Finite-Element Analysis of FRP-Reinforced Concrete Slab­–Column Edge Connections Subjected to Reversed-Cyclic Lateral Loads

Acknowledgments

Notation

b_o

perimeter of the critical section for punching shear;

b_o,0.5d

perimeter of the critical section for punching shear located at 0.5d from the column face;

b₁

width of the critical section in the direction of unbalanced moment;

b₂

width of the critical section perpendicular to b₁;

C₁

column width perpendicular to the free edge;

C₂

column width parallel to the free edge;

c_ts

tension stiffening factor;

d

average depth of slab;

E_F

modulus of elasticity of FRP reinforcement;

E_c

modulus of elasticity of concrete;

e

distance from centroid of the critical section to the point where maximum shear stress is being calculated;

$f_c^{\mathrm{\prime }}$

specified compressive strength of concrete;

f_t

concrete tensile strength;

G_F

fracture energy;

J

property of the critical shear section analogous to the polar moment of inertia;

k

initial stiffness;

k_EXP

experimental initial stiffness;

k_FEM

initial stiffness estimated by the FEM;

M_unb

unbalanced moment transferred between slab and column;

P_g

gravity lateral load;

P_g-EXP

experimental gravity lateral load;

P_g-FEM

gravity lateral load estimated by the FEM;

P_p

peak lateral load;

P_p-EXP

experimental peak lateral load;

P_p-FEM

peak lateral load estimated by the FEM;

P_u,CSA

lateral load capacity predicted by CSA S806-12 (CSA 2017);

P_u,E-E

lateral load capacity predicted by El-Gendy and El-Salakawy (2020c);

r_c,lim

reduction of compressive strength factor;

S_F

crack shear stiffness factor;

V_c

punching shear capacity provided by concrete;

V_g

gravity shear force transferred between the slab and the column;

v_c

shear stress resistance provided by concrete;

v_CSA

punching strength predicted by CSA S806-12 (CSA 2017);

v_E-E

punching strength predicted by El-Gendy and El-Salakawy (2020c);

v_FEM

punching strength estimated by the FEM;

w_d

critical compressive displacement;

α_s

dimensionless coefficient to account for the location of slab–column connections;

β_c

ratio of the long side to the short side of column;

γ_v

factor accounting for the portion of unbalanced moment transferred by eccentricity of shear;

δ

interstory drift ratio;

δ_p

peak drift ratio;

δ_p-FEM

peak drift ratio estimated by the FEM;

δ_u

ultimate drift ratio;

δ_u-EXP

experimental ultimate drift ratio;

δ_u-FEM

ultimate drift ratio estimated by the FEM;

λ

factor to account for concrete density;

µ

Poisson’s ratio of concrete;

ρ_F

longitudinal FRP reinforcement ratio;

ϕ

strength reduction factor; and

ϕ_c

resistance factor for concrete.

References