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Punching shear reinforcement

Area of punching shear reinforcement on one perimeter around the column, and the outer perimeter where none is needed. Reference: EN 1992-1-1 6.4.5.

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# Inputs
v_Ed := 0.92 MPa
v_Rdc := 0.62 MPa
u_1 := 4614 mm
d := 240 mm
s_r := 180 mm
f_ywk := 500 MPa
gamma_s := 1.15
beta := 1.15
V_Ed := 850 kN

# Reinforcement
f_ywd.ef := min(250 MPa + 0.25*d/(1 mm)*1 MPa, f_ywk/gamma_s) =
A_sw := (v_Ed - 0.75*v_Rdc)*s_r*u_1/(1.5*f_ywd.ef) = mm^2

# Outer perimeter
u_out := beta*V_Ed/(v_Rdc*d) = mm

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