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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...
Durability of steel fiber reinforced self-compacting concrete
Frazão, Cristina M. V.; Camões, Aires; Barros, Joaquim A. O.; Gonçalves, DelfinaPublicado em "Proceedings of the 5th International Conference on The Concrete Future", ISBN 978-981-07-6067-0 ; For conventional concrete without steel fibers, although still an aspect under discussion, there are some commonly used durability indicators. However, for steel fiber reinforced self-compacting concrete (SFRSCC) literature is sparse and the aspects of durability, particularly corrosion resistance, s...
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...
Influence of fatigue loading and environmental conditions on the bond behavior ...
Mendes, Pedro J. D.; Barros, Joaquim A. O.; Sena-Cruz, José; Taheri, MahsaTo assess the influence of fatigue loading and environmental conditions on the bond behavior between glass fiber reinforced polymer (GFRP) systems and steel fiber reinforced self-compacting concrete (SFRSCC) that are adhesively bonded, an experimental program composed of push-out tests was carried out. The following three scenarios were selected for the environmental conditions: natural conditions; wet-dry cycl...
Shear capacity of HPFRC beams flexurally reinforced with steel and prestressed ...
Soltanzadeh, Fatemeh; Mazaheripour, H.; Barros, Joaquim A. O.; Sena-Cruz, JoséThis paper presents the relevant results from an experimental program to assess the shear capacity of high performance fiber reinforced concrete (HPFRC) beams flexurally reinforced with a hybrid system of passive steel and prestressed GFRP longitudinal bars. Three series of two beams with different level of prestressing were tested. The effect of prestressing level on the shear capacity of the beams was the mai...
Assessment of the effectiveness of the embedded through-section technique for t...
Barros, Joaquim A. O.; Dalfré, GláuciaEmbedded Through-Section (ETS) technique is a relatively recent shear strengthening strategy for reinforced concrete (RC) beams, and consists on opening holes across the depth of the beam’s cross section, with the desired inclinations, where bars are introduced and are bonded to the concrete substrate with adhesive materials. To assess the effectiveness of this technique, a comprehensive experimental program...
Assessment of non linear bond laws for NSM systems in concrete elements
Ceroni, Francesca; Barros, Joaquim A. O.; Pecce, Marisa; Ianniciello, MarcoIn this paper the numerical FEM model developed to simulate the behaviour of the NSM strengthening system for concrete elements is presented. The plane model introduces the non linear bond law of the system by an interface element between the composite reinforcement and the concrete considered linear. The results of two experimental programs are analysed and used to calibrate the parameters of the bond shea...
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...
NSM technique to increase the load carrying capacity of continuous RC slabs
Dalfré, Gláucia; Barros, Joaquim A. O.This work presents and analysis the results of an ongoing research project on the use of the near surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) laminates for the increase of the load carrying capacity of statically indeterminate (two spans) reinforced concrete (RC) slabs. The test program consisted of seventeen slab strips, grouped in two series that are different on the adopted strengthening sch...
Reinforced concrete beams strengthened in shear with NSM CFRP laminates : asses...
Dias, Salvador J. E.; Barros, Joaquim A. O.To appraise the performance of the Near surface mounted (NSM) technique with carbon fiber reinforced polymer (CFRP) laminates for the shear strengthening of reinforced concrete (RC) beams having a certain percentage of existing steel stirrups, an extensive experimental research was carried out. The influence on the effectiveness of the NSM shear strengthening technique of the following parameters was investigat...
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