Encontrados 52 documentos, a visualizar página 1 de 6
Numerical modelling of the punching behaviour of steel fibre reinforced self-co...
Barros, Joaquim A. O.; Teixeira, Marcos D. E.; Cunha, Vítor M. C. F.; Moraes-Neto, B. N.; Gouveia, A. VenturaPunching shear failure on flat reinforced concrete slabs of residential and commercial buildings is generally avoided by using transversal reinforcement and/or chapiters. The first option requires intense labour, mainly when densely flexural reinforcement exists in the potential punching failure region, with detrimental consequences in terms of costs of this construction solution. The second option has also ext...
Model to simulate the behaviour of RC beams shear strengthened with ETS bars
Barros, Joaquim A. O.; Breveglieri, Matteo; Gouveia, A. Ventura; Dalfré, Gláucia; Aprile, AlessandraTo predict correctly the deformational and the cracking behavior of reinforced concrete elements failing in shear using a smeared crack approach, the strategy adopted to simulate the crack shear stress transfer is crucial. For this purpose, several strategies for modeling the fracture mode II were implemented in a smeared crack model already existing in the FEM-based computer program, FEMIX. Special development...
A FEM-based model to predict the behaviour of RC beams shear strengthened accor...
Barros, Joaquim A. O.; Baghi, Hadi; Dias, Salvador J. E.; Gouveia, A. VenturaExperimental research has demonstrated the excellent performance of the near surface mounted (NSM) technique with carbon fibre reinforced polymer (CFRP) laminates for the shear strengthening of reinforced concrete (RC) beams. This paper presents a finite element analysis to evaluate the behaviour of RC beams shear strengthened with NSM CFRP laminates. To predict correctly the deformational and the cracking beha...
Capacitively coupled rf coupled plasmas in N2-H2 mixtures
Mahjoub, A.; Gouveia, A.; Carrasco, N.; Pintassilgo, C. D.; Marques, L.; Ramos, Marta M. D.; Alves, L. L.; Cernogora, G.This paper studies the modifications induced in low-pressure radio-frequency (rf) capacitively coupled nitrogen plasmas, by the addition of a few amount of hydrogen (up to 5%). The work is an intermediate step towards the study of N2-CH4 plasmas, for the simulation of the ionospheric chemistry of Saturn's satellite Titan. The plasmas are studied using both experiments and simulations. The experimental setup is...
RF capacitively coupled plasmas in N2-H2 mixtures
Mahjoub, A.; Gouveia, A.; Carrasco, N.; Pintassilgo, C. D.; Marques, L.; Ramos, Marta M. D.; Alves, L. L.; Cernogora, G.Comunicação em Poster ; This paper studies the modifications induced in low-pressure radio-frequency capacitively coupled nitrogen plasmas, by the addition of a few amount of hydrogen (up to 5%). The plasmas are studied using both experiments (electrical and optical emission spectroscopy measurements) and simulations (using a fluid+kinetic code). Results reveal that the electron density increases with the amou...
Experimental characterization of capacitively coupled radio-frequency discharge...
Gouveia, A.; Mahjoub, A.; Carrasco, N.; Marques, L.; Alves, L. L.; Cernogora, G.; Pintassilgo, C. D.We have performed extensive measurements in capacitively coupled radio-frequency discharges, producing N2-CH4 plasmas for methane concentrations between 0% and 10%. These dusty plasmas are well characterized by monitoring the evolution, with the methane concentration, of the electron density, the self-bias voltage, the coupled power, and the spectral line intensity of a number of optical transitions. The plasma...
Aplicação de microbetão para o reforço de elementos estruturais em betão armado...
Cunha, Frederico; Lourenço, Lúcio; Gonçalves, Delfina; Barros, Joaquim A. O.; Gouveia, A. VenturaNo presente trabalho avalia-se a eficácia de uma técnica de reforço para elementos estruturais em betão armado afetados pela exposição a temperaturas elevadas e/ou fogo. Para tal, desenvolveu-se um programa experimental que incluiu a moldagem de catorze provetes prismáticos (150 x 150 x 600 mm 3 ) em betão de classe resistente corrente em estruturas de betão armado existentes no edificado português (C20/...
Recommendations for Mutational Analysis in Gastrointestinal Stromal Tumors (GIS...
Lopes, J M; Faculdade de Medicina do Porto, Serviço de Anatomia Patológica do Centro Hospitalar de S.João, e IPATIMUP, Porto - PortugalGIST Portuguese Working Group – Condeixa ProposalThe authors outline recommendations for the mutational analysis of GISTs unanimously approved by a multidisciplinary group on July 20th, 2062. The mutational status of KIT and PDGFRA allows identifying therapeutic targets to tyrosine kinase inhibitors (TKIs), and therefore, the safe clinical practice in the biotherapy decisions for patients with GISTs should incl...
Crack constitutive model for the prediction of punching failure modes of fiber ...
Barros, Joaquim A. O.; Gouveia, A. Ventura; Azevedo, Álvaro F. M.The capability of a multi-directional fixed smeared crack constitutive model to simulate the flexural/punching failure modes of fiber reinforced concrete (FRC) laminar structures is discussed. The constitutive model is implemented in a computer program based on the finite element method, where the FRC laminar structures were simulated according to the Reissner-Mindlin shell theory. The shell is discretized into...
CFRP flexural and shear strengthening technique for RC beams : experimental and...
Barros, Joaquim A. O.; Costa, Inês; Gouveia, A. VenturaNear surface mounted (NSM) technique has proved to be a very effective technique for the flexural strengthening of RC beams. Due to the relatively small thickness of the concrete cover that several beams present, cutting the bottom arm of steel stirrups for the installation of NSM laminates might be a possible strategy, whose implications on the beam’s load carrying capacity need to be assessed. When steel stir...
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