This paper presents a comparative study of the influence of shear walls on the behavior of a multi-storey concrete building when subjected to seismic actions. Two structures with different earthquake-resistant systems were evaluated. One is composed of concrete frames with usual detailing in both directions (x and y), and the other one is formed by a dual system, composed of frames and shear walls with usual detailing. The Equivalent Lateral Force procedure and the Modal Response Spectrum analysis presented by the Brazilian Technical Code ABNT NBR 15421:2006 were considered. The dual system building presented a greater stiffness with the shear walls arranged parallel to direction y. In the x direction, the responses are equivalent in both buildings. The horizontal forces obtained by the Equivalent Lateral Force method at the base of the buildings were greater than the Modal Response Spectrum method.
Thermal study of composite columns of steel hollow sections filled with concrete on fire situation
ResumoEsta pesquisa aborda a elevação da temperatura em pilares mistos de aço e concreto de seção tubular circular quando submetidos ao incêndio, objetivando apresentar uma análise sobre o aumento da temperatura em relação a alguns parâmetros estudados nos pilares mistos. As análises realizadas são numéricas, via método dos elementos finitos utilizando um programa desenvolvido em Matlab, denominado NASEN. Os modelos construídos foram validados com dados experimentais extraídos da literatura e com o programa computacional ATERM. Os resultados mostram que as elevações de temperaturas no aço e no concreto dependem de parâmetros como o volume de concreto e o volume de aço, visto que os materiais possuem propriedades térmicas bem distintas. O sistema misto para pilares mostrou-se eficaz na diminuição da temperatura do elemento estrutural quando comparado a pilares de aço tubulares.
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