Experimental Investigation of Large-Scale Eccentrically Loaded GFRP-Reinforced High-Strength Concrete Columns

Acknowledgments

Notation

A_fc

area of GFRP reinforcement in compression (mm²);

A_ft

area of GFRP reinforcement in tension (mm²);

A_g

gross area of the column cross section (mm²);

D

diameter of the column cross section (mm);

d_fc

distance from the compression force to the neutral axis (mm);

d_ft

distance from the tension force to the neutral axis (mm);

e

load eccentricity (mm);

E_fc

modulus of elasticity in compression (GPa);

E_ft

modulus of elasticity in tension (GPa);

F_C

concrete compression force (kN);

F_fc

compression force in the GFRP bars (kN);

F_ft

tension force in the GFRP bars (kN);

f_c

stress in the concrete (MPa);

$f_c^{\mathrm{\prime }}$

maximum concrete stress obtained from testing standard concrete cylinders (MPa);

K_n

normalized axial load factor;

k

effective length factor (controlled by column boundary conditions);

ℓ

unbraced length of the column (mm);

M_C

moment from the compression force in concrete (kN · m);

M_fc

moment from the compression force in GFRP reinforcement (kN · m);

M_ft

moment from the tension force in GFRP reinforcement (kN · m);

M_n

nominal bending moment (kN · m);

M_u

experimental ultimate moment (kN · m);

P_n

nominal axial load (kN);

P_u

experimental ultimate axial load (kN);

R_n

normalized moment factor;

r

radius of gyration (mm);

δ

lateral deflection of the column (mm);

ɛ_c

strain in concrete;

ɛ_fc

measured compressive strain;

ɛ_ft

measured tensile strain;

ɛ_o

strain in concrete corresponding to $f_c^{\mathrm{\prime }}$;

λ

slenderness ratio, defined as kℓ/r;

ρ_f

GFRP longitudinal reinforcement ratio; and

ρ_fs

GFRP transverse reinforcement ratio.

References