Análise de vibrações e avaliação do conforto humano de edifícios submetidos a cargas de vento via utilização de técnicas de CFD e bases de dados aerodinâmicos com testes em túnel de vento

Abstract

The modelling and calculation of the dynamic loads coming from the wind action on buildings require more elaborate analysis methodologies, taking into account the complexity of the phenomenon, in addition to the absolutely random nature of its behaviour. On the other hand, the interaction of wind actions on the buildings facades is preponderant and must be considered in the project phase. It should be noted that in recent decades, the design and construction of tall and slender buildings have produced flexible structural systems, with low natural frequency values and, therefore, more susceptible to excessive vibrations problems, when subjected to non-deterministic wind loads. This way, this research work aims to study the dynamic structural response and assess the human comfort of a 40-storey 150 m high reinforced concrete building with floor dimensions of 30 m by 60 m. The building dynamic analysis when subjected to non-deterministic dynamic wind loads is performed based on the use of the Spectral Representation Method (SRM). On the other hand, to support this investigation, the wind pressure coefficients were calculated through different ways, considering Computational Fluid Dynamics (CFD: Computational Fluid Dynamics) techniques, using aerodynamic databases from HFPI-TPU and DEDM-HR platforms, with wind tunnel tests; and also utilising the Brazilian design code NBR 6123. The numerical model developed for the reinforced concrete building dynamic analysis, adopted the usual mesh refinement techniques present in finite element method simulations and implemented in the ANSYS program. The main conclusions obtained in this research work aim to alert the civil engineers to the relevant modifications associated with the structure dynamic response, when different strategies are used to assess the wind pressure coefficients on the building’s facades.