Encontrados 15 documentos, a visualizar página 1 de 2
Comportamento à fadiga de elementos de betão reforçados através de sistemas NSM...
Fernandes, Pedro Miguel Gomes; Silva, Patrícia; Sena-Cruz, José; Azenha, Miguel; Barros, Joaquim A. O.O presente trabalho tem como objetivo principal contribuir para o conhecimento do comportamento a longo prazo de estruturas de betão reforçadas de acordo com a técnica NSM (Near-Surface Mounted). O comportamento a longo prazo das estruturas reforçadas é afetado pelas condições ambientais, tais como gelo/degelo, ciclos térmicos, exposição a agentes químicos agressivos e radiação ultra violeta. Além disso, o comp...
Creep behavior of concrete elements strengthened with NSM CFRP laminate strips ...
Sena-Cruz, José; Silva, Patrícia; Fernandes, Pedro Miguel Gomes; Azenha, Miguel; Barros, Joaquim A. O.; Sousa, Christoph; Castro, FernandoThe present work intends to contribute for the knowledge on the long-term deformational performance of concrete structures strengthened with the near-surface mounted (NSM) technique. For that purpose a wide experimental program has been initiated using beam pullout and slab specimens submitted to sustained loads under the following environmental conditions: (i) 20ºC temperature and 55% relative humidity; (ii) i...
Back analysis of geomechanical parameters in underground works using an evoluti...
Moreira, Nuno Ricardo Vilaça; Miranda, Tiago F. S.; Pinheiro, Marisa da Mota; Fernandes, Pedro Miguel Gomes; Dias, Daniel; Costa, L.; Sena-Cruz, JoséThe purpose of this work is to evaluate the performance of an optimization algorithm from the field of evolutionary computation, namely an Evolution Strategy, in back analysis of geomechanical parameters in underground structures. This analysis was carried out through a parametric study of a synthetic case of a tunnel construction. Different combinations of parameters and measurements were carried out to test t...
Creep behavior of RC slabs strengthened NSM CFRP laminate strips under differen...
Sena-Cruz, José; Silva, Patrícia; Fernandes, Pedro Miguel Gomes; Azenha, Miguel; Barros, Joaquim A. O.; Sousa, Christoph; Teixeira, Tiago André NunesWith the aim of analyzing the long-term deformational performance of concrete elements flexurally strengthened with the near-surface mounted (NSM) technique, an experimental program has been launched using slab specimens submitted to sustained loads under the following environmental conditions: (i) 20ºC temperature and 55% relative humidity; (ii) immersed in water tank at 20ºC with 0% of chlorides; (iii) immers...
Bond behavior between concrete and multi-directional CFRP laminates using the M...
Coelho, Mário R. F.; Fernandes, Pedro Miguel Gomes; Sena-Cruz, José; Barros, Joaquim A. O.The strengthening technique based on the application of multi-directional laminates of CFRP (MDL-CFRP) simultaneously glued and anchored to the surface of the elements to be strengthened has been recently proposed. This technique was designated Mechanically Fastened and Externally Bonded Reinforcement (MF-EBR) and combines the fasteners from the MF-FRP technique with the externally glued properties from the EBR...
Reforço de elementos de betão armado com recurso a laminados de CFRP multidirec...
Sena-Cruz, José; Barros, Joaquim A. O.; Coelho, Mário R. F.; Fernandes, Pedro Miguel Gomes; Silva, PatríciaA aplicação de polímeros reforçados com fibras (Fiber Reinforced Polymers – FRP) no reforço de estruturas de betão armado (BA) tem sido realizada, essencialmente, com recurso às técnicas de colagem externa de mantas ou faixas de laminado e de inserção de laminados ou varões no betão de recobrimento. No âmbito do projeto de investigação em que este trabalho se insere pretendeu-se avaliar as potencialidades de um...
Bond behaviour of concrete elements strengthened with NSM CFRP laminate strips ...
Sena-Cruz, José; Fernandes, Pedro Miguel Gomes; Silva, Patrícia; Xavier, J.; Barros, Joaquim A. O.; Coelho, Mário R. F.In the last years, the near-surface mounted (NSM) technique has been adopted to increase the load carrying capacity of concrete members. Up to now, research was mainly focused on the structural aspects of NSM strengthening of concrete structures. From an extensive bibliographic search performed, no significant information was found concerning to the NSM long-term performance. The present work has the main objec...
Seismic strengthening of beam-column joints with multidirectional CFRP laminates
Coelho, Mário R. F.; Fernandes, Pedro Miguel Gomes; Melo, José; Sena-Cruz, José; Varum, Humberto; Barros, Joaquim A. O.; Costa, AníbalAn experimental program was carried out to analyse the potentialities of a technique based on the use of multidirectional CFRP laminates (MDL-CFRP) for the seismic repair and strengthening of reinforced concrete (RC) beam-column joints. This experimental program comprises cyclic tests on three full-scale RC joints, representative of interior beam-column connections in buildings. The joints were initially submit...
Bond between multidirectional laminates of CFRP and concrete
Coelho, Mário R. F.; Fernandes, Pedro Miguel Gomes; Sena-Cruz, José; Barros, Joaquim A. O.The Mechanically Fastened and Externally Bonded Reinforcement (MF-EBR) technique has been proposed for the strengthening of reinforced concrete (RC) structures. This retrofit system uses multidirectional carbon fibre reinforced polymer (CFRP) laminates fixed to concrete with epoxy adhesive and metallic anchors. With the aim of studying the bond behaviour of the MF-EBR system and compare with some existing ones,...
Seismic retrofit of RC beam-column joints using the MF-EBR strengthening technique
Coelho, Mário R. F.; Fernandes, Pedro Miguel Gomes; Melo, José; Sena-Cruz, José; Varum, Humberto; Barros, Joaquim A. O.; Costa, AníbalThe strengthening technique based on the use of multi-directional laminates of CFRP simultaneously glued and fixed with anchors (MF-EBR) has been recently purposed. An experimental program composed of pullout tests was carried out in order to study the bond behavior between concrete and MF-EBR system. The diameter and number of anchors, the pre-stress level applied to the anchors, and the strengthening procedur...
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