Details
| Original language | English |
|---|---|
| Article number | 107440 |
| Journal | Journal of Constructional Steel Research |
| Volume | 197 |
| Publication status | Published - Oct 2022 |
| Externally published | Yes |
Abstract
Steel structures are often strengthened under a preload, which is defined as the existing load on the structure during the strengthening process. This study aims to understand the preload effect on the stability of strengthened steel columns. A numerical study on steel columns strengthened by bolted steel profiles under a preload is presented. Finite element (FE) models are developed and verified using experimental results. Furthermore, a parametric study is conducted with 242 FE models on parameters, including the preload, strengthened section properties, column length, and bolt configuration. The numerical results indicate that the preload effect on the ultimate load capacity can be beneficial, negligible, or adverse, ranging from −17% to 8%. The preload effect is found to be dependent on the preload level, section geometry, steel properties, and column length. Subsequently, a prediction model is proposed, wherein the preload effect is expressed as a function of the preload level and normalized slenderness. The prediction model is validated by existing experimental results and found capable of providing practically accurate predictions.
Keywords
- Bolting, Buckling, Finite element method, 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. 197, 107440, 10.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Stability of steel columns strengthened under preload
T2 - Numerical study with experimental validation
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 [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: © 2022 Elsevier Ltd
PY - 2022/10
Y1 - 2022/10
N2 - Steel structures are often strengthened under a preload, which is defined as the existing load on the structure during the strengthening process. This study aims to understand the preload effect on the stability of strengthened steel columns. A numerical study on steel columns strengthened by bolted steel profiles under a preload is presented. Finite element (FE) models are developed and verified using experimental results. Furthermore, a parametric study is conducted with 242 FE models on parameters, including the preload, strengthened section properties, column length, and bolt configuration. The numerical results indicate that the preload effect on the ultimate load capacity can be beneficial, negligible, or adverse, ranging from −17% to 8%. The preload effect is found to be dependent on the preload level, section geometry, steel properties, and column length. Subsequently, a prediction model is proposed, wherein the preload effect is expressed as a function of the preload level and normalized slenderness. The prediction model is validated by existing experimental results and found capable of providing practically accurate predictions.
AB - Steel structures are often strengthened under a preload, which is defined as the existing load on the structure during the strengthening process. This study aims to understand the preload effect on the stability of strengthened steel columns. A numerical study on steel columns strengthened by bolted steel profiles under a preload is presented. Finite element (FE) models are developed and verified using experimental results. Furthermore, a parametric study is conducted with 242 FE models on parameters, including the preload, strengthened section properties, column length, and bolt configuration. The numerical results indicate that the preload effect on the ultimate load capacity can be beneficial, negligible, or adverse, ranging from −17% to 8%. The preload effect is found to be dependent on the preload level, section geometry, steel properties, and column length. Subsequently, a prediction model is proposed, wherein the preload effect is expressed as a function of the preload level and normalized slenderness. The prediction model is validated by existing experimental results and found capable of providing practically accurate predictions.
KW - Bolting
KW - Buckling
KW - Finite element method
KW - Preload
KW - Stability
KW - Strengthening
UR - http://www.scopus.com/inward/record.url?scp=85135838458&partnerID=8YFLogxK
U2 - 10.1016/j.jcsr.2022.107440
DO - 10.1016/j.jcsr.2022.107440
M3 - Article
AN - SCOPUS:85135838458
VL - 197
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
SN - 0143-974X
M1 - 107440
ER -