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Evaluation of code formulations for NSM CFRP bond strength of RC elements
Coelho, Mário R. F.; Sena-Cruz, José; Dias, Salvador J. E.; Miranda, Tiago F. S.This paper presents an analytical analysis which intends to verify the accuracy of existing code formulations for predicting the pullout strength of NSM CFRP systems applied to concrete. A database with a limited set of parameters was gathered and two code formulations were tested on it. Then, a new approach was tested. This uses Data Mining algorithms to develop models to predict the pullout strength based on ...
Efficiency of different techniques in flexural strengthening of RC beams under ...
Sena-Cruz, José; Barros, Joaquim A. O.; Coelho, Mário R. F.; Silva, Luís F. F. T.In the context of flexural strengthening of concrete structures, fiber reinforced polymers (FRP) have been used mostly by two main techniques: Externally Bonded Reinforcement (EBR) and Near-Surface Mounted (NSM). Both strengthening techniques are applied on the cover concrete, which is normally the weakest region of the element to be strengthened. Consequently, the most common problem is the premature failure o...
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...
Efficiency of different techniques in seismic strengthening of RC beam-column j...
Coelho, Mário R. F.; Fernandes, Pedro Miguel Gomes; Sena-Cruz, José; Barros, Joaquim A. O.In the last years several techniques have been proposed and used for the seismic strengthening of reinforced concrete (RC) beam-column joints using fiber reinforced polymers (FRP). The Near Surface Mounted (NSM) technique uses FRP bars or laminates inserted into grooves opened on the concrete cover and filled with epoxy adhesive. In the Mechanically Fastened and Externally Bonded Reinforcement (MF-EBR) techniqu...
Diferentes métodos de avaliação do comportamento da ligação de laminados de CFR...
Fernandes, Pedro Miguel Gomes; Silva, Patrícia; Sena-Cruz, José; Xavier, José; Coelho, Mário R. F.; Barros, Joaquim A. O.O presente trabalho pretende contribuir para o conhecimento da durabilidade da técnica baseada na inserção de laminados de CFRP (Carbon Fiber Reinforced Polymer) no betão de recobrimento (NSM, Near-Surface Mounted). Para isso, foram realizados trinta e cinco ensaios de arrancamento direto em provetes cúbicos previamente submetidos a ciclos de molhagem e secagem na presença de cloretos (NaCl). A monitorização do...
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