Análise Sísmica de uma Estrutura de Concreto no Domínio do Tempo e no Domínio da Frequência

Abstract

Brazil, despite of being a region of low seismicity, has a considerable amount of earthquakes, wich makes important the structural dynamic analysis for a more assertive project. This project aims to test several methodologies of structural dynamic analysis of a building. The specific objectives are the comparison of The Newmark and Duhamel methods for time domain analysis, comparison of the pseudoacceleration spectrum of NBR-15421 (2006) with random artificial earthquake spectra and comparison of time domain methodologies with frequency domain methodologies. The structure modeling was done from a spreadsheet of calculation and use of SATiF software in Python language. After the modeling, the methodologies of Kanai (1961) and Tajimi (1960) and Shinozuka and Jan (1972) were used to generate the ramdom artificial earthquake. The earthquake was then applied to the structure and the results were analyzed using Newmark and Duhamel methodologies for time domain analysis. Then, the frequency domain analysis was performed using the Brazilian standard NBR-15421 (2006) and compared the spectrum of pseudo-accelerations presented by it, with the spectrum generated from the random earthquakes created in the time domain analysis. Finally, a comparison of all methods and their results was made, and it was concluded that each method analyzed in this review has advantages and disadvantages, and it is up to the structural designer to use the one that best suits the situation to be analyzed.