Análise do comportamento dinâmico, avaliação de conforto humano e controle de vibrações de edifícios altos submetidos à ação não determinística do vento com base na consideração do efeito da interação solo-estrutura

Abstract

Based on a favourable economic scenario combined with a significative technological advance in science materials and also construction processes, it must be emphasized that the Brazilian cities have shown substantial growth, regarding the construction of tall and slender buildings. This architectural trend has conducted the design of these buildings to solutions composed by very flexible structural systems, resulting in slender buildings with very low natural frequencies values and therefore more susceptible to problems of excessive vibrations, undesirable crack openings and even discomfort to the occupants. This way, having in mind the slenderness levels presented more recently, these buildings need to have their structural dynamic behaviour investigated, in order to ensure the human comfort. Thus, the aim of this research work is to investigate the dynamic behaviour, evaluates the human comfort and also study the structural control strategies aiming to reduce the excessive vibrations of tall buildings when subjected to the non-deterministic action of the wind, based on the consideration of the soil-structure interaction effect. In this study two structural models are investigated: the first one is related to a forty two-storey reinforced concrete building with 123,9 m high and the second model corresponds to a forty eight-storey steel-concrete composite building with 172,8 m, The results obtained along the numerical analysis performed on the investigated structural models, in terms of the displacements and accelerations values, are compared with the limits proposed by technical guides and design recommendations, aiming to evaluate the human comfort levels of the analysed buildings with and without the use of vibration control systems (passive damper systems), regarding to the situations of the design practice.