Mixed-Mode Debonding in CFRP-to-Steel Fiber–Reinforced Concrete Joints

Data Availability Statement

Acknowledgments

Notations

bc

width of the concrete;

b_p

width of the bonded plate;

c, d, e

parameter about the calculated value Δ_m;

c₀

cohesion;

c_f

constant determined in a linear regression analysis using the results of double shear or similar tests;

D

damage factor;

D_m

damage factor in mixed mode (Δ_n > 0);

D_s

damage factor in mixed mode (Δ_n < 0);

Ef

modulus of elasticity of the CFRP sheet;

f_t

average tensile strength of the SFRC;

$f_t^r$

normal relative stress;

Gf

fracture energy;

$G_{\mathrm{I}}^r$

energy release rate in Mode Ⅰ;

$G_{\mathrm{II}}^r$

energy release rate in Mode Ⅱ;

K_n

normal stiffness coefficient;

kp

geometrical factor related to the width of the bonded plate and the width of the concrete member;

l

bond length;

l_e

effective bond length;

P

experimental peel strength;

P_cal

calculate peel strength;

P_u

bond strength;

tp

CFRP sheet thickness;

${\tau }_0^r$

tangential relative stress;

Δ

displacement in mixed mode;

Δ₀

displacement corresponding to peak stress in mixed mode;

Δ_f

failure displacement in mixed mode;

Δ_m

effective relative displacement;

Δ_n

normal displacement;

Δ_n1

corresponding displacement when the stress is σ_c;

Δ_nf

normal failure displacement;

Δ_no

displacement corresponding to the normal peak stress;

${\mathrm{\Delta }}_{no}^r$

relative initial damage normal displacement;

Δ_s

tangential displacement;

Δ_s0

displacement corresponding to the peak tangential stress;

Δ_sf

tangential failure displacement;

${\mathrm{\Delta }}_{so}^r$

relative initial damage normal displacement;

σ

peeling stress;

σ_c

maximum compression stress of the fiber–concrete interface;

τ

tangential stress;

τ₀

peak tangential stress;

τ_max

peak shear stress of fiber; and

φ

angle of internal friction.

References