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Pontes integrais: estado da arte

Authors: Correia, Joana Ferreira do Nascimento;

Pontes integrais: estado da arte

Abstract

Pontes integrais são obras que não utilizam juntas de dilatação ou aparelhos de apoio para acomodar os movimentos horizontais do tabuleiro e em que as cargas são transferidas atodos os elementos verticais com uma ligação monolítica aos encontros. Este conceito surgiu associado à motivação de eliminar os custos associados à manutenção destes mecanismos. Sendo que os encontros e pilares são os responsáveis por acomodar todas as movimentações horizontais do tabuleiro, gera-se uma complexa interação entre a estrutura e o solo, sendo esta a grande dificuldade na conceção destas pontes. As movimentações provocadas pela ação da temperatura e os efeitos diferidos, retração e fluência, provocam deslocamentos da estrutura, que irão gerar forças e momentos fletoresnas fundações, pelo que a sua ação não pode ser nunca desprezada quando se trata do dimensionamento de pontes integrais. Nesta dissertação são discutidas e apresentadas as diferentes formas como nos vários países, que se têm utilizado e desenvolvido esta técnica, se vêm desenvolvendo esforços para a melhorar- estado da prática – e são também discutidos os vários métodos a que se recorre atualmente para simular, o mais coerentemente possível, esta relação do solo com a estrutura.

Abstract: Integral abutment bridges do not use expansion joints or abutment bearings to accommodate the horizontal movements of the deck and the loads are transferred to the vertical elements through monolithic connections. This concept has been developed and adopted due to the concern with reductions of costs related with the maintenance of thesemechanisms. Being the abutments and piles responsible for accommodating all the horizontalmovements that take place in the superstructure, a complex interaction between the soil and the structure occurs, being this the major difficulty in understanding the behaviour of this type of bridges. The movements originated by the temperature variations, creep and shrinkage generate displacements of the structure, that will generate forces and bending moments, so that these actions are really important to consider during the design of integral abutment bridges. In this dissertation we shall discuss and present the different efforts that various countrieshave made to develop this technique, as well as the different methods currently used to coherently simulate the soil-structure interaction.

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Portugal
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Keywords

Thermal action, Ação térmica, SoilStructure interaction, Interação soloestrutura, Efeitos diferidos, Integral abutment bridges, Creep, Pontes integrais, Shrinkage

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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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