Encontrados 26 documentos, a visualizar página 1 de 3
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...
Confinamento de pilares de betão armado reforçados total e parcialmente com man...
Ferreira, Débora R. S. M.; Barros, Joaquim A. O.No sentido de contribuir para o aumento do conhecimento no âmbito do confinamento com sistemas de CFRP de elementos de pilar submetidos a carregamentos cíclicos de compressão, foi efectuado um programa experimental, cujos resultados são apresentados e analisados no presente trabalho.
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.
Stress-strain model for partial CFRP confined concrete
Ferreira, Débora R. S. M.; Barros, Joaquim A. O.Concrete columns requiring strengthening intervention always contain a certain percentage of steel hoops. Applying strips of wet lay-up carbon fiber reinforced polymer (CFRP) sheets in-between the existent steel hoops might, therefore, be an appropriate confinement technique with both technical and economic advantages, when full wrapping of a concrete column is taken as a basis of comparison. To assess the effe...
Assessing the efficiency of CFRP discrete confinement systems for concrete colu...
Barros, Joaquim A. O.; Ferreira, Débora R. S. M.Concrete columns requiring strengthening intervention always contain a certain percentage of steel hoops. Applying strips of wet lay-up carbon fiber reinforced polymer (CFRP) sheets in-between the existent steel hoops might, therefore, be an appropriate confinement technique with both technical and economic advantages, when full wrapping of a concrete column is taken as a basis of comparison. To assess the effe...
Nova abordagem no reforço de estruturas com materiais compósitos
Barros, Joaquim A. O.; Sena-Cruz, José; Dias, Salvador J. E.; Ferreira, Débora R. S. M.; Fortes, AdrianoNeste trabalho apresentam-se os resultados mais significativos da investigação experimental realizada para avaliar o desempenho de uma técnica de reforço baseada na fixação de laminados de CFRP em ranhuras efectuadas no betão de recobrimento de elementos estruturais. Com esta técnica foram reforçados e ensaiados elementos de pilar e de viga de betão armado com rotura por flexão, e vigas de betão armado com rotu...
CFRP-based confinement strategies for RC columns-experimental and analytical re...
Ferreira, Débora R. S. M.; Barros, Joaquim A. O.The present work aims to compare the confinement effectiveness of full and partial wrapping of concrete elements under compression loads. The main results of the experimental program are presented and analysed. The Lam and Teng analytical model was applied to predict the compression stress-strain behaviour of concrete column elements partially confined by strips of CFRP lay-up sheets. The model performance is a...
Confinement efficacy of partially and fully wrapped CFRP systems in RC column p...
Ferreira, Débora R. S. M.; Barros, Joaquim A. O.Since the beginning of the nineties, fibre reinforced polymers (FRP) have been used to increase the load carrying capacity and the energy absorption capacity of reinforced concrete columns [1-5]. The high specific strength and stiffness, the low thickness and weight, and the high resistance to corrosion of FRP materials are favourable properties justifying the increase use of these composites in the structural ...
Elementos de pilar de betão armado confinados com sistemas de cfrp submetidos a...
Ferreira, Débora R. S. M.; Barros, Joaquim A. O.Para avaliar a influência do carregamento cíclico de compressão no comportamento de provetes de betão armado confinados com sistemas discretos e contínuos em manta de CFRP, efectuou-se um programa experimental constituído por ensaios cíclicos e monotónicos de compressão directa. A influência dos ciclos de carga/descarga na evolução da rigidez da resposta tensão-extensão e na extensão nos sistemas de confinament...
Assessing the effectiveness of embedding CFRP laminates in the near surface for...
Barros, Joaquim A. O.; Ferreira, Débora R. S. M.; Fortes, Adriano; Dias, Salvador J. E.The authors of the present work wish to acknowledge the support provided by the S&P, Bettor MBT Portugal, Secil, Nordesfer, Ferseque, Casais, Solusel, VSL, Unibetão (Braga) and the colaboration of Cemacom. ; Near Surface Mounted (NSM) is a recent strengthening technique based on bonding Carbon Fiber Reinforced Polymer (CFRP) bars (rods or laminate strips) into pre-cut grooves on the concrete cover of the eleme...
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