Seismic Desgin of platforms
Seismic Desgin of platforms
(OP)
Hello,
We have a building in a Site Class F Design Category E location so we have special concentrically braced frames on our main structure. We are clear on the code for that. However, where we get foggy are platforms. There are platforms that are only 3 feet to about 8 feet tall inside of our main structure which don't connect to any of the braced frames or other main structure supports. We know they will need a lateral system to resist the sesimic forces, but we can't figure out if these platforms will also need the heavy duty SCBF or moment frame detailing. We'd like to just design simple braces for these short platforms if possible. I've been looking through ASCE 7 Chap 15 and I can't really find what I'm looking for.
Any thoughts?
Any thoughts?
We have a building in a Site Class F Design Category E location so we have special concentrically braced frames on our main structure. We are clear on the code for that. However, where we get foggy are platforms. There are platforms that are only 3 feet to about 8 feet tall inside of our main structure which don't connect to any of the braced frames or other main structure supports. We know they will need a lateral system to resist the sesimic forces, but we can't figure out if these platforms will also need the heavy duty SCBF or moment frame detailing. We'd like to just design simple braces for these short platforms if possible. I've been looking through ASCE 7 Chap 15 and I can't really find what I'm looking for.
Any thoughts?
Any thoughts?






RE: Seismic Desgin of platforms
RE: Seismic Desgin of platforms
You'll have to design for some higher forces, sure. But, you might not have to follow all the seismic detailing provisions for each connection. Sometimes those requirements / restrictions can be too onerous for these little things attached to your structure.
RE: Seismic Desgin of platforms
RE: Seismic Desgin of platforms
I agree with DHK - non-building structure. A better option might be to call up the plans examiner to get the tentative OK prior to starting any real design.
RE: Seismic Desgin of platforms
Thanks again!
RE: Seismic Desgin of platforms
RE: Seismic Desgin of platforms