Path-Dependent Stress–Strain Model for FRP-Confined Recycled Brick Aggregate Concrete

Acknowledgments

Notation

D

diameter of a concrete cylinder;

E_c

elastic modulus of unconfined concrete;

E_frp

elastic modulus of FRP;

$f_{cc}^{\mathrm{\prime }}$

compressive strength of FRP-confined concrete;

$f_{cc}^{\mathrm{\prime }\ast }$

compressive strength of actively confined concrete;

$f_{co}^{\mathrm{\prime }}$

compressive strength of unconfined concrete;

f_frp

tensile strength of an FRP coupon;

H

height of a concrete cylinder;

k₁

confinement effectiveness coefficient;

q

coefficient in the active-confinement base model;

r

volume replacement ratio of recycled brick aggregate;

t

testing time;

t_frp

thickness of an FRP wrap;

α

confining pressure ratio;

β

axial stress ratio;

ɛ_c

axial strain of concrete;

${\epsilon }_{cc}^{\ast }$

axial strain at compressive strength of actively confined concrete;

ɛ_c,i

axial strain at the intersection of a lateral strain–axial strain curve of actively confined concrete and that of FRP-confined concrete;

ɛ_co

axial strain at compressive strength of unconfined concrete;

ɛ_cu

ultimate axial strain of FRP-confined concrete;

ɛ_h

hoop strain of an FRP wrap;

ɛ_h,rup

hoop rupture strain of an FRP wrap;

ɛ_frp

ultimate tensile strain of an FRP coupon;

ɛ_l

lateral strain of concrete;

σ_c

axial stress of concrete;

${\sigma }_c^{\ast }$

axial stress of actively confined concrete at ɛ_c,i;

σ_l

confining pressure;

${\sigma }_l^{\ast }$

confining pressure of actively confined concrete;

${\sigma }_l^t$

target confining pressure of actively confined specimens;

σ_l,f

FRP confining pressure at ɛ_c,i; and

σ_c,f

axial stress of FRP-confined concrete at ɛ_c,i.

References