Finite-element modeling of prestressed cold-formed steel beams
| Autor: | Leroy Gardner, Nicolas Hadjipantelis, M. Ahmer Wadee |
|---|---|
| Přispěvatelé: | Imperial College London |
| Rok vydání: | 2019 |
| Předmět: |
Technology
Engineering Civil Materials science 020101 civil engineering 02 engineering and technology Civil Engineering 0905 Civil Engineering 0201 civil engineering law.invention Engineering 0203 mechanical engineering DESIGN law General Materials Science Civil and Structural Engineering Science & Technology business.industry Mechanical Engineering Stress–strain curve Building and Construction Structural engineering Finite element method Cold-formed steel 020303 mechanical engineering & transports Mechanics of Materials Construction & Building Technology STRESS-STRAIN CURVES BUCKLING TESTS business BEHAVIOR |
| Popis: | The concept and structural benefits of prestressing cold-formed steel beams are explored in the present paper. In the proposed system, prestressing is applied by means of a high-strength steel cable located within the cross section of the beam at an eccentric location with respect to the strong geometric axis. The internal forces generated by the prestressing are opposite in sign to those induced under subsequent vertical loading. Hence, the development of detrimental compressive stresses within the top region of the cold-formed steel beam is delayed and thus the load-carrying capacity of the beam is enhanced. Owing to the precamber that is induced along the member during the prestressing stage, the overall deflections of the beam are also reduced significantly. In the present paper, finite-element (FE) modeling was employed to simulate the mechanical behavior of prestressed cold-formed steel beams during the prestressing and vertical loading stages. Following the validation of the FE modeling approach, a set of parametric studies was conducted, where the influence of the key controlling parameters on the structural benefits obtained from the prestressing process was investigated. The parametric results were utilized to determine how the benefits obtained from the addition of the prestressed cable can be maximized, demonstrating the significant enhancements in the performance of the cold-formed steel beam that can be achieved. |
| Databáze: | OpenAIRE |
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