Stability of steel columns with bolted strengthening under preload: An analytical model

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  • Tongji University
  • Eidgenössische Materialprüfungs- und Forschungsanstalt (EMPA)
  • Shanghai Engineering Research Center of High Performance Composite Bridges
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OriginalspracheEnglisch
Aufsatznummer107699
FachzeitschriftJournal of Constructional Steel Research
Jahrgang201
Frühes Online-Datum28 Nov. 2022
PublikationsstatusVeröffentlicht - Feb. 2023

Abstract

The stability of steel columns strengthened using bolted components under a preload (the existing load during the strengthening process) is studied. An analytical model that considers the effects of the preload and bolting is proposed. The preload effect is expressed as the combined effect of equivalent initial deformation and stresses, based on which a preload-effect factor is derived. The adverse effect of bolt holes on the column stability is considered, and a bolting factor is derived based on interpolation and stress integral. A prediction formula, containing the preload-effect factor and bolting factor, for the ultimate load capacity of strengthened steel columns, is obtained. The proposed formula and the formulas in the current standards are evaluated against existing numerical and experimental results. The proposed formula is validated to be capable of providing accurate predictions, with a mean absolute percentage error of approximately 10%.

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Stability of steel columns with bolted strengthening under preload: An analytical model. / Wang, Sizhe; Su, Qingtian; Jiang, Xu et al.
in: Journal of Constructional Steel Research, Jahrgang 201, 107699, 02.2023.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Wang S, Su Q, Jiang X, Ghafoori E. Stability of steel columns with bolted strengthening under preload: An analytical model. Journal of Constructional Steel Research. 2023 Feb;201:107699. Epub 2022 Nov 28. doi: 10.1016/j.jcsr.2022.107699
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abstract = "The stability of steel columns strengthened using bolted components under a preload (the existing load during the strengthening process) is studied. An analytical model that considers the effects of the preload and bolting is proposed. The preload effect is expressed as the combined effect of equivalent initial deformation and stresses, based on which a preload-effect factor is derived. The adverse effect of bolt holes on the column stability is considered, and a bolting factor is derived based on interpolation and stress integral. A prediction formula, containing the preload-effect factor and bolting factor, for the ultimate load capacity of strengthened steel columns, is obtained. The proposed formula and the formulas in the current standards are evaluated against existing numerical and experimental results. The proposed formula is validated to be capable of providing accurate predictions, with a mean absolute percentage error of approximately 10%.",
keywords = "Bolting, Buckling, Preload, Steel column, Strengthening, Ultimate load capacity",
author = "Sizhe Wang and Qingtian Su and Xu Jiang and Elyas Ghafoori",
note = "Funding Information: This work was supported by the Key Research Project of Guangdong Province of China (No. 2019B111106002 ), Shanghai Engineering Research Center of High Performance Composite Bridges (No. 19DZ2254200 ), Natural Science Foundation of Shanghai (No. 21ZR1466100 ), and Zhejiang Province science and technology plan project ( 2019017 ). The first author acknowledges the support of the China Scholarship Council (CSC). ",
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T2 - An analytical model

AU - Wang, Sizhe

AU - Su, Qingtian

AU - Jiang, Xu

AU - Ghafoori, Elyas

N1 - Funding Information: This work was supported by the Key Research Project of Guangdong Province of China (No. 2019B111106002 ), Shanghai Engineering Research Center of High Performance Composite Bridges (No. 19DZ2254200 ), Natural Science Foundation of Shanghai (No. 21ZR1466100 ), and Zhejiang Province science and technology plan project ( 2019017 ). The first author acknowledges the support of the China Scholarship Council (CSC).

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Y1 - 2023/2

N2 - The stability of steel columns strengthened using bolted components under a preload (the existing load during the strengthening process) is studied. An analytical model that considers the effects of the preload and bolting is proposed. The preload effect is expressed as the combined effect of equivalent initial deformation and stresses, based on which a preload-effect factor is derived. The adverse effect of bolt holes on the column stability is considered, and a bolting factor is derived based on interpolation and stress integral. A prediction formula, containing the preload-effect factor and bolting factor, for the ultimate load capacity of strengthened steel columns, is obtained. The proposed formula and the formulas in the current standards are evaluated against existing numerical and experimental results. The proposed formula is validated to be capable of providing accurate predictions, with a mean absolute percentage error of approximately 10%.

AB - The stability of steel columns strengthened using bolted components under a preload (the existing load during the strengthening process) is studied. An analytical model that considers the effects of the preload and bolting is proposed. The preload effect is expressed as the combined effect of equivalent initial deformation and stresses, based on which a preload-effect factor is derived. The adverse effect of bolt holes on the column stability is considered, and a bolting factor is derived based on interpolation and stress integral. A prediction formula, containing the preload-effect factor and bolting factor, for the ultimate load capacity of strengthened steel columns, is obtained. The proposed formula and the formulas in the current standards are evaluated against existing numerical and experimental results. The proposed formula is validated to be capable of providing accurate predictions, with a mean absolute percentage error of approximately 10%.

KW - Bolting

KW - Buckling

KW - Preload

KW - Steel column

KW - Strengthening

KW - Ultimate load capacity

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VL - 201

JO - Journal of Constructional Steel Research

JF - Journal of Constructional Steel Research

SN - 0143-974X

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