Browsing by Author "Rio, Ricardo"
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- Comparative study of calculation methods for designing slurry wallsPublication . Rio, Ricardo; Paula, António Miguel; Braz-César, ManuelThis paper presents a comparative study of several calculation methodologies of internally braced slurry walls. The slurry wall process results in the construction of a concrete wall perimeter that sets the stage for the excavation of the underground floors of a building structure. Although the analysis of slurry walls can be carried out with a simplified calculation procedure, there are different approaches to estimate forces and pressures on the wall that influence the design of the structure. Besides, the construction sequence in the case of braced systems hinders the structural analysis of the wall. Thus, in this paper it is intended to study the construction sequence of an internally baced system in order to analyse the influence of the calculation method in the design process of a slurry wall.
- Estudio comparativo de modelos de cálculo para el diseño de muros pantallaPublication . Rio, Ricardo; Paula, António Miguel; Braz-César, ManuelCuando se desea ejecutar un muro pantalla existen numerosas cuestiones a tener en cuenta. No se trata de una estructura común que pueda calcularse fácilmente y esperar un comportamiento similar a lo largo de su construcción y puesta en funcionamiento. Un muro pantalla es una compleja y elaborada sucesión de cálculos y fases que se redefinen y adaptan a medida que se ejecuta la estructura. En este artículo se va a estudiar cuál es la manera más adecuada y segura de poder elaborar un muro pantalla de forma que se pueda garantizar su puesta en funcionamiento, previendo los esfuerzos va a tener que soportar en cada momento de forma que su comportamiento sea el esperado. Para poder estudiar el comportamiento de un muro pantalla y la manera de abordar su diseño y posterior ejecución, en este artículo se ha querido evaluar un caso teórico con datos y características perfectamente posibles de manifestarse en un caso práctico.
- Semi‐active control algorithms for m-rheological dampersPublication . Braz-César, Manuel; Rio, Ricardo; Barros, RuiStructural control includes a wide variety of control methodologies that have been developed over the years to deal with specific problems of civil engineering applications. In this regard, magneto-rheological (MR) dampers seems to be a promising technology to develop semi-active control systems for vibration control of building and bridge structures. Although the application of these devices in actual structures is still emerging, its efficiency to reduce high winds and seismic-induced vibrations has been validated through numerous numerical simulations, experimental tests either in reduced and full scale models and also some real applications. A major challenge of this type of control system is related to the choice of suitable control algorithms that allow the specific features of these controllable devices to be fully exploited. Thus, this paper provides an overview of the fundamental control algorithms usually involved in developing semi‐active controllers with MR dampers for vibration suppression in civil engineering structures. The operating principle of each controller is briefly described specifying for each case the main requirements and also the fundamental control parameters that must be defined during the development of a semi‐active control system with MR dampers.
- Semi-active control algothims for magneto-rheological dampersPublication . Braz-César, Manuel; Rio, Ricardo; Barros, RuiStructural control includes a wide variety of control methodologies that have been developed over the years to deal with specific problems of civil engineering applications. In this regard, magneto-rheological (MR) dampers seems to be a promising technology to develop semi-active control systems for vibration control of building and bridge structures. Although the application of these devices in actual structures is still emerging, its efficiency to reduce high winds and seismic-induced vibrations has been validated through numerous numerical simulations, experimental tests either in reduced and full scale models and also some real applications. A major challenge of this type of control system is related to the choice of suitable control algorithms that allow the specific features of these controllable devices to be fully exploited. Thus, this paper provides an overview of the fundamental control algorithms usually involved in developing semi‐active controllers with MR dampers for vibration suppression in civil engineering structures. The operating principle of each controller is briefly described specifying for each case the main requirements and also the fundamental control parameters that must be defined during the development of a semi‐active control system with MR dampers.