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Advisor(s)
Abstract(s)
A ação sísmica além de ser uma realidade global que assola inúmeras regiões todo ano, é
também responsável por uma parte marcante da história e do desenvolvimento de
Portugal, como foi o caso do sismo de 1755, moldando assim, a forma como a sociedade
lida com os desafios sísmicos e impulsionando o desenvolvimento de uma abordagem
mais ativa em termos de prevenção tanto para garantir a estabilidade das estruturas
como para preservar a vida humana.
Este trabalho tem como objetivo principal a elaboração de um documento de aplicação
prática sobre a influência dos sistemas de contraventamento em estruturas metálicas
quando sujeitas a ações horizontais, mais especificamente no caso da ação sísmica. Deste
modo considerou-se os procedimentos descritos no Eurocódigo 8 [3], tanto para a
definição da ação sísmica, como para a verificação da capacidade dos elementos
estruturais. Com este intuito foram considerados vários casos de estudo baseados no
dimensionamento de pórticos idênticos, mas com diferentes sistemas resistentes a ações
horizontais, contraventamento em X, V ou V invertido e com ligações viga-pilar
resistentes a momentos.
Para a análise dos diversos casos de estudo foram realizadas simulações numéricas, tanto
estáticas como dinâmicas. De modo a otimizar o processo de dimensionamento dos
elementos estruturais recorreu-se à utilização do programa de cálculo automático
TRICALC, sendo, deste modo, apresentados modelos estruturais mais eficientes para
cada situação estudada.
No final são apresentadas algumas conclusões que podem vir a ser consideradas como
base para a escolha de um sistema estrutural eficiente para uma dada situação de projeto.
Seismic action, in addition to being a global reality that devastates countless regions every year, is also responsible for a significant part of Portugal's history and development, as was the case with the 1755 earthquake, thus shaping the way society deals with it. seismic challenges and driving the development of a more active approach in terms of prevention both to ensure the stability of structures and to preserve human life. The main objective of this work is to prepare a practical application document on the influence of bracing systems on metal structures when subjected to horizontal actions, more specifically in the case of seismic action. In this way, the procedures described in Eurocode 8 [3] were considered, both for defining the seismic action and for verifying the capacity of the structural elements. For this purpose, several case studies were considered based on the design of identical frames, but with different systems resistant to horizontal actions, X, V or inverted V bracing and with beam-column connections resistant to moments. To analyse the various case studies, numerical simulations were carried out, both static and dynamic. In order to optimize the process of dimensioning the structural elements, the automatic calculation program TRICALC was used, thus presenting more efficient structural models for each situation studied. Finally, some conclusions are presented that can be considered as a basis for choosing an efficient structural system for a given design situation.
Seismic action, in addition to being a global reality that devastates countless regions every year, is also responsible for a significant part of Portugal's history and development, as was the case with the 1755 earthquake, thus shaping the way society deals with it. seismic challenges and driving the development of a more active approach in terms of prevention both to ensure the stability of structures and to preserve human life. The main objective of this work is to prepare a practical application document on the influence of bracing systems on metal structures when subjected to horizontal actions, more specifically in the case of seismic action. In this way, the procedures described in Eurocode 8 [3] were considered, both for defining the seismic action and for verifying the capacity of the structural elements. For this purpose, several case studies were considered based on the design of identical frames, but with different systems resistant to horizontal actions, X, V or inverted V bracing and with beam-column connections resistant to moments. To analyse the various case studies, numerical simulations were carried out, both static and dynamic. In order to optimize the process of dimensioning the structural elements, the automatic calculation program TRICALC was used, thus presenting more efficient structural models for each situation studied. Finally, some conclusions are presented that can be considered as a basis for choosing an efficient structural system for a given design situation.
Description
Keywords
Ação Sísmica Estrutura Metálica Eurocódigo 8 Pórticos Sistemas de Contraventamento