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Thermomechanical Buckling and Postbuckling of Steel Trusses With Initial Load and Length Imperfection.

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Title: Thermomechanical Buckling and Postbuckling of Steel Trusses With Initial Load and Length Imperfection.
Authors: Dao, Ngoc Tien1 (AUTHOR), Chu, Thi Hoang Anh1 (AUTHOR) anhcth@hau.edu.vn, Chu, Thi Binh1 (AUTHOR), Nguyen, Ha1 (AUTHOR), Pham, Van Dat1 (AUTHOR), Cuong‐Le, Thanh2 (AUTHOR)
Source: Structural Design of Tall & Special Buildings. 6/25/2025, Vol. 34 Issue 9, p1-28. 28p.
Subjects: Mechanical loads, Critical temperature, High temperatures, Trusses, Analytical solutions
Abstract: This study conducts a comprehensive investigation into the buckling and postbuckling behaviors of steel trusses subjected to thermomechanical loading, incorporating initial imperfections in both load and bar length. A thermomechanical model for space truss elements is proposed, accounting for geometric and material nonlinearities as well as the softening behavior of steel at elevated temperatures. Material degradation is characterized through coefficients provided by Eurocode 3 (EC3), while imperfections in bar lengths are parameterized within the stress–strain relationship for both elastic and elastoplastic models. Imperfect loading conditions are integrated into the equilibrium equations through an imperfect loading vector. The study presents key results in the form of "load–displacement" and "critical load–critical temperature" curves, developed for elastic materials, elastoplastic materials, and scenarios with imperfect loading. A parametric analysis explores the influence of load and bar length imperfections on the contraction of the stable region and expansion of the unstable region. Validation is performed by comparing the outcomes with existing analytical and numerical solutions. Furthermore, this research introduces a novel methodology for assessing the overall stability of steel trusses subjected to imperfect thermomechanical loads, with applications in both stability analysis and truss design. By providing insights into stable and unstable regions, the findings contribute to advancing engineering practices in analyzing and designing truss systems under complex loading conditions. [ABSTRACT FROM AUTHOR]
Copyright of Structural Design of Tall & Special Buildings is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 186163617
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Items – Name: Title
  Label: Title
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  Data: Thermomechanical Buckling and Postbuckling of Steel Trusses With Initial Load and Length Imperfection.
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  Data: <searchLink fieldCode="AR" term="%22Dao%2C+Ngoc Tien%22">Dao, Ngoc Tien</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chu%2C+Thi Hoang Anh%22">Chu, Thi Hoang Anh</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> anhcth@hau.edu.vn</i><br /><searchLink fieldCode="AR" term="%22Chu%2C+Thi Binh%22">Chu, Thi Binh</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nguyen%2C+Ha%22">Nguyen, Ha</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pham%2C+Van Dat%22">Pham, Van Dat</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cuong‐Le%2C+Thanh%22">Cuong‐Le, Thanh</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Structural+Design+of+Tall+%26+Special+Buildings%22">Structural Design of Tall & Special Buildings</searchLink>. 6/25/2025, Vol. 34 Issue 9, p1-28. 28p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Mechanical+loads%22">Mechanical loads</searchLink><br /><searchLink fieldCode="DE" term="%22Critical+temperature%22">Critical temperature</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Trusses%22">Trusses</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+solutions%22">Analytical solutions</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study conducts a comprehensive investigation into the buckling and postbuckling behaviors of steel trusses subjected to thermomechanical loading, incorporating initial imperfections in both load and bar length. A thermomechanical model for space truss elements is proposed, accounting for geometric and material nonlinearities as well as the softening behavior of steel at elevated temperatures. Material degradation is characterized through coefficients provided by Eurocode 3 (EC3), while imperfections in bar lengths are parameterized within the stress–strain relationship for both elastic and elastoplastic models. Imperfect loading conditions are integrated into the equilibrium equations through an imperfect loading vector. The study presents key results in the form of "load–displacement" and "critical load–critical temperature" curves, developed for elastic materials, elastoplastic materials, and scenarios with imperfect loading. A parametric analysis explores the influence of load and bar length imperfections on the contraction of the stable region and expansion of the unstable region. Validation is performed by comparing the outcomes with existing analytical and numerical solutions. Furthermore, this research introduces a novel methodology for assessing the overall stability of steel trusses subjected to imperfect thermomechanical loads, with applications in both stability analysis and truss design. By providing insights into stable and unstable regions, the findings contribute to advancing engineering practices in analyzing and designing truss systems under complex loading conditions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Structural Design of Tall & Special Buildings is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/tal.70045
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      – Code: eng
        Text: English
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        PageCount: 28
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      – SubjectFull: Mechanical loads
        Type: general
      – SubjectFull: Critical temperature
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      – SubjectFull: High temperatures
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      – SubjectFull: Analytical solutions
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      – TitleFull: Thermomechanical Buckling and Postbuckling of Steel Trusses With Initial Load and Length Imperfection.
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            NameFull: Dao, Ngoc Tien
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            NameFull: Chu, Thi Hoang Anh
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            NameFull: Nguyen, Ha
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            NameFull: Pham, Van Dat
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            – D: 25
              M: 06
              Text: 6/25/2025
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              Y: 2025
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