Encontrados 19 documentos, a visualizar página 1 de 2
A displacement formulation for cylindrical shells under radial loads
Madureira, L.; Fonseca, E.M.M.; Barros, R.C.A displacement formulation for cylindrical shells subjected to radial loads is presented. Static loads are applied to straight thin pipes using a variational method and results are compared both to finite element analysis and a shell element from Ansys program. The formulation includes a combination of trigonometric functions in two variables, longitudinal and circumferential direction. Then a system of differe...
Semi-active vibration control of buildings using MR dampers: numerical and expe...
Braz César, M.T.; Barros, R.C.The present work describes part of the R&D on using a semi-active structural control technique in a civil engineering experimental model frame equipped with a MR damper, developed within COVICOCEPAD project approved in the framework of Eurocores program S3T. Some results are provided associated with the calibration of a MR damper at FEUP as well as on the experimental modal identification of the dynamic propert...
Estudo numérico sobre o controlo semi-activo o de um pórtico metálico com amor...
Braz César, M.T.; Barros, R.C.O presente trabalho pretende apresentar parte da investigação desenvolvida no âmbito do projeto COVICOCEPAD relativa ao controlo semi-activo de estruturas de engenharia civil através da utilização de amortecedores Magneto-Reológicos (MR). Para este efeito foi construído um modelo numérico que permite a inclusão do comportamento do martecedor MR no modelo estrutural através de uma formulação em espaço de estado....
A parametric study on a RC frame based on “PUSHOVER” analysis
Pereira, V.G.; Barros, R.C.; Braz César, M.T.Three commercial software packages (SAP 2000, SeismoStruck and MIDAS/CIVIL) universally used in the design of civil engineering structures, are applied on a parametric study of pushover analyses of a RC frame of an office building under a few evaluative phases. In order to represent the influence of the masonry infill panels the equivalent tie method is used; for a sensitivity study on the capacity curves, seve...
Geometric and material nonlinear analysis of imperfect circular hollow section...
Gonçalves, G.; Barros, R.C.; Braz César, M.T.The comparison between theoretical predictions and design curve predictions of the critical stresses, for a wide range of slenderness ratio, is valid and useful. For columns made of steel S235 with initial deformations and slenderness below about 60, columns capacity is controlled by elastic-plastic resistant and performance, as the slenderness decreases (until the minimum limit, controlled by crushing or plast...
Some resesarch on control of vibrations in civil engineering under covicocepad...
Barros, R.C.; Baratta, A.; Corbi, O.; Braz César, M.T.; Paredes, M.Some information is provided on the latest R&D within COVICOCEPAD project approved in the framework of Eurocores program. It addresses the use of TMD’s TLD’s, base isolation devices, MR dampers and a hybrid technique using both devices together. Some results are provided associated with calibration of a MR damper at FEUP, as well as its inclusion in a small scale laboratory set-up with proper equations of motio...
Seismic performance of metallic braced frames by pushover analysis
Braz César, M.T.; Barros, R.C.A preliminary investigation is presented on a pushover analysis used for the seismic performance of metallic braced frames equipped with diagonal X-bracing and K-bracing systems. Three steel frames were analysed corresponding to 3, 6 and 10 floor regular buildings. The frames were modelled in the MIDAS/Civil finite element software and in the analyses nonlinear static methods were used to obtain the pushover cu...
R&D on control of vibrations under covicocepad during 2007-2008
Barros, R.C.; Baratta, A.; Corbi, O.; Braz César, M.T.; Corbi, I.; Bairrão, R.; Guerreiro, L.; Oliveira, C.; Magonette, G.This paper provides information on the latest R&D within COVICOCEPAD project approved in the framework of Eurocores program. It addresses the use of TLD, base isolation devices, MR dampers and a hybrid technique using both devices together. Some results are provided associated with calibration of a MR damper at FEUP, as well as its inclusion in a small scale laboratory set-up with proper equations of motion of ...
Seismic performance of metallic braced frames by pushover analyses
Braz César, M.T.; Barros, R.C.A preliminary investigation is presented on a pushover analysis used for the seismic performance of metallic braced frames equipped with diagonal X-bracing and K-bracing systems. Three steel frames were analysed corresponding to 3, 6 and 10 floor regular buildings. The frames were modelled in the MIDAS/Civil finite element software and in the analyses nonlinear static methods were used to obtain the pushover cu...
Estudo sobre a influência do esforço axial no comportamento de isoladores de b...
Braz César, M.T.; Barros, R.C.Neste estudo apresenta-se um modelo numérico utilizado no código de cálculo ABAQUS para a análise de elastómeros. Este modelo foi utilizado para estudar o comportamento de isoladores sísmicos para estruturas de edifícios (isolamento de base do tipo HDRB). Numa primeira fase valida-se o modelo numérico através da comparação com resultados experimentais e posteriormente efectua-se um estudo paramétrico para avali...
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