Dynamic Analysis of Slender Buildings under Wind Loading

Resumo

This dissertation project aims to understand and compare methods that simulate the dynamic characteristics of atmospheric wind loads acting on slender structures, with a focus on NBR 6123 and the Synthetic Wind Method. The amount of research conducted on this topic since the 1960s has led to significant advancements in understanding the dynamic behavior of wind. This progress has facilitated the development of methodologies for quantifying its impact on buildings and the continuous refinement of these methodologies up to the present day. In this context, it is possible to encounter two key approaches: NBR 6123 (2023), developed by the Brazilian Association of Technical Standards, and the Synthetic Wind Method, initially proposed by Franco (1993). The Brazilian standard provides two methods to determine maximum values of variables such as acceleration, displacement, and forces for structures subjected to wind, without describing how these values vary over time. Despite advances in wind engineering studies and methodologies, the procedure described in the 1988 version of the standard remained unchanged in its 2023 update. On the other hand, the Synthetic Wind Method, first published in 1993 and subsequently refined until 2014, works by decomposing the fluctuating component of wind into harmonic functions. This approach not only allows to obtain absolute maximum values but also provides the structural response over time. To address this, a comparative study is planned between NBR 6123 (2023) and the most updated version of the Synthetic Wind Method. Additional relevant methods may also be included in the analysis to identify the limitations, advantages, and disadvantages of each approach.