Vigas híbridas sometidas a solicitaciones de cortante Propuesta de actualización de la Norma Venezolana COVENIN 1618:1998
[ANGLES] I-girders are frequently used in the steel structures construction, because they are capable of adapt to the project necessities and through them gain long distances, instead of commercial beams. In the pursuit of new alternatives for lighter and stronger structures were born the hybrid gir...
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| Tipo de documento: | dissertação |
| Data de publicação: | 2013 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | espanhol |
| OAI Identifier: | oai:upcommons.upc.edu:2099.1/18448 |
| Acesso em linha: | https://hdl.handle.net/2099.1/18448 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Building, Iron and steel Construccions metàl·liques Bigues d'acer Enginyeria civil -- Normes Àrees temàtiques de la UPC::Enginyeria civil Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures metàl·liques |
| Resumo: | [ANGLES] I-girders are frequently used in the steel structures construction, because they are capable of adapt to the project necessities and through them gain long distances, instead of commercial beams. In the pursuit of new alternatives for lighter and stronger structures were born the hybrid girders, which are made welding two flanges to a web. The steel of the flanges has higher yield strength than the steel’s web, this gives the name of hybrid to the girder. Transverse or longitudinal stiffening are commonly used in this kind of girder. Hybrid girders have proved to be a very attractive solution from a structural point of view as economical and environmental, because of their flexural capacity and material-cost savings. For these reasons hybrid girders have become commonly used as solution for train and road bridges. The incremental launching method is one of the techniques applied for the construction of this kind of structures now days, because of his logistical and economical simplicity. During this construction process massive concentrated forces load all sections of the structure at the time piers make contact with girders, generating instability phenomena like shear web buckling and patch loading. I-girders are capable to develop a post-buckling strength, however in the specifications prior to 2003, consideration of this strength in determining the shear resistance of hybrid girders was conservatively disallowed due to the lack of experimental data. As a result of a series of investigations carried out around the world, the shear strength provisions apply equally to homogeneous and hybrid girders in the United States of America and in Europe these days, although Venezuelan design specifications are not updated for unknown reasons. The main objectives of this investigation is to develop a proposal for the update of the Venezuelan design specification related with the shear buckling resistance of hybrid steel girders, present a data set of experiments related with this phenomena and the simulation of 75 girders by the fine element method. |
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