Compressive Behavior of Composite Concrete Columns with Encased FRP Confined Concrete Cores

A composite concrete column with encased fiber reinforced polymer (FRP) confined concrete cores (EFCCC) is proposed in this paper. The cross-sectional form of the EFCCC column is composed of several orderly arranged FRP confined concrete cores (FCCCs) surrounding a filled core concrete. This novel composite column has several advantages, such as higher compressive capacity, stronger FRP confinement, and ductile response. The compressive experiment is employed to investigate the compressive behavior of the EFCCC column with deferent parameters, such as outside concrete and stirrups. Test results show that the main failure mode of the EFCCC column with and without an outside concrete or stirrups is tensile fracture of the glass fiber reinforced polymer (GFRP) tubes. Compared to a reinforced concrete (RC) column, the strength and ductility of the EFCCC column was obviously improved by 20% and 500%, respectively. A finite element model (FEM) based on the Drucker–Prager (D-P) was developed that can accurately predict the axial compression behavior of the composite column with FRP confined concrete core. The predicted results obtained by using this FEM have excellent agreement with the experimental results.

[1]  Yufei Wu,et al.  Effect of corner radius on the performance of CFRP-confined square concrete columns: Test , 2008 .

[2]  Q. Khan,et al.  Concrete Filled Carbon FRP Tube (CFRP-CFFT) columns with and without CFRP reinforcing bars: Axial-flexural interactions , 2018 .

[3]  J. Teng,et al.  Design-Oriented Stress-Strain Model for FRP-Confined Concrete in Rectangular Columns , 2003 .

[4]  Peng Feng,et al.  Load-Strain Model for Steel-Concrete-FRP-Concrete Columns in Axial Compression , 2016 .

[5]  Yu Bai,et al.  Mechanical behavior of concrete-filled square steel tube with FRP-confined concrete core subjected to axial compression , 2015 .

[6]  Cheuk Lun Chow,et al.  Long term performance and fire safety aspect of FRP composites used in building structures , 2016 .

[7]  R. Masmoudi,et al.  Axial behavior of circular CFFT long columns internally reinforced with steel or carbon and glass FRP longitudinal bars , 2018 .

[8]  F. Peng.  DEFORMABILITY AND NEW PERFORMANCE INDICES OF FLEXURAL MEMBERS , 2005 .

[9]  Amir Mirmiran,et al.  Tests and modeling of carbon-wrapped concrete columns , 2000 .

[10]  Yan Xiao,et al.  Compressive Behavior of Concrete Confined by Carbon Fiber Composite Jackets , 2000 .

[11]  M. Tabbara,et al.  Confinement Effectiveness in Rectangular Concrete Columns with Fiber Reinforced Polymer Wraps , 2005 .

[12]  Yu-Fei Wu,et al.  Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns , 2010 .

[13]  E. Oller,et al.  Contribution of externally bonded FRP shear reinforcement to the shear strength of RC beams , 2019, Composites Part B: Engineering.

[14]  Tao Yu,et al.  Finite element modeling of confined concrete-I: Drucker–Prager type plasticity model , 2010 .

[15]  Marta Del Zoppo,et al.  FRP for seismic strengthening of shear controlled RC columns: Experience from earthquakes and experimental analysis , 2017 .

[16]  Fang Yuan,et al.  Behaviour of Hybrid Steel and FRP-Reinforced Concrete—ECC Composite Columns under Reversed Cyclic Loading , 2018, Sensors.

[17]  Togay Ozbakkaloglu,et al.  Compressive behavior of concrete-filled FRP tube columns: Assessment of critical column parameters , 2013 .

[18]  P. Sadeghian,et al.  Performance of high-modulus near-surface-mounted FRP laminates for strengthening of concrete columns , 2019, Composites Part B: Engineering.

[19]  D. Mostofinejad,et al.  Effect of corner radius and aspect ratio on compressive behavior of rectangular concrete columns confined with CFRP , 2015 .

[20]  F. Yuan,et al.  Effect of Interfacial Bond on Plastic Hinge Length of FRP-Confined RC Columns , 2019, Journal of Composites for Construction.

[21]  M. Chellapandian,et al.  Axial compression–bending interaction behavior of severely damaged RC columns rapid repaired and strengthened using hybrid FRP composites , 2019, Construction and Building Materials.

[22]  M. Sheikh,et al.  Behaviour of concrete-encased concrete-filled FRP tube (CCFT) columns under axial compression , 2017 .

[23]  A. Mirmiran,et al.  Effect of Column Parameters on FRP-Confined Concrete , 1998 .

[24]  T. Ozbakkaloglu,et al.  Influence of fiber orientation and specimen end condition on axial compressive behavior of FRP-confined concrete , 2013 .

[25]  A. Ashour,et al.  Review of Current Design Guidelines for Circular FRP-Wrapped Plain Concrete Cylinders , 2016 .

[26]  A. Mirmiran,et al.  Nonlinear finite element modeling of concrete confined by fiber composites , 2000 .

[27]  J. Teng,et al.  Design-oriented stress–strain model for FRP-confined concrete , 2003 .

[28]  Ian D. Shaw,et al.  Repair of damaged end regions of PC beams using externally bonded FRP shear reinforcement , 2017 .

[29]  Carlo Pellegrino,et al.  Behavior of RC beams strengthened in shear with FRP and FRCM composites , 2017 .