Encontrados 38 documentos, a visualizar página 1 de 4
Bond between glulam and NSM CFRP laminates
Sena-Cruz, José; Jorge, Marco; Branco, Jorge M.; Cunha, Vitor M. C. F.With the aim of evaluating the bond behaviour between glulam and carbon fibre reinforced polymer laminates strips, an experimental program using pull-out tests was carried, when the near-surface strengthening technique is applied. Two main variables were studied: the bond length and the type of pull-out test configuration. The instrumentation included the loaded and free-end slips, as well as the pull-out force...
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...
Relation between fibre distribution and post-cracking behaviour in steel fibre ...
Abrishambaf, A.; Barros, Joaquim A. O.; Cunha, Vitor M. C. F.In this research, the influence of the fibre distribution and orientation on the post-cracking behaviour of steel fibre 14 reinforced self-compacting concrete (SFRSCC) panels was studied. To perform this evaluation, SFRSCC panels 15 were cast from their centre point. For each SFRSCC panel, cylindrical specimens were extracted and notched either 16 parallel or perpendicular to the concrete flow direction, in ord...
Bond behavior between glulam and GFRP's by pullout tests
Sena-Cruz, José; Branco, Jorge M.; Jorge, Marco; Silva, Catarina V.; Cunha, Vitor M. C. F.To evaluate the bond behavior between glulam and GFRP rods, applied according to the near-surface mounted strengthening technique, an experimental program composed of beam and direct pullout tests was carried. In this experimental program three main variables were analyzed: the GFRP type, the GFRP location into the groove, and the bond length. From the monitoring system it was registered the loaded and free end...
Corn cob lightweight concrete for non-structural applications
Pinto, Jorge; Vieira, Barbosa; Pereira, Hélder; Jacinto, Carlos; Vilela, Paulo; Paiva, Anabela; Pereira, Sandra; Cunha, Vitor M. C. F.; Varum, HumbertoA lightweight concrete using granulated corn cob (without corn) as an aggregate is proposed in this research work. Taking into account that corn cob, after extracting the corn, is generally considered an agricultural waste, an interesting economic and sustainable benefit may result by using it as a building material. Therefore, it can be an alternative sustainable lightweight aggregate solution in comparison to...
Numerical simulation of three-point bending tests : two distinct approaches
Cunha, Vitor M. C. F.; Barros, Joaquim A. O.; Sena-Cruz, JoséIn this work are presented and discussed the numerical simulations carried out for indirect tensile tests of steel fibre reinforced self-compacting concrete specimens. The post-cracking behaviour was modelled with two distinct approaches. Within the scope of the first one, the s-w relationships were obtained by an inverse analysis procedure up to distinct ultimate crack widths. The other approach consisted on m...
Assessment of fibre orientation and distribution in steel fibre reinforced self...
Abrishambaf, A.; Barros, Joaquim A. O.; Cunha, Vitor M. C. F.; Cunha, F. N. M.The benefits of adding fibres to concrete lie, mostly, in improving the post-cracking behaviour, since its ability to transfer stresses across cracked sections is substantially increased. The post-cracking strength is dependent not only on the fibre geometry, mechanical performance and fibre/matrix interface properties, but also on the fibre orientation and distribution. Previous works have shown that in se...
Argamassa de reboco reforçada com resíduos da indústria têxtil do tipo fio
Peixoto, A.; Vieira, J.; Paiva, A.; Fernandes, L.; Tavares, P.; Morais, J.; Oliveira, Daniel V.; Caldeira, F.; Varum, H.; Cunha, Vitor M. C. F.Este trabalho de investigação pretende estudar o efeito da incorporação de fibras de resíduos da indústria têxtil nas argamassas de reboco e auscultar o potencial deste material compósito. Neste caso, os resíduos da indústria têxtil considerados são fios ou pedaços de tecido ou malhas, e poderão ter uma grande variabilidade material (e.g. composição, espessura, densidade, entre outras). Aspetos relacionados com...
Camada de regularização com agregado de granulado de caroço da espiga de milho
Pinto, J.; Pereira, H.; Vilela, P.; Jacinto, C.; Vieira, J.; Paiva, A.; Pereira, S.; Ferreira, J.; Cunha, Vitor M. C. F.; Varum, HumbertoUm conjunto de construções antigas localizadas na região de Trás-os-Montes e Alto Douro, Portugal, apresentam caroços de espiga de milho incorporados na camada de enchimento de paredes exteriores de tabique. Esta descoberta tem vindo a estimular o estudo do potencial da aplicação na construção civil deste resíduo agrícola. Um trabalho de investigação preliminar permitiu concluir que este produto natural apresen...
An integrated approach for modelling the tensile behaviour of steel fibre reinf...
Cunha, Vitor M. C. F.; Barros, Joaquim A. O.; Sena-Cruz, JoséThe present work resumes the experimental and numerical research carried out for the development of a numerical tool able of simulating the tensile behaviour of steel fibre reinforced self-compacting concrete (SFRSCC). SFRSCC is assumed as a two phase material, where the nonlinear material behaviour of SCC matrix is modelled by a 3D smeared crack model, and steel fibres are assumed as embedded short cables dist...
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