Numerical model for CFRP confined concrete elements subject to monotonic and cyclic loadings

Abstract

Uniaxial 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 assessed. A uniaxial stress-strain constitutive model is proposed, and the results obtained from the experimental tests were used to calibrate some of the parameters of this model, and to appraise the model performance. This model allows the simulation of reinforced concrete members by using Timoshenko one-dimensional elements, in the context of the finite element method (fibre model). Good agreement was obtained between numerical simulations and experimental results for both monotonic and cyclic loading tests.

Concentrically Loaded Circular RC Columns Partially Confined with FRP

“…The nonlinearity leads to a complex model for the confined concrete stressstrain relationship. In order to simplify model, the assumption of a linear relationship generated results that are in very good agreement with experimental ones (Demers and Neale 1999;Rocca et al 2006;Varma et al 2009;Lee et al 2010). Consequently, a linear relationship between f c,sy and f ′ c , and f c,fy and f ′ c is adopted in the proposed model.…”

“…The proposed model is also compared with experimental results for fully wrapped circular columns in Fig. 11 (30) (Demers and Neale 1999;Lee et al 2010) and partially wrapped columns (Rocca et al 2006;Varma et al 2009) in Fig. 12.…”

Load-Bearing Capacity of Compressed Concrete Elements Subjected to Repeated Load Strengthened With CFRP Materials

“…However, there are no accurate results of investigations and analyses of cyclic load influence on compressed elements strengthened with FRP composites. Nowadays, pioneer publications concerning these issues have started to emerge (Ozbakkaloglu et al 2008;Shao et al 2006;Varma et al 2009), but there is still no exhaustive information on interaction of concrete core and external strengthening. Concurrently with the experimental studies, the σ-ε model of FRP strengthened concrete subjected to cyclic load is being developed (Shao et al 2006).…”

“…Concurrently with the experimental studies, the σ-ε model of FRP strengthened concrete subjected to cyclic load is being developed (Shao et al 2006). Varma et al (2009) carried out a comparative analysis of cyclic and monotonic compression of reinforced concrete elements fully or partially confined with a CFRP sheet. 54 specimens were tested, each with diameter of 200 mm and height of 600 mm.…”

Effects of Steel Ratio on the Behavior of Reinforced Concrete Column Confined With Carbon Fiber Reinforced Polymer Composties Under Axial Load

“…It can be used to significantly increase the carrying capacity of the load and dissipate the energy of circular concrete columns. CFRP sheets has a remarkable properties, Such as high strength, easy to install and low weight, make it very suitable for the reinforced concrete (RC) columns confinement [5].…”