Minimum and Maximum Vertical Bar Diameter

There are no code provisions, but user defined limits can be applied to the minimum and maximum bar diameters - specified in Design Options > Wall > Reinforcement Layout

Minimum and Maximum Vertical Loose Bar Spacing

Limiting minimum horizontal spacing of the vertical bars, _sv,lim,min is controlled by the diameters of the 2 adjacent bars and aggregate size¹.

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Limiting maximum horizontal spacing of the vertical bars, sv,lim,max is controlled by the wall thickness.

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You are given control over these values by specifying minimum and maximum spacing limits in Design Options > Wall > Reinforcement Layout.

Minimum and Maximum Reinforcement Area

The code provisions which control the vertical reinforcement area are,

• Limiting minimum ratio of vertical reinforcement area to gross concrete area, rv,lim,min
• Limiting maximum ratio of vertical reinforcement area to gross concrete area, rv,lim,max

The controlling values are:

IF d_bv ≤ No. 5 (No. 16) with f_y ≥ 60,000 psi (420 MPa) OR WWR ≤ W31 or D31

then ρ_v,lim,min = 0.0012 else 0.0015 for all other deformed bars

Total minimum area of vertical reinforcement, A_s,min = ρ_v,lim,min*A_cg

Total maximum area of vertical reinforcement, A_s,max = ρ_v,lim,max*A_cg = 0.08*A_cg

where A_cg = Gross area of the concrete wall.

Where 2 layers are specified, this should be distributed equally to each face.

You are given further control over the minimum and maximum reinforcement ratio values via user limits in Design Options > Wall > Reinforcement Layout. These will be used if they are more onerous than the code limits.