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Seismic analysis of reinforced concrete buildings with participating masonry infills

ABSTRACT In this paper, seismic analyses are performed of a reinforced concrete frame building with participating masonry walls are carried out. The spectral method of the Brazilian code – ABNT 15421:2006 – was used to obtain the lateral seismic loads. The equivalent diagonal-strut model was employe...

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Published in:Revista IBRACON de estruturas e materiais 2021, Vol.14 (3)
Main Authors: Alva, Gerson Moacyr Sisniegas, Rigão, Alessandro Onofre, Kaminski Junior, João, Pinheiro, Marco Antônio Silva
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description ABSTRACT In this paper, seismic analyses are performed of a reinforced concrete frame building with participating masonry walls are carried out. The spectral method of the Brazilian code – ABNT 15421:2006 – was used to obtain the lateral seismic loads. The equivalent diagonal-strut model was employed to simulate the axial stiffness of the masonry walls in the frames, according to different formulations founded in literature. The main purpose is to evaluate the differences implemented by the different formulations for the equivalent strut on the seismic response. This paper also aims at comparing results obtained when the masonry stiffness is not considered under seismic loads. The results obtained are analyzed with the purpose of providing contributions for structural engineers in the design of framed structure buildings with participating masonry walls subjected to seismic loads. RESUMO Neste trabalho são realizadas análises sísmicas em edifício de concreto armado com sistema estrutural de pórticos preenchidos com alvenarias participantes. Para a determinação das forças sísmicas, utiliza-se o método espectral da ABNT NBR 15421:2006. Para a simulação da rigidez axial das alvenarias nos pórticos emprega-se o modelo de diagonal equivalente, segundo diversas expressões encontradas na literatura. O principal objetivo é avaliar as diferenças entre essas expressões da literatura para a diagonal equivalente na resposta sísmica. Outro objetivo é de comparar resultados ao se desconsiderar a rigidez das alvenarias sob a ação sísmica. Os resultados são comentados e fornecem contribuições a engenheiros estruturais para o projeto de estruturas aporticadas de edifícios com alvenarias participantes submetidos a ações sísmicas.
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participating masonry, infilled frames, dynamic analysis
structural analysis
title Seismic analysis of reinforced concrete buildings with participating masonry infills
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