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Abstract(s)
Trabalho acadĆ©mico com o objetivo do autor desenvolver um estudo prĆ©vio e um projeto de uma travessia sobre o rio Lima, na cidade de Viana do Castelo constituĆda por uma ponte de tirantes rodoferroviĆ”ria. O projeto acadĆ©mico visa, tambĆ©m, desenvolver e compreender: os conceitos bĆ”sicos, as metodologias de conceĆ§Ć£o, e o funcionamento de estruturas desse gĆ©nero. O motivo principal da escolha do tema Ć© a necessidade de uma alternativa Ć ponte Eiffel em Viana do Castelo, e juntando o facto de em Portugal nĆ£o existir nenhuma obra de arte de tirantes rodoferroviĆ”ria atĆ© ao presente, seria interessante estudar e projetar uma estrutura rodoferroviĆ”ria de tirantes.
Das diversas possibilidades de sistemas estruturais estudados, adotou-se uma ponte que acomodarĆ” 4 vias rodoviĆ”rias e 2 vias ferroviĆ”rias, com um desenvolvimento total de 660 metros, constituĆda por dois vĆ£os laterais com 165 metros cada um, e com um vĆ£o central de 330 metros. A obra de arte serĆ” em semi-leque com dois planos de tirantes, ancorados a duas torres de betĆ£o em Y invertido de altura aproximadamente de 110 metros. O tabuleiro serĆ” duplo misto aƧo-betĆ£o, constituĆdo por duas vigas trianguladas do tipo Warren, e por carlingas, afastadas entre si de 15 metros com secƧƵes tubulares metĆ”licas de espessura
variĆ”vel. As carlingas ao nĆvel superior suportam a laje de betĆ£o, que constitui a rodovia, e inferiormente, suportam outra laje de betĆ£o para a parte ferroviĆ”ria.
O trabalho inicia-se com o enquadramento conceptual geral da envolvente da obra de arte, seguidamente com apresentaĆ§Ć£o da evoluĆ§Ć£o histĆ³rica ao longo do tempo das pontes de tirantes, e Ć apresentaĆ§Ć£o de algumas pontes rodoferroviĆ”rias de tirantes.
Ć realizada uma anĆ”lise preliminar, onde se estudam as restriƧƵes, as condicionantes, o local de implantaĆ§Ć£o, e o sistema da configuraĆ§Ć£o geomĆ©trica a adotar na conceĆ§Ć£o estrutural.
SĆ£o descritos todos os tipos de materiais, equipamentos a utilizar, bem como as suas caracterĆsticas mecĆ¢nicas necessĆ”rias para o cĆ”lculo estrutural.
A quantificaĆ§Ć£o das aƧƵes e das combinaƧƵes de cĆ”lculo efetuaram-se de acordo com as normas em vigor nacionais e europeias, designadamente os EurocĆ³digos das vĆ”rias especialidades e o Regulamento de SeguranƧa e AƧƵes para Estruturas de EdifĆcios e Pontes.
Efetuou-se um prĆ©-dimensionamento e uma otimizaĆ§Ć£o de vĆ”rios sistemas estruturais possĆveis de todos os elementos estruturais, tendo em conta variĆ”veis de estudo como a economia e a resistĆŖncia estrutural das secƧƵes, por forma a chegar Ć soluĆ§Ć£o final.
A estrutura foi discretizada e analisada num modelo estĆ”tico tridimensional num programa de cĆ”lculo automĆ”tico. A anĆ”lise de resultados foi efetuada longitudinalmente para a verificaĆ§Ć£o dos Estados Limites Ćltimos e Estados Limites de UtilizaĆ§Ć£o dos elementos estruturais que constituem a ponte. Foi ainda efetuada uma estimativa orƧamental da ponte no rio Lima na cidade de Viana do Castelo.
Academic work whose authorās aim is to develop a previous study of a project of a cablestayed bridge across Lima River, in Viana do Castelo. The academic project target is to develop and understand the basic concepts, the methodology of conception and the behavior of structures of that kind. The main motive of the themeās choice is the necessity of an alternative to Eiffel Bridge in Viana do Castelo. Moreover there isnāt in Portugal any cablestayed road-railway bridge yet. Thus it would be interesting to study and project such a structure. From the diversity of structural systems studied, it was adopted a 4 road lane and 2 railway lane bridge, with a 660 meters development with two back spans of 165 meters each and a central span of 330 meters. The structure will be in a semi-fan system with two inclined cable planes anchored to two concrete towers in an inverted Y, which will be approximately 110 meters high. The deck will be a double steel-concrete composite structure, made of two Warren truss beams and cross beams 15 meters apart from each one with metal tubular sections of variable thickness. The level cross beams will bear the weight of the concrete slab, which constitutes the road, and below will bear another concrete slab for the railway. The work begins with the general conceptual framing of the work of art, followed by the presentation of the historic evolution of cable-stayed bridges. Some cable-stayed bridges are also presented. A preliminary analysis is done, where the restrictions, conditioning, place of implantation and the geometric configuration system to adopt in the structural conception are studied. All types of materials are described as well as equipmentās and mechanic features needed for structural design. The quantification of the actions and the design combinations were done according to the national and European standards, namely the Eurocodes of the various specialties and Safety Regulations and Actions for Bridges and Building Structures. A preliminary design and optimization of several possible structural systems of all structural elements was done, taking into account variables of study such as economy and the structural resistance of the sections, aiming at a final solution. The structure was discretized and analyzed in a tridimensional automatic calculation program. The analyses of results was done in longitudinal direction to verify Ultimate Limits State and Service Limits State of structural elements of a bridge. A budget was estimated of the bridge across Lima River in Viana do Castelo.
Academic work whose authorās aim is to develop a previous study of a project of a cablestayed bridge across Lima River, in Viana do Castelo. The academic project target is to develop and understand the basic concepts, the methodology of conception and the behavior of structures of that kind. The main motive of the themeās choice is the necessity of an alternative to Eiffel Bridge in Viana do Castelo. Moreover there isnāt in Portugal any cablestayed road-railway bridge yet. Thus it would be interesting to study and project such a structure. From the diversity of structural systems studied, it was adopted a 4 road lane and 2 railway lane bridge, with a 660 meters development with two back spans of 165 meters each and a central span of 330 meters. The structure will be in a semi-fan system with two inclined cable planes anchored to two concrete towers in an inverted Y, which will be approximately 110 meters high. The deck will be a double steel-concrete composite structure, made of two Warren truss beams and cross beams 15 meters apart from each one with metal tubular sections of variable thickness. The level cross beams will bear the weight of the concrete slab, which constitutes the road, and below will bear another concrete slab for the railway. The work begins with the general conceptual framing of the work of art, followed by the presentation of the historic evolution of cable-stayed bridges. Some cable-stayed bridges are also presented. A preliminary analysis is done, where the restrictions, conditioning, place of implantation and the geometric configuration system to adopt in the structural conception are studied. All types of materials are described as well as equipmentās and mechanic features needed for structural design. The quantification of the actions and the design combinations were done according to the national and European standards, namely the Eurocodes of the various specialties and Safety Regulations and Actions for Bridges and Building Structures. A preliminary design and optimization of several possible structural systems of all structural elements was done, taking into account variables of study such as economy and the structural resistance of the sections, aiming at a final solution. The structure was discretized and analyzed in a tridimensional automatic calculation program. The analyses of results was done in longitudinal direction to verify Ultimate Limits State and Service Limits State of structural elements of a bridge. A budget was estimated of the bridge across Lima River in Viana do Castelo.
Description
Keywords
Ponte de Tirantes Ponte RodoferroviĆ”ria Estruturas MetĆ”licas Estruturas Mistas AƧo-BetĆ£o TreliƧa Warren Rio Lima Viana do Castelo Cable-Stayed Bridge Road-Railway Bridge Steel Structures Steel-Concrete Composite Structure Warren truss Lima River