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Estudo analítico sobre o desempenho de compósitos de FRP exteriormente colados a um substrato com amarração
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Resumo(s)
A possibilidade de futuramente se incluírem várias expressões em regulamentos ou
recomendações de dimensionamento de ligações coladas entre dois materiais estruturais requer
que se desenvolvam estudos mais teóricos que permitam perceber e dimensionar vários tipos
de ligações coladas. Atualmente ainda existe falta de conhecimento quando se consideram
algumas situações mais especificas e nas quais se usam amarrações adicionais para realizar
ligações entre compósitos de FRP e um outro elemento estrutural qualquer.
O presente trabalho centra-se no desenvolvimento de formulações algébricas que
permitam analisar o desempenho de ligações coladas entre dois materiais com comportamento
constitutivo essencialmente elástico. Foram obtidas as expressões analíticas do deslizamento,
da extensão e da tensão de aderência. Estas expressões permitem prever o processo de
descolamento da interface FRP/substrato. Posteriormente, foram analisados e interpretados os
resultados das amostras em que o comprimento colado é superior ao efetivo, ou seja, em que o
comprimento colado é de 250 mm e de amostras em que o comprimento colado é inferior ao
efetivo, ou seja, em que o comprimento colado é de 50 mm.
Com vista a validar o modelo analítico proposto, este foi comparado com os modelos
experimentais, analíticos e numéricos disponíveis na literatura.
The possibility of including various expressions in regulations or recommendations for the design of bonded joints between two structural materials in the future requires that more theoretical studies be developed to understand and design various types of bonded joints. There is currently still a lack of knowledge when considering some more specific situations in which additional ties are used to create joints between FRP composites and any other structural element. This work focuses on the development of algebraic formulations that allow the analysis of the performance of bonded joints between two materials with essentially elastic constitutive behavior. Analytical expressions for slip, extension and bond stress were obtained. These expressions allow the prediction of the debonding process of the FRP/substrate interface. Subsequently, the results of the samples in which the bonded length is greater than the effective length, i.e., in which the bonded length is 250 mm, and of samples in which the bonded length is less than the effective length, i.e., in which the bonded length is 50 mm, were analyzed and interpreted. In order to validate the proposed analytical model, it was compared with the experimental, analytical and numerical models available in the literature.
The possibility of including various expressions in regulations or recommendations for the design of bonded joints between two structural materials in the future requires that more theoretical studies be developed to understand and design various types of bonded joints. There is currently still a lack of knowledge when considering some more specific situations in which additional ties are used to create joints between FRP composites and any other structural element. This work focuses on the development of algebraic formulations that allow the analysis of the performance of bonded joints between two materials with essentially elastic constitutive behavior. Analytical expressions for slip, extension and bond stress were obtained. These expressions allow the prediction of the debonding process of the FRP/substrate interface. Subsequently, the results of the samples in which the bonded length is greater than the effective length, i.e., in which the bonded length is 250 mm, and of samples in which the bonded length is less than the effective length, i.e., in which the bonded length is 50 mm, were analyzed and interpreted. In order to validate the proposed analytical model, it was compared with the experimental, analytical and numerical models available in the literature.
Descrição
Palavras-chave
Compósitos FRP Aderência Análise analítica Análise não-linear