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Flexural and shear strengthening of RC elements
Dalfré, GláuciaTese de doutoramento em Engenharia Civil ; In a recent experimental program dealing with the Near Surface Mounted (NSM) technique for the flexural strengthening of continuous reinforced concrete (RC) slabs strips, the increase of load carrying and the moment redistribution was lower than the expected values. This experimental program was analysed in depth in this thesis and it was concluded that more efficien...
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...
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...
On the behaviour of continuous RC slab strips flexurally strengthened by the NS...
Dalfré, Gláucia; Barros, Joaquim A. O.This work explores the influence of the amount of CFRP in terms of load carrying capacity, ductility and moment redistribution capacity of continuous RC slab strips. In this way, for assessing the predictive performance of a FEM-based computer program, the experimental results obtained by Bonaldo (2008) and Dalfré (2013) were compared with values predicted by this software. Finally, a parametric study is carrie...
A model for the prediction of the behaviour of continuous RC slabs flexurally s...
Barros, Joaquim A. O.; Dalfré, GláuciaTo predict the load-deflection response up to the collapse of statically indeterminate reinforced concrete (RC) structures, an analytical model was developed and its predictive performance was appraised by using the data obtained in experimental programs. The proposed approach is based on the force method by establishing a number of displacement compatibility equations that can provide the unknown variables. To...
Model to simulate the behaviour of RC beams shear strengthened with ETS bars
Barros, Joaquim A. O.; Breveglieri, Matteo; Gouveia, A. Ventura; Dalfré, Gláucia; Aprile, AlessandraTo predict correctly the deformational and the cracking behavior of reinforced concrete elements failing in shear using a smeared crack approach, the strategy adopted to simulate the crack shear stress transfer is crucial. For this purpose, several strategies for modeling the fracture mode II were implemented in a smeared crack model already existing in the FEM-based computer program, FEMIX. Special development...
Sobre a utilização de varões embebidos para o reforço ao corte de vigas de betã...
Dalfré, Gláucia; Barros, Joaquim A. O.A técnica de reforço baseada na utilização de varões embebidos para o reforço ao corte de vigas de betão armado (BA), designada na literatura inglesa por “Embedded Through-Section (ETS)”, é relativamente recente e consiste na instalação de varões em furos abertos na espessura do elemento a reforçar, com inclinações desejadas, sendo fixos ao betão por meio de adesivos. Para avaliar a eficácia desta técnica, um p...
Flexural and shear strengthening of reinforced concrete elements
Dalfré, Gláucia; Barros, Joaquim A. O.This work focuses on research carried out on the use of the near surface mounted (NSM) technique to increase the flexural capacity of statically indeterminate reinforced concrete (RC) slabs or shallow beams, and the use of embedded through-section (ETS) bars for shear strengthening of these structures.
Steel bar - concrete bond behaviour in the context of the ETS shear strengtheni...
Dalfré, Gláucia; Barros, Joaquim A. O.The use of near-surface mounted (NSM) technique has been proved to be very effective to increase the flexural and shear resistance of reinforced concrete (RC) beams. However, the NSM is not applicable for the shear strengthening of RC slab, thus a new technique was developed (ETS – Embedded Through-Section), consisting in opening holes across the slab thickness in the shear zone, where bars are inserted and bon...
The contribution of embedded through-section bars for the shear resistance of RC
Dalfré, Gláucia; Barros, Joaquim A. O.; Breveglieri, Matteo; Aprile, AlessandraIn a recent experimental program, the performance of a novel shear strengthening technique, designated by Embedded Through-Section (ETS), was appraised by performing a series of beam bending tests composed of eight reinforced concrete (RC) beams. According to this strengthening technique, holes are opened through the beam’s section, with the desired inclinations, and bars are introduced into these holes an...
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