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These settings affect the generation of hold-down forces from shear on shear wall segments.
Hold-down offset
Here you specify the value of the hold-down offset, that is, the distance between the end of a wall segment and where the hold-down is situated, for all walls in the structure.
If a value is entered that is greater than or equal to ½ a shear wall segment length, the program reverts to the original default value of 1.5” for that segment. It issues no warning in this case, it is evident only by the placement of the hold-down in elevation view and its position as listed in the Hold-down Design table.
Center of wall studs
If this check box is selected, then the hold-down offset is the centre of the end wall stud assembly that you input in Wall Input View or Opening Input View for each wall segment in the structure. Note that CSA O86 11.6.4.1 requires that you use the centre of the end studs as your hold-down offset for moment arm calculations,
Subtract offset…in moment arm calculation
This checkbox indicates whether the program subtracts the hold-down offset from the wall length when calculating the overturning moment arm.
This input is disabled as it is a required by CSA O86 9.5.6, which specifies centre-to-centre of end stud(s), implying subtraction of ½ the end stud width
Include joist depth…in moment arm calculation
This checkbox indicates whether the program includes the floor depth above the wall in the wall height h when calculating the overturning moment arm.
This input is disabled for as it is required to be included by CSA O86 (Figure 11.7).