Uma abordagem de modelação numérica tridimensional do comportamento de longo prazo de vias-férreas considerando a interação dinâmica veículo-via
DOI:
https://doi.org/10.14195/2184-8394_155_6Palavras-chave:
via-férrea, deformação permanente, comportamento resiliente não-linear, modelação numéricaResumo
A complexidade do sistema via-férrea, em termos da variabilidade do comportamento estrutural e material ao longo de seu ciclo de vida, tem-se constituído um obstáculo para o estabelecimento de métodos robustos de previsão do seu comportamento de longo-prazo. Neste trabalho apresenta-se uma implementação computacional que incorpora algumas funcionalidades para uma reprodução mais realista desse comportamento, face a outras existentes. Para demonstrar as potencialidades desta ferramenta, são analisados cenários de plena via, tendo-se introduzido, em alguns deles, uma travessa sem apoio na camada de balastro (“travessa suspensa”), de forma a analisar o impacto dessa anomalia no desempenho da via sob a aplicação de milhões de ciclos de carga, relativos a diferentes veículos. Esta abordagem permitiu avaliar a interdependência entre efeitos dinâmicos, como a interação roda-carril, e efeitos de longo prazo, como a evolução das trajetórias de tensões no interior da camada de balastro, evidenciando um ciclo retroalimentado entre esses dois processos.
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