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Design-curves of strain softening and strain hardening fibre reinforced concret...
Varma, R. K.; Barros, Joaquim A. O.; Sena-Cruz, JoséSeveral structural components made by fibre reinforced concrete (FRC) are submitted to axial load and bending moments. In some cases fibres cannot replace completely the conventional reinforcement, even if strain hardening FRC is used; therefore the optimization of the reinforcement solution for these elements depends on the post-cracking behaviour of the FRC, as well as the percentage of conventional reinforce...
CFRP - Confined reinforced concrete elements subjected to cyclic compressive lo...
Barros, Joaquim A. O.; Ferreira, Débora R. S. M.; Varma, R. K.The effectiveness of discrete and continuous CFRP wrapping arrangements for reinforced concrete (RC) short column subjected to monotonic and cyclic compressive loading is assessed in this work. The experimental program is composed of four series of RC columns with discrete wrapping arrangements and one series of full wrapped RC columns. Each series is composed of a monotonic and a cyclic test. Strain gauges wer...
Numerical model for CFRP confined concrete elements subject to monotonic and cy...
Varma, R. K.; Barros, Joaquim A. O.; Sena-Cruz, JoséUniaxial cyclic and monotonic compression tests were carried out on partially and fully wrapped concrete cylinders with Carbon Fibre Reinforced Polymer (CFRP) wet lay-up sheets. The influence of the concrete compressive strength, CFRP stiffness, geometric confinement arrangement and loading type on the compressive behaviour of reinforced concrete column elements of circular cross section up to their failure was...
Cost competitive steel fibre reinforced self-compacting concrete for structural...
Barros, Joaquim A. O.; Lourenço, Lúcio; Varma, R. K.; Gonçalves, DelfinaThe present work resumes the research carried out to develop a cost competitive Steel Fibre Reinforced Self-Compacting Concrete (SFRSCC) for structural applications, such is the case of lightweight panels for building facades. A mix design method was developed taking into account the influence that fibres introduce in the skeleton phase of the composition. The concrete precast industry is one of the most suited...
Near surface mounted CFRP strips for the flexural strengthening of RC columns :...
Barros, Joaquim A. O.; Varma, R. K.; Sena-Cruz, José; Azevedo, Álvaro F. M.In the present work, a strengthening technique based on near surface mounted (NSM) carbon fibre laminate strips bonded into slits opened on the concrete cover is used to improve the flexural capacity of columns subjected to bending and compression. This technique avoids the occurrence of the peeling phenomenon, is able to mobilize the full strengthening capacity of the strips, and provides higher protection aga...
A model to simulate the cyclic axial compressive behavior of RC columns confine...
Varma, R. K.; Barros, Joaquim A. O.; Sena-Cruz, José; Ferreira, Débora R. S. M.In the present work a constitutive model to predict the cyclic axial compressive behavior of RC columns confined with CFRP is proposed. This model was implemented in a FEM-based computer program, able to simulate the material nonlinear behavior of reinforced concrete frame structures. The performance of the developed model is assessed using results obtained from experimental tests.
Fibrous model for the simulation of the cyclic behaviour of 3D reinforced concr...
Varma, R. K.; Barros, Joaquim A. O.; Sena-Cruz, JoséRelatório 07-DEC/E-04 ; Non-linear finite element analysis has attracted a lot of attention in last few decades, as real life problems dealing with analysis of concrete beams and columns are generally non-linear in nature. This project deals with non-linear analysis of beam and columns, using Timoshenko beam theory. The Timoshenko beam theory is applied to every element, but before applying the theory the elem...
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