Identifying adjacent braced wall bands and determining the spacing of braced wall panels and braced wall bands is not complicated where the building plan is orthogonal or there are parallel braced wall bands: the adjacent braced wall band is the nearest parallel band. Figure Table A-9.23.13.5.-A illustrates spacing.
Spacing of Parallel Braced Wall Bands and Spacing of Braced Wall Panels
Identifying the adjacent braced wall band and the spacing between braced wall bands is more complicated where the building plan is not orthogonal.
Where the plan is triangular, all braced wall bands intersect with the subject braced wall band. The prescriptive requirements in Part 9 do not apply to these cases and the building must be designed according to Part 4 with respect to lateral load resistance.
Where the braced wall bands are not parallel, the adjacent band is identified as follows using Figure Table A-9.23.13.5.-B as an example:
1.
Determine the mid-point of the centre line of the subject braced wall band (A);
2.
Project a perpendicular line from this mid-point (B);
3.
The first braced wall band encountered is the adjacent braced wall band (C);
4.
Where the projected line encounters an intersection point between two braced wall bands, either wall band may be identified as the adjacent braced wall band (complex cases).
The spacing of non-parallel braced wall bands is measured as the greatest distance between the centre lines of the bands.
