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. |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 15417794 |
| DOI: | 10.1002/tal.70045 |
