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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...
Multi-fixed smeared 3d crack model to simulate the behavior of fiber reinforced...
Gouveia, A. Ventura; Barros, Joaquim A. O.; Azevedo, Álvaro F. M.; Sena-Cruz, JoséWhen a concrete structure is subjected to a multi-stress state, different crack modes can be developed. To simulate with enough accuracy these fracture modes, a three dimensional model must be used. In the present work, a multi fixed smeared 3D crack model is proposed to predict the normal and shear failure modes of concrete structures. Softening stress strain diagrams are proposed to model, after crack initiat...
Cálculo orgânico de secções quaisquer em flexão desviada segundo o Eurocódigo 2
Miranda, Hélder; Azevedo, Álvaro F. M.; Sena-Cruz, JoséNeste trabalho são apresentados os resultados do desenvolvimento de um código computacional destinado à resolução de problemas de verificação e dimensionamento de secções compósitas genéricas, sujeitas a flexão composta desviada, de acordo com o Eurocódigo 2. É efectuada a sintetização da informação relativa ao comportamento dos materiais correntemente utilizados em secções compósitas. Foram estudados modelos ...
Near surface mounted CFRP strips for the flexural strengthening of RC columns :...
Barros, Joaquim A. O.; Varma, R. K.; Sena-Cruz, José; Azevedo, Álvaro F. M.In the present work, a strengthening technique based on near surface mounted (NSM) carbon fibre laminate strips bonded into slits opened on the concrete cover is used to improve the flexural capacity of columns subjected to bending and compression. This technique avoids the occurrence of the peeling phenomenon, is able to mobilize the full strengthening capacity of the strips, and provides higher protection aga...
Numerical simulation of thin steel fiber self-compacting concrete structures
Barros, Joaquim A. O.; Pereira, E. N. B.; Gouveia, A. Ventura; Azevedo, Álvaro F. M.Steel Fiber Reinforced Self Compacting Concrete (SFRSCC) was developed and applied on the manufacture of structural façade panels composed of a grid ribbed system covered by a layer of 30 mm thickness. Panel prototypes of this structural system were tested using loading configurations that promote the flexural and the punching failure modes in order to assess the benefits of fiber reinforcement to the flexural ...
Crack constitutive model to simulate the behavior of fiber reinforced concrete ...
Gouveia, A. Ventura; Barros, Joaquim A. O.; Azevedo, Álvaro F. M.; Sena-Cruz, JoséFor some structural applications, mainly with redundant supports, adding fibers to concrete can be an economic strategy, especially when shear brittle failure mode has a high risk of occurrence. In the present work, a crack constitutive model is proposed to simulate localized failure modes due to punching. The performance of the developed constitutive model was appraised by simulating the behavior observed in p...
Numerical simulation of the nonlinear behavior of RC beams strengthened with NS...
Sena-Cruz, José; Barros, Joaquim A. O.; Azevedo, Álvaro F. M.; Gouveia, A. VenturaThis paper describes some experimental tests carried out in the context of the evaluation of the bond behavior associated with NSM CFRP reinforcement. These results were used in the numerical simulation of the material nonlinear behavior of RC beams strengthened with NSM strips. For this purpose, an elasto-plastic multi-fixed smeared crack model was developed and implemented in the FEMIX computer code. The obta...
Bond behavior of near-surface mounted CFRP laminate strips under monotonic and ...
Sena-Cruz, José; Barros, Joaquim A. O.; Azevedo, Álvaro F. M.; Gettu, RavindraNear-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) laminate strips are used to increase the load-carrying capacity of concrete structures by inserting them into slits made in the concrete cover of the elements to be strengthened and gluing them to the concrete with an epoxy adhesive. In several cases the NSM technique has substantial advantages when compared with externally bonded laminates. In o...
Implementação da técnica do arc-length e métodos relacionados no programa de el...
Gouveia, A. Ventura; Barros, Joaquim A. O.; Azevedo, Álvaro F. M.; Sena-Cruz, JoséRelatório 06-DEC/E-20
Design methods for steel fiber reinforced concrete industrial floors
Barros, Joaquim A. O.; Gouveia, A. Ventura; Sena-Cruz, José; Azevedo, Álvaro F. M.; Antunes, J. A. B.Industrial floors are still the main application of steel fiber reinforced concrete (SFRC). Crack control joints are made to concentrate the crack propagation in these weakness-induced surfaces, resulting in a floor divided in panels. The design of a SFRC floor is currently made by means of the study of one of these panels, using the yield line method (YLM). The ultimate load of the panel depends on the maximum...
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