Avaliação do efeito da interação humana sobre pisos de edificações submetidos a atividades humanas rítmicas

Abstract

Over the past three decades several researchers have reported a significant incidence of slender and flexible structures having low inherent structural damping. Consequently, these structures are subject to excessive vibration induced by human activities which can cause great discomfort for its users. On the other hand, several authors have investigated the representation of rhythmic human activities by means of mathematical functions (force only models) in order to better evaluate, even at the design stage, the vibration levels in which the structural system is subjected as well as the human comfort occupants. Such mathematical functions have been more or less conservative regarding the final cost of the project. At the same time, recent studies have shown a more realistic way to simulate the contact between the human activity and civil structures, such as buildings floors, walkways and grandstands, through the study of the human-structure interaction, which involves an interdisciplinary approach to the field of biomechanics Therefore, this work investigates experimentally the influence of the structural system flexibility during practice of rhythmic activities (jumps) as well as the effect of the human on the structure. For this, the tests were carried out on two different types of structures in laboratory: rigid surface (laboratory floor) and flexible (vibrating) floor. In addition, three different methods were used to evaluate the experimental signals of the jumps, namely through a force platform, an accelerometer mounted on the human body and instrumented pressure insoles inside the footwear. It is worth mentioning that the human-structure aspect was evaluated considering both a passive (standing/ bent knees) and an active person (jumping) on the vibrating floor. In this sense, the achieved results throughout this work present some alternatives so that the designer engineer can better evaluate the behavior of buildings floors subjected to human rhythmic actions, both in relation to the human comfort and economic factors.