Explaination for C and C Zones attached?

[engreg]

The roof attached is the one that fits the one I am designing for. The height is roughly 30'. I am not used to designing with this 0.6h number for what I would normally call "a" which is the minimum of 0.1 L and 0.4 H. This 0.6H from both sides will make the entire building a corner zone. Is this how you guys read it. Similarly, zone 3 becomes massive. Has anyone come to any conclusions about this isometric. The ultimate question I am trying to answer is what values to use for "a", "b", and "c". "a" is simple as mentioned before "b" and "c" become massive when using this drawing.

 

[jjl317]

attachment?

 

[engreg]

attached now.

 

[jjl317]

And which document is this from? Doesn't look familiar.

 

[engreg]

ASCE 7-16 30.6-2 p.365

 

[jjl317]

I think for the A dimension for the corner zone width on the walls may be an error (errata available online that addresses the similar Figure 30.4-1 on page 351).

Plus, for the walls, I think Figure 30.1-1 covers the same condition, and is correct.

Unless perhaps someone else knows more

 

[engreg]

So, do you read it as for all flat roofs we have to use that 0.6 number and the "a" value can only be used on pitched roofs.