Effect of Load Eccentricity on the Mechanical Response of FRP-Confined Predamaged Concrete under Compression

Data Availability Statement

Notation

a, b

dimensionless constant in f_o model;

av

average value;

c, d

dimensionless constant in E_h model;

E

elastic modulus;

E_f

elastic modulus of FRP material;

E_h

hardening modulus of damaged concrete;

E_h,0

hardening modulus of damaged concrete when e = 0;

Ex_i

experimental data;

E₁

initial stiffness modulus of damaged concrete;

e

load eccentricity;

f_c

axial stress;

f_cd

peak remaining strength of unconfined predamaged concrete at point X in Fig. 1;

f_ci

stress at unloading point;

f_co

strength of undamaged concrete;

${\tilde{f}}_{cu}$

ultimate strength of damaged concrete at point Z in Fig. 1;

f_o

transition limit;

f_o,0

transition limit when e = 0;

i

number of experimental data;

k

curvature;

M

moment;

N

axial load;

N_c

ultimate load of FRP-confined predamaged concrete under concentric loading;

N_cd

peak axial load of the unconfined predamaged concrete;

N_ci

inflicted load at unloading point;

N_e

ultimate load of FRP-confined predamaged concrete under eccentric loading;

R

radius of the specimen;

Th_i

analytical result;

t

thickness of FRP;

w

integral absolute error;

δ

damage degree;

ɛ_c

axial strain;

ɛ_cd

peak axial strain of unconfined predamaged concrete at point X in Fig. 1;

ɛ_ci

strain at unloading point;

ɛ_co

peak axial strain of undamaged concrete at point P in Fig. 1;

ɛ_cu

ultimate strain of conventional FRP-confined concrete;

${\tilde{\epsilon }}_{cu}$

axial strain of damaged concrete at point Z in Fig. 1;

ɛ_f

strain at a loading position;

λ

stress excursion;

σ_l, σ_r

circumferential and radial stresses for cylinder specimens; and

ν_l, ν_r

Poisson's ratio in circumferential and radial directions.

References