Sizhe
AU - Su, Qingtian
AU - Jiang, Xu
AU - Ghafoori, Elyas
N1 - Funding Information: This work was supported by the Shanghai Engineering Research Center of High Performance Composite Bridges [No. 19DZ2254200 ], Key Research Project of Guangdong Province of China [No.2019B111106002], the Natural Science Foundation of Shanghai [Grant No. 21ZR1466100], and the Fundamental Research Funds for the Central Universities of China. The first author also acknowledges the support of the China Scholarship Council (CSC). Publisher Copyright: © 2021
PY - 2022/3
Y1 - 2022/3
N2 - Strengthening of steel columns is usually conducted with existing loads, so there is a need to study the effect of the preload (the existing load during strengthening) on the stability of strengthened columns. This study presents an experimental work, in which H-shaped steel columns were strengthened with bolted steel angles. Specimens strengthened under different preload levels were tested. The test results showed that the preload had an influence on column behaviors including deformations, strains, and stresses. In particular, the preload had an effect on the ultimate load capacity. The (normalized) ultimate load capacities of the specimens slightly increased and then decreased with the increasing preload. The effect of the preload on the ultimate load capacities was generally insignificant (no more than 8% in the study), and the effect could be either favorable or unfavorable depending on the case. This varying effect of the preload could be interpreted by the combined effects of the equivalent initial deformation and initial stresses. In addition, specimens with different steel angle properties, strengthening length ratios, and slenderness ratios were tested. The test results indicated that all these variables affected the behaviors and ultimate load capacities of the strengthened specimens.
AB - Strengthening of steel columns is usually conducted with existing loads, so there is a need to study the effect of the preload (the existing load during strengthening) on the stability of strengthened columns. This study presents an experimental work, in which H-shaped steel columns were strengthened with bolted steel angles. Specimens strengthened under different preload levels were tested. The test results showed that the preload had an influence on column behaviors including deformations, strains, and stresses. In particular, the preload had an effect on the ultimate load capacity. The (normalized) ultimate load capacities of the specimens slightly increased and then decreased with the increasing preload. The effect of the preload on the ultimate load capacities was generally insignificant (no more than 8% in the study), and the effect could be either favorable or unfavorable depending on the case. This varying effect of the preload could be interpreted by the combined effects of the equivalent initial deformation and initial stresses. In addition, specimens with different steel angle properties, strengthening length ratios, and slenderness ratios were tested. The test results indicated that all these variables affected the behaviors and ultimate load capacities of the strengthened specimens.
KW - Bolting
KW - Buckling
KW - Compression test
KW - Preload
KW - Stability
KW - Strengthening
UR - http://www.scopus.com/inward/record.url?scp=85123195338&partnerID=8YFLogxK
U2 - 10.1016/j.jcsr.2021.107119
DO - 10.1016/j.jcsr.2021.107119
M3 - Article
AN - SCOPUS:85123195338
VL - 190
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
SN - 0143-974X
M1 - 107119
ER -