| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 48.33 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
A implementação de sistemas de controlo de vibraçÔes em engenharia civil, sobretudo
sistemas passivos, tem vindo a crescer, uma vez que constitui uma solução eficaz no
controlo de açÔes como o vento e sismos, e que não possui uma fonte de energia externa
para a sua operação. Um exemplo destes sistemas passivos, são os amortecedores de
massa sintonizada ou Tuned Mass Dampers (TMD), que constituem o objeto do presente
estudo. No entanto, em termos de aplicaçÔes em estruturas de edifĂcios existem algumas
limitaçÔes, como necessidade de espaço adicional no edifĂcio, para o deslocamento da
massa do sistema na sua ação de controlo, ou o de apenas controlar um modo de vibração
da estrutura. Além destas limitaçÔes dentre outras, o facto de num dimensionamento de
um TMD, apenas se considerar a estrutura, negligenciando o enchimento desta pelas
paredes nĂŁo estruturais, pode influenciar significativamente a eficĂĄcia do sistema. O
presente trabalho consiste no estudo da influĂȘncia do comportamento destas paredes nĂŁo
estruturais, nomeadamente a degradação da rigidez, da resistĂȘncia e o efeito de pinching,
no desempenho de amortecedores de massa sintonizada. Para tal, o recurso a modelos
numĂ©ricos serĂĄ necessĂĄrio para fundamentar os resultados e as evidĂȘncias do referido
estudo. Tendo como objetivo final, o de proporcionar um desempenho mais eficaz destes
sistemas passivos no controlo da resposta dinĂąmica das estruturas.
The use of vibration control systems in civil engineering, especially passive systems, has been growing, since it is an efficient solution in the control of load actions, such as wind and earthquakes, and there is no need for an external energy source for its operation. An example of such passive systems are the tuned mass dampers (TMD), which is the focus of the present study. However, in terms of its applications in building structures there are some limitations, such as the need for additional space in the building, due to the displacement of the mass of the system in its control action, or the control of only one mode of vibration of the structure. In addition to these limitations, the fact that in a TMD design, only the structure is considering, neglecting its filling by nonstructural walls, can significantly influence the efficiency of the referred system. The present work, consists in the study of the influence of the behaviour of these non-structural walls, viz., the stiffness degradation and strength degradation, and the pinching effect, in the performance of the tuned mass dampers. To do so, the use of numerical models will be necessary to justify the results and the evidences of this research. Its ultimate goal is to provide a more efficient performance of these passive systems in controlling the dynamic response of structures.
The use of vibration control systems in civil engineering, especially passive systems, has been growing, since it is an efficient solution in the control of load actions, such as wind and earthquakes, and there is no need for an external energy source for its operation. An example of such passive systems are the tuned mass dampers (TMD), which is the focus of the present study. However, in terms of its applications in building structures there are some limitations, such as the need for additional space in the building, due to the displacement of the mass of the system in its control action, or the control of only one mode of vibration of the structure. In addition to these limitations, the fact that in a TMD design, only the structure is considering, neglecting its filling by nonstructural walls, can significantly influence the efficiency of the referred system. The present work, consists in the study of the influence of the behaviour of these non-structural walls, viz., the stiffness degradation and strength degradation, and the pinching effect, in the performance of the tuned mass dampers. To do so, the use of numerical models will be necessary to justify the results and the evidences of this research. Its ultimate goal is to provide a more efficient performance of these passive systems in controlling the dynamic response of structures.
Description
Keywords
Amortecedores de Massa Sintonizada TMD Sistemas de Controlo de VibraçÔes Sistemas Passivos Controlo Estrutural