Under different ratios of CFRP confinement, the CFRP confined concrete cylinders have apparent size effect.
A secondary objective was to validate the wall panel design including the appropriate selection of axial force ratio and design of confinement and armouring details.
Nishiyama et al. (1993) reported that a 4% volumetric ratio of 800 MPa confinement steel was required to obtain ductile columns when concrete strength was 110 MPa (i.e. ρ s f yt/f c′ = 29%).
The influences of some parameters, such as span-to-height ratio, confinement ratio, rich degree of shear capacity, thickness of concrete cover, thickness of fire insulation, and strengthening ratio, on the tensile reinforcement ratio related to the critical situation are examined.
Sugano et al. (1990) as well as Razvi and Saatcioglu (1994), Saatcioglu and Razvi (1993) reported a correlation between the non-dimensional parameter of confinement ratio, (rho_{text{s}} f_{text{yt}} /f_{text{c}}^{{prime }}) and axial deformability of HSC columns subjected to concentric loads.
They related the fracture energy with increasing confinement up to a confinement ratio of 0.2.
The model is based on the results of a comprehensive experimental program including large-scale circular, square and rectangular short columns confined by carbon/epoxy and E-glass/epoxy jackets providing a wide range of confinement ratios.
