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A _sh = Transverse reinforcement area (rectangular section) [mm ² ]
A _os = Area of ​​transverse reinforcement (circular section) [mm ² ]
a _i = Distance between the axes of longitudinal reinforcement supported by a stirrup arm horizontally [mm]
b _o = core concrete Section size between the axes of the winding stirrups [mm]
b _k = Core size (distance between the outermost transverse reinforcement axes) [mm]
D = Distance between spiral / coil reinforcement axes [mm], [Equation (5.4e)]
d_b = Diameter of longitudinal reinforcement (average attensileat tensile) [m]
f _ce = Average (expected) compressive strength of concrete [MPa]
f _ck = Characteristic compressive strength of concrete [MPa]
f _ywe = Average (expected) yield strength of transverse reinforcement [MPa]
h _o = Cross section size between the axes of stirrups surrounding the core concrete [mm]
L _p = Plastic hinge length [m]
L _s = Shear clearance [m]
s = Confinement reinforcement spacing [m]
α_se = Coefficient of efficiency of confinement reinforcement
ϕ _{y= Yield curvature [m ^-1 ]
ϕ u= Shear curvature [m ^-1 ]
ω we = Mechanical reinforcement ratio of effective confinement reinforcement
ρ sh = Volumetric ratio of transverse reinforcement in the direction considered
ε c ^(GÖ) = Prevention of immigrants to the permitted performance level limit wound contraction concrete units
ε s ^(GO) = Prevention migrant reinforcement steel unit strain allowed for the performance level of the boundary}

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(b) Unit deformation for reinforcement steel for the Preventing Migration performance level:

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Here ε _water indicates the unit elongation corresponding to the _water tensile strength (See. TBDY ANNEX 5.A ).

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