Study of lateral-torsional buckling in truss beams and lattice portal frames
In this work, we used a FEM software to study the buckling in truss structures. In the study, we considered different models of truss definitions, changing the boundary conditions and the load type, using a point load or distributed load. The software we used was ConSteel 16, a FEM software for stru...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10459.1/463958 |
| Acceso en línea: | https://hdl.handle.net/10459.1/463958 |
| Access Level: | acceso abierto |
| Palabra clave: | Lateral-torsional buckling Eurocode 3 Truss beams |
| Sumario: | In this work, we used a FEM software to study the buckling in truss structures. In the study, we considered different models of truss definitions, changing the boundary conditions and the load type, using a point load or distributed load. The software we used was ConSteel 16, a FEM software for structural analysis and design. To check if the FEM software worked properly, we used published experimental results of testing real trusses, and verified that the results obtained by the FEM software when modelling these trusses, under the same boundary and load conditions, were close enough to the experimental results. Then we used this software to get the critical instability load for the studied structures, and compared the ones obtained following Eurocode 3. We used the FEM software to optimize lattice portal frames. The optimized structures that we get were much lighter than the original ones designed according to the Eurocode 3. The main conclusions that we got was that the standards oversize the profiles in trusses, only considering the compressed chord on the buckling analysis, and not the whole structure. In these standards, we also missed the method to calculate the critical axial force or critical bending moment, so we needed to search for methods in other sources. The FEM software is a really good substitute to analyse the instability in different kind of structures. They allow a very accurate results in a short calculation time, for complex structures, in that using another method would be impossible. |
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