Análise da distribuição de momento fletor e força cortante devido à carga móvel em tabuleiros alargados de pontes rodoviárias retas em concreto armado
The increase in vehicle traffic on Brazilian highways and the increasing your weight and carrying capacity have required increasingly larger and more resistant bridges. Nonetheless, it is also necessary to adapt the old bridges to the current traffic conditions, carrying out activities to reinforce...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/44830 |
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| Resumo: | The increase in vehicle traffic on Brazilian highways and the increasing your weight and
carrying capacity have required increasingly larger and more resistant bridges. Nonetheless, it
is also necessary to adapt the old bridges to the current traffic conditions, carrying out activities
to reinforce and widen these structures. In this context, this research aims to analyze the
distribution of bending moments and shear forces due to the mobile load in superstructure of
straight bridges with multiple beams that went through a process of widening their cross section.
Therefore, the Leonhardt method adapted to bridges with wide decks, the numerical model by
Finite Element Method (FEM), using the CSiBridge® program, version 21, and the method
proposed by AASHTO LRFD (2017) were used. Analysis of bridge situations with different
numbers of beams, different numbers of intermediate transverses and with concretes of different
strengths in the widening region were carried out. As results, it is concluded that the distribution
of forces between beams of the same geometry depended fundamentally on the increase in the
rigidity of the deck, intensified by the increase in the strength of the concrete in the widening
region. In addition, it was observed that the greater the strength of the concrete in widening, the
more forces were absorbed by the widening beams and less by the existing beams. Finally, it
was observed that the number of intermediate transverses had little influence on the distribution
of forces between the beams of a widened bridge and that a greater number of beams added to
the original bridge resulted in greater stress relief in the initial beams. |
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