Análise estrutural dinâmica de pisos de edifícios submetidos a atividades humanas rítmicas com base no uso de modelos biodinâmicos: modelagem experimental e numérica

Abstract

This research paper aims to evaluate the dynamic structural response of building floors under rhythmic human loading (aerobic activities). To achieve this objective, a biodynamic model consisting of mass, damping, and stiffness, represented as a Single Degree of Freedom (SDOF) system, is proposed to simulate rhythmic human actions on building floors and assess the dynamic human-structure interaction effect. The study focuses on the dynamic analysis of an existing reinforced concrete floor located on the 8th floor of the University of the State of Rio de Janeiro (UERJ), with dimensions of 16 m x 36 m and an area of 576 m². Initially, experimental modal analyses are performed using different strategies to evaluate the overall dynamic behavior of the investigated floor, aiming to calibrate the finite element model developed to represent the structure. Subsequently, dynamic experimental monitoring tests are conducted based on forced vibration analyses applied to the concrete slabs of the floor, allowing a comparative analysis between the experimental dynamic structural response and the results obtained through numerical modelling. Traditional mathematical functions representing rhythmic human dynamic actions, corresponding to "force-only" models, as well as biodynamic systems, are employed in the study. Based on the dynamic responses obtained, it is observed that the biodynamic models produce results closer to those observed in the experimental tests on the floor. These models consider the dynamic human-structure interaction effect, as well as individual characteristics such as mass, damping, and stiffness, resulting in attenuations of displacement and acceleration values. Additionally, a parametric study is conducted to analyze the dynamic structural behavior in relation to human comfort criteria, considering the limits established by relevant standards and design criteria. The results indicate that traditional dynamic loading models (only force) tend to yield more conservative dynamic responses, while modelling based on biodynamic systems provides response values (displacements and accelerations) closer to those determined through dynamic experimental monitoring of the investigated floor. Finally, it is emphasized that the proposed analytical methodology in this research work can be considered a viable alternative for characterizing rhythmic human dynamic actions on building floors, taking into account the dynamic human-structure interaction.