Shear Performance of RC Beams Strengthened with Steel Strand Wire Mesh–Reinforced Engineered Cementitious Composites under Cyclic Loading

Data Availability Statement

Acknowledgments

Notation

A_f

cross-sectional area of the strand wire (mm²);

A_s

cross-sectional area of the stirrup (mm²);

A_sl

cross-sectional area of the longitudinal reinforcement (mm²);

a

shear span of the beam (mm);

b

width of the beam (mm);

D_f

strain distribution factor of the SSWM;

d

effective depth measured from the extreme compression fiber to the centroid of longitudinal tension bars (mm);

d_l

diameter of the longitudinal reinforcements (mm);

E_f

elastic modulus of the strand wire (GPa);

E_sl

elastic modulus of the longitudinal reinforcement (GPa);

E_sv

elastic modulus of the steel stirrup (GPa);

f_c

compressive strength of concrete (MPa);

f_ct

$0.395f_c^{0.55}=$ tensile strength of concrete (MPa);

f_ec

compressive strength of the ECC (MPa);

f_et

tensile strength of the ECC (MPa);

f_fe

effective stress of the SSWM under cyclic loading (MPa);

f_fu

ultimate tensile stress of the strand wire (MPa);

f_R

confinement pressure of the SSWM-ECC on concrete (MPa);

f_R,e

f_R carried by the ECC (MPa);

f_R,f

f_R carried by the SSWM (MPa);

f_sly

yielding strength of the longitudinal reinforcement (MPa);

f_svy

yielding strength of the stirrup (MPa);

h

depth of the beam (mm);

K_s

P/(δ_l-δ_lr) stiffness of the test beam (kN/mm);

k_R

confining coefficient of the SSWM-ECC-confined concrete;

n_f

number of strand wires within shear span;

P

applied load (kN);

P_cr

shear cracking load of the test beam (kN);

P_cr0

shear cracking load of the RC beam (kN);

P_u

ultimate load of the test beam (kN);

P_s

service load of the test beam corresponding to the maximum crack width of 0.4 mm (kN);

r

chamfer radius of the RC beam edges (mm);

s

spacing of stirrups (mm);

s_f

spacing of vertical strand wires (mm);

t

thickness of the ECC layer (mm);

V_a

shear strength carried by the modified arch model (kN);

V_a,c

shear strength of the concrete in the modified arch model (kN);

V_a,e

shear strength carried by ECC in the modified arch model (kN);

V_t

shear strength carried by the modified truss model (kN);

V_t,d

shear strength of longitudinal reinforcements in the modified truss model (kN);

V_t,e

shear strength carried by ECC in the modified truss model (kN);

V_t,f

shear strength carried by SSWM in the modified truss model (kN);

V_t,s

shear strength of the stirrups in the modified truss model (kN);

V_u

total shear strength of the test beam (kN);

V_u,ACI-549

predicted shear strength based on the ACI 549.4R-20 model (kN);

V_u,E

P_u/2 = experimental shear strength of the test beam (kN);

V_u,CNR-DT215

predicted shear strength based on the CNR DT215-18 model (kN);

V_u,JSCE

predicted shear strength based on the JSCE-08 model (kN);

V_u,p

predicted shear strength based on the model proposed in this study (kN);

V_u,TAM

predicted shear strength based on the unmodified truss arch model (kN);

β

angle between the arch axis and the horizontal direction (°);

δ_l

deflection of the test beam at the loading point (mm);

δ_lr

residual deflection of the test beam at the loading point (mm);

δ_u

ultimate deflection of the test beam (mm);

ε_fe

effective strain of the SSWM under cyclic loading;

ε_fe,Cai

effective strain of the SSWM based on Cai et al.’s (2021) model;

ε_fe,Guo

effective strain of the SSWM based on Guo et al.’s (2018) model;

ε_fe,JSCE

effective strain of the SSWM based on the JSCE-08 model;

ε_fe,p

effective strain of the SSWM based on the model proposed in this study;

ε_fu

ultimate tensile strain of the strand wire;

θ

angle between the diagonal crack and horizontal direction (°);

μ

(ψ_t/ψ_e + 1)/2 = energy-based ductility factor;

ν

(1.5−0.5a/d)/(0.7−f_c/200) = stress-softening coefficient of concrete;

ξ

(1−0.5 s/h)(1−0.25b/h) = effective truss coefficient considering the restraint of stirrups;

ρ_f

2A_f /(bs_f) = reinforcement ratio of vertical strand wire (%);

ρ_sv

2A_s/(bs) = reinforcement ratio of the stirrup (%);

τ_d

dowel stress of the longitudinal reinforcements (MPa);

ψ_e

elastic strain energy of test beam corresponding to ultimate load (kJ); and

ψ_t

energy absorption of the test beams (kJ).

References