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Abstract(s)
A presente dissertação centra-se no desenvolvimento de uma ferramenta de cálculo automático, designada TendonTech, concebida para a modelação e análise de cabos em vigas de betão pré-esforçado. O betão pré-esforçado é amplamente utilizado na engenharia estrutural devido à sua capacidade de melhorar o desempenho das estruturas, reduzindo a fissuração e as deformações, além de aumentar a resistência. O comportamento destas estruturas é significativamente influenciado pelas perdas de préesforço, cuja quantificação é essencial para garantir a segurança e a eficácia do projeto. Neste contexto, a dissertação enfatiza a avaliação das perdas de pré-esforço, conforme estabelecido na norma NP EN 1992-1-1, que distingue perdas imediatas, como as resultantes do atrito e da deformação elástica, e perdas diferidas, associadas à relaxação do aço, à retração e à fluência do betão. A implementação do TendonTech incorpora a consideração destes fatores, assegurando a conformidade com os requisitos normativos. A ferramenta foi desenvolvida em Python, integrando o OpenSees para a análise estrutural e a interoperabilidade com software CAD para a modelação geométrica dos cabos. A interface de entrada de dados foi concebida para ser intuitiva, enquanto os resultados incluem saídas detalhadas e um mecanismo de tratamento de erros, garantindo a fiabilidade do programa. A validação do TendonTech foi conduzida através da comparação com os resultados obtidos pelo software ESTICA 2020, Programa de cálculo automático de estruturas de betão pré-esforçado da biblioteca de software de PENCIL Engenharia Lda, evidenciando a coerência do comportamento estrutural modelado. Este trabalho destaca o contributo das ferramentas computacionais para dimensionamento de estruturas pré-esforçadas. O TendonTech reforça a eficiência do processo de projeto, promovendo a aplicação das normas europeias e demonstrando a viabilidade de soluções tecnológicas no domínio da engenharia de estruturas.
This dissertation focuses on the development of an automated calculation tool, named TendonTech, designed for the modeling and analysis of tendons in prestressed concrete beams. Prestressed concrete is widely utilized in structural engineering due to its ability to enhance structural performance by reducing cracking and deformation, as well as increasing strength. The behavior of these structures is significantly influenced by prestress losses, the quantification of which is essential to ensure the safety and effectiveness of the design. In this context, the dissertation emphasizes the evaluation of prestress losses as outlined in the NP EN 1992-1-1 standard, which distinguishes between immediate losses, such as those resulting from friction and elastic deformation, and deferred losses associated with steel relaxation, concrete shrinkage, and creep. The implementation of TendonTech incorporates consideration of these factors, ensuring compliance with regulatory requirements. The tool was developed in Python, integrating OpenSees for structural analysis and interoperability with CAD software for the geometric modeling of tendons. The data input interface was designed to be intuitive, while the outputs include detailed results and an error handling mechanism, ensuring the program's reliability. Validation of TendonTech was conducted through comparison with results obtained from ESTICA 2020, an automated calculation program for prestressed concrete structures from the software library of PENCIL Engenharia Lda, demonstrating the consistency of the modeled structural behavior. This work highlights the contribution of computational tools to the design of prestressed structures. TendonTech enhances the efficiency of the design process, promotes the application of European standards, and demonstrates the feasibility of technological solutions in the field of structural engineering.
This dissertation focuses on the development of an automated calculation tool, named TendonTech, designed for the modeling and analysis of tendons in prestressed concrete beams. Prestressed concrete is widely utilized in structural engineering due to its ability to enhance structural performance by reducing cracking and deformation, as well as increasing strength. The behavior of these structures is significantly influenced by prestress losses, the quantification of which is essential to ensure the safety and effectiveness of the design. In this context, the dissertation emphasizes the evaluation of prestress losses as outlined in the NP EN 1992-1-1 standard, which distinguishes between immediate losses, such as those resulting from friction and elastic deformation, and deferred losses associated with steel relaxation, concrete shrinkage, and creep. The implementation of TendonTech incorporates consideration of these factors, ensuring compliance with regulatory requirements. The tool was developed in Python, integrating OpenSees for structural analysis and interoperability with CAD software for the geometric modeling of tendons. The data input interface was designed to be intuitive, while the outputs include detailed results and an error handling mechanism, ensuring the program's reliability. Validation of TendonTech was conducted through comparison with results obtained from ESTICA 2020, an automated calculation program for prestressed concrete structures from the software library of PENCIL Engenharia Lda, demonstrating the consistency of the modeled structural behavior. This work highlights the contribution of computational tools to the design of prestressed structures. TendonTech enhances the efficiency of the design process, promotes the application of European standards, and demonstrates the feasibility of technological solutions in the field of structural engineering.
Description
Keywords
Betão Pré-Esforçado Perdas Imediatas Perdas Diferidas Diagrama de Magnel Análise Estrutural Openseespy Pyhton Modelação de Cabos Tendontech Cálculo Automático Prestressed Concrete Immediate Losses Time Dependant Losses Magnel Diagram