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Estudo para comparação do desempenho e custo de edifícios com e sem isolamento de base – Aplicação ao novo edifício do HFAR
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| 3.9 MB | Adobe PDF |
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Abstract(s)
A proteção de infraestruturas é essencial para atenuar o risco sísmico e permitir o funcionamento contínuo das organizações e serviços críticos, aquando da ocorrência de um sismo. O Isolamento de base é uma das soluções mais eficazes na prevenção sísmica, pois além de impedir o colapso, mantém, na generalidade dos casos, a operacionalidade dos edifícios.
A presente dissertação tem como objetivo principal aferir a redução que se pode alcançar nos elementos estruturais com a implementação desse sistema, diminuindo assim, os encargos inerentes à sua implementação.
Neste estudo, foi utilizado o projeto estrutural do novo edifício do Hospital das Forças Armadas (Lumiar - Lisboa), tendo sido, a partir do mesmo, desenvolvido um modelo de análise numérica tridimensional. Com esse modelo foi avaliado o desempenho do edifício, quando sujeito à ação sísmica regulamentar. Numa segunda fase, implementou-se no modelo, um sistema de isolamento de base. Posteriormente, efetuou-se uma reavaliação do desempenho sísmico e comparação com a situação inicial. Simultaneamente foi realizado um balanço entre os custos adicionais e as poupanças relativas à redução de elementos estruturais e redução de armaduras no edifício devido à implementação do sistema de isolamento de base. Seguida por uma avaliação custo-benefício.
Por fim, conclui-se que a aplicação de sistemas de isolamento de base, reduz significativamente os esforços gerados na estrutura durante a ocorrência de um sismo, e que essa redução é suficiente para obter uma poupança considerável no dimensionamento dos elementos estruturais verticais, acabando por compensar grande parte dos custos de implementação do sistema.
The protection of infrastructures is essential to mitigate seismic risk and allow the continuous operation of organizations and critical services when an earthquake occurs. Base isolation is one of the most effective solutions in seismic prevention, as in addition to preventing collapse, it maintains, in most cases, the operability of buildings. The main objective of this dissertation is to assess the reduction of structural elements that can be achieved with the implementation of this system, thus reducing the costs inherent to its implementation. In the present study, the structural design of the new building of the Hospital das Forças Armadas (Lumiar - Lisbon) was used, and a three-dimensional numerical analysis model was developed from it. With this model, the performance of the building was evaluated when subjected to regulatory seismic action. In a second phase, a base isolation system was implemented in the model. Subsequently, a reassessment of the seismic performance and comparison with the initial situation was carried out. At the same time, a balance was made between the additional costs and the savings related to the reduction of structural elements and the reduction of reinforcement in the building due to the implementation of the base isolation system. Followed by a cost-benefit assessment. Finally, it is concluded that the application of base isolation systems significantly reduces the efforts generated in the structure during the occurrence of an earthquake, and that this reduction is sufficient to obtain considerable savings in the dimensioning of the vertical structural elements, ending up compensating a great part of the costs of implementing the system.
The protection of infrastructures is essential to mitigate seismic risk and allow the continuous operation of organizations and critical services when an earthquake occurs. Base isolation is one of the most effective solutions in seismic prevention, as in addition to preventing collapse, it maintains, in most cases, the operability of buildings. The main objective of this dissertation is to assess the reduction of structural elements that can be achieved with the implementation of this system, thus reducing the costs inherent to its implementation. In the present study, the structural design of the new building of the Hospital das Forças Armadas (Lumiar - Lisbon) was used, and a three-dimensional numerical analysis model was developed from it. With this model, the performance of the building was evaluated when subjected to regulatory seismic action. In a second phase, a base isolation system was implemented in the model. Subsequently, a reassessment of the seismic performance and comparison with the initial situation was carried out. At the same time, a balance was made between the additional costs and the savings related to the reduction of structural elements and the reduction of reinforcement in the building due to the implementation of the base isolation system. Followed by a cost-benefit assessment. Finally, it is concluded that the application of base isolation systems significantly reduces the efforts generated in the structure during the occurrence of an earthquake, and that this reduction is sufficient to obtain considerable savings in the dimensioning of the vertical structural elements, ending up compensating a great part of the costs of implementing the system.
Description
Keywords
Isolamento de base sísmica análise numérica tridimensional dimensionamento custo-benefício Base isolation seismic activity three-dimensional numerical analysis sizing cost-benefit