Symmetric and antisymmetric lateral–torsional buckling of prestressed steel I-beams
| Autor: | Wen-Fu Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
business.industry Antisymmetric relation Mechanical Engineering media_common.quotation_subject 020101 civil engineering 02 engineering and technology Building and Construction Structural engineering Physics::Classical Physics Potential energy 0201 civil engineering Strain energy 020303 mechanical engineering & transports 0203 mechanical engineering Buckling Boundary value problem Eccentricity (behavior) business Differential (mathematics) Civil and Structural Engineering media_common Dimensionless quantity |
| Zdroj: | Thin-Walled Structures. 122:463-479 |
| ISSN: | 0263-8231 |
| DOI: | 10.1016/j.tws.2017.10.015 |
| Popis: | Until now, there are no analytical solutions published of the lateral-torsional buckling (LTB) of the prestressed steel I-beams. In this paper, the symmetric and antisymmetric elastic LTB buckling performance of prestressed steel I-beams, with rectilinear tendons, under equal end moments has been examined. Firstly, a simplified mechanical model is put forward. Secondly, based upon the Euler-Beam model & the Kirchhoff-Plate model, the strain energy equation as well as the potential energy of the prestressed steel I-beam are derived in detail. Then the total potential equation and the differential equilibrium equations along with the boundary conditions are obtained. As a result, the analytical solutions of the symmetric and antisymmetric elastic LTB of prestressed I-beams are obtained, for the first time, and the correctness of the analytical solution of the critical moment of the symmetric buckling of the prestressed I-beam is verified by those simulated by using ANSYS. Finally, parameter analysis is carried out. It is found that: (1) the critical moment of the prestressed steel I-beam, with rectilinear tendons, under equal end moments can be determined by that of the symmetric buckling; (2) the critical prestressing force can be determined by that of the symmetric buckling or antisymmetric buckling depending on the relationship between the dimensionless eccentricity and its threshold value. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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