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Advisor(s)
Abstract(s)
O presente estudo tem como objetivo caracterizar o comportamento da interface aço-betão
em lajes mistas formadas por chapa de aço colaborante sobre a qual é colocada uma camada
de betão e que são ligados por sistemas mecânicos ou de atrito.
Verificando a diversidade de chapas perfiladas disponíveis para execução desta solução
construtiva, podem surgir questões quanto aos benefícios relativos entre tipos de perfis
(reentrante e trapezoidal). O comportamento da chapa perfilada e em particular da interface,
foi avaliado recorrendo a uma metodologia adequada que permitiu descrever o caminho e o
equilíbrio de forças no elemento estrutural. Recorreu-se de uma metodologia decomposta em
duas partes: análise numérica e experimental.
Na análise numérica foram construídos modelos cálculo tridimensionais que permitiram
calcular, com recurso ao método de elementos finitos, as tensões atuantes em elementos
volumétricos. A informação obtida é analisada e interpretada de forma a descrever o caminho
de forças através da estrutura e é proposto um modelo de escoras e tirantes que permita
descrever o equilíbrio de forças no interior da secção trapezoidal. Com base na análise de
tensões é proposta uma nova solução para a conexão e apontam-se possibilidades de evolução
da forma das bossas atualmente utilizadas na solução corrente que é analisda ao longo do
trabalho.
Com a metodologia experimental, ensaiam-se provetes especificamente concebidos no âmbito
deste trabalho, com o intuito de demostrar que o modelo de escoras e tirantes é adequado e
que a solução proposta é viável.
Por fim, concluiu-se sobre a investigação realizada, e propõem-se pontos de partida para
investigações futuras.
This study aims to characterize the behavior of the steel-concrete interface in composite slabs formed by profiled steel plate on which a layer of concrete is placed, connected by mechanical systems or friction. Checking the diversity of profiled sheets available for this constructive solution, there may be questions about the relative benefits between types of profiles. The behavior of the profiled steel deck and interface was evaluated using a suitable methodology aiming to describe the path and the equilibrium of forces in the structural element. The used methodology can be decomposed into two parts: experimental and numerical analysis. In the numerical analysis, three-dimensional models were constructed, wich were used to calculate the stresses acting in the volumetric elements, using the finite element method. The information obtained was analyzed and interpreted to describe the force paths through the structure and a strut-and-tie model was proposed to describe the equilibrium of forces. Based on the stress analysis a new solution for the steel-concrete connection is proposed and some possibilities of evolution in the embossments shape for the common solution that is analyzed throughout the study, are indicated. With the experimental methodology, specimens specifically built in the frame of this work were tested in order to desmonstrate that the strut-and-tie model is appropriate and that the proposal solution is viable. Finally, research carried out is conclued and starting points for further investigations are proposed.
This study aims to characterize the behavior of the steel-concrete interface in composite slabs formed by profiled steel plate on which a layer of concrete is placed, connected by mechanical systems or friction. Checking the diversity of profiled sheets available for this constructive solution, there may be questions about the relative benefits between types of profiles. The behavior of the profiled steel deck and interface was evaluated using a suitable methodology aiming to describe the path and the equilibrium of forces in the structural element. The used methodology can be decomposed into two parts: experimental and numerical analysis. In the numerical analysis, three-dimensional models were constructed, wich were used to calculate the stresses acting in the volumetric elements, using the finite element method. The information obtained was analyzed and interpreted to describe the force paths through the structure and a strut-and-tie model was proposed to describe the equilibrium of forces. Based on the stress analysis a new solution for the steel-concrete connection is proposed and some possibilities of evolution in the embossments shape for the common solution that is analyzed throughout the study, are indicated. With the experimental methodology, specimens specifically built in the frame of this work were tested in order to desmonstrate that the strut-and-tie model is appropriate and that the proposal solution is viable. Finally, research carried out is conclued and starting points for further investigations are proposed.
Description
Keywords
Composite Slabs Interface Steel-Concrete Longitudinal Shear Resistance