Earthquakes Sway Bracing - From what you see Is seismic bracing required?

[SprinklerDesigner2]

If I am weak in any area it's earthquake sway bracing simply because I've never done it. Well, actually I have done it two jobs over 45 years the last being near Charleston just a couple years ago.

It can't be that hard but if you've never done it....

The project is located very near Savannah, Georgia and is a 35,000 sq ft aircraft hanger for unfueled aircraft designed per NFPA #409 Chapter 12. Wet sprinkler system designed to a density of .17 over 5,000.

Building itself will be a standard bent metal purlin building and is not a government DOD project.

Below is the structural notes taken from the drawing.

On the FP drawings we have this:

From what I understand is sway bracing is not required for this building? I've done a lot of work all along the east cost of Georgia and I have never seen seismic requirements before unless dealing with a federal government job.

So, if you would, bear with me and tell me what I have here. Is seismic bracing required?

 

[UFT12]

For a risk category of buildings II, Ss=0.3, S1=0.11 and a site class D, I see that you may need bracing. I say may due to two prerequisites below. The seismic design category I calculate indeed results to C as stated in the figure above which per ASCE 7-16 (see 13.1.4) requires bracing unless one of the following two exceptions apply,

a) The component Importance Factor, Ip, is equal to 1.0 and the component is positively attached to the structure

b) The component weighs 20 lb (89 N) or less or, in the case of a distributed system, 5 lb/ft (73 N/m) or less

For a), sprinkler systems are life safety systems and typically assigned with a factor of 1.5. I find it strange that your figure above shows 1 instead. I personally don't find the reference to table 1.5-2 correct because this refers to buildings and the degree of hazard they impose to human life in case of failure. Your system is not a building rather a system of non-structural components. The correct reference should be 13.1.3 where it states

You may want to check the correct interpretation on your specific case or any other special condition that may apply to allow for a factor of 1. If a factor of 1 is acceptable/approved then bracing should not be required.

For b) you would want to check whether your systems weights 5 lb/ft or less although I doubt this is the case.