Análise linear de estruturas planas aporticadas submetidas a carregamentos dinâmicos

Abstract

This work presents a study on the dynamic analysis of plane frames under the effects of earthquakes and wind. For this purpose, a specific program is developed, based on the matrix analysis of structures method and using the Newmark algorithm to solve the equation of motion. Two main applications are carried out: a seismic analysis, in which response spectra are constructed for different seismic zones in Brazil, as described in the NBR 15421:2023 standard, and for the seismic event that occurred in Maceió in March 2018; and a wind analysis, using the synthetic wind method to model gusts and their random variations over time and along the structure's height. The results of the seismic analysis show consistent patterns in structural responses under different scenarios, with variations in response amplitudes epending on the applied horizontal acceleration. On the other hand, the wind analysis, using the synthetic wind method, highlights the need for a more rigorous statistical treatment to accurately represent the random nature of the phenomenon. This method requires a greater number of simulations for a single event, resulting in a more extensive and less standardized analysis compared to the results obtained with the seismic analyses conducted in this study. The development of the program and the analyses carried out contribute to advancing theoretical knowledge on the dynamic analysis of structures, reinforcing the importance of adopting technical standards such as NBR 15421:2023 and NBR 6123:2023, which ensure procedural agreement and result accuracy.