Axial-Impact Resistance of Geopolymeric Recycled Aggregate Concrete Confined with Glass FRP Tubes

Data Availability Statement

Acknowledgments

Notation

A

cross-sectional area of the Hopkinson bar (m²);

A_s

cross-sectional area of the specimen (m²);

C₀

propagation velocity of the stress wave in the Hopkinson bar (m/s);

C_S

propagation velocity of the stress wave in the specimen (m/s);

d

diameter of the GFRP tube (mm);

E

elastic modulus of the Hopkinson bar (MPa);

E_frp

elastic modulus of the GFRP tube (MPa);

f_co,d

dynamic compressive strength of the unconfined specimen (MPa);

f_co,s

quasi-static compressive strength of the unconfined specimen (MPa);

f_cu,d

dynamic compressive strength of the confined specimen (MPa);

f_cu,s

quasi-static compressive strength of the confined specimen (MPa);

f_l

nominal lateral confining pressure of the GFRP tube (MPa);

L_s

specimen thickness (m);

n

number of reflections;

t_frp

thickness of the GFRP tube (mm);

α

constant parameter in the model of Xie et al. (2022a);

α_s

constant parameter in the model of Liu et al. (2018);

β

constant parameter in the model of Xie et al. (2022a);

γ_s

constant parameter in the model of Liu et al. (2018);

${\epsilon }_{\mathrm{frp}}$

ultimate tensile strain of the GFRP tube;

${\epsilon }_i(t)$

incident strain wave;

${\epsilon }_r(t)$

reflected strain wave;

${\epsilon }_t(t)$

transmitted strain wave;

${\epsilon }_s(t)$

time history of the specimen strain;

$\dot{\epsilon }$

strain rate (s⁻¹);

${\dot{\epsilon }}_0$

constant parameter in proposed models $({\dot{\epsilon }}_0={10}^{-6}{\mathrm{s}}^{-1})$;

${\dot{\epsilon }}_s$

constant parameter in the model of Liu et al. (2018) $({\dot{\epsilon }}_0=3\times {10}^{-5}{\mathrm{s}}^{-1})$;

${\dot{\epsilon }}_{c0}$

constant parameter in the model of fib Model Code 2010 $({\dot{\epsilon }}_0=30\times {10}^{-6}{\mathrm{s}}^{-1})$;

${\dot{\epsilon }}_s(t)$

time history of specimen strain rate (s⁻¹);

η_RA

parameter related to the RA replacement ratio;

ρ

density of the Hopkinson bar (kg/m³);

σ_s(t)

time history of the specimen stress (MPa);

$\sigma ({\epsilon }_c)$

function relationship between the stress and strain of the specimen (MPa);

τ

linearly increasing time of the incident wave (s); and

ω

energy absorption capacity of the specimen (MJ/m³).

References