Mike, I appreciate your practical opinion. But the more I look at it, the more I'm comfortable with CAT II. Reasons being:
1. It says PRIMARY occupancy is public assembly. I think a grocery sore is primarily mercantile.
2. People need 5 sf of space in an area of assembly for standing room...
I guess my hang up is that CAT III states, "whose primary occupancy is public assembly...". It isn't classified as Assembly (group A), but as a Mercantile (group M).
thread507-184821
I am looking at an existing building that is having some changes made along with a small, new addition (seismically isolated). It is a Mercantile area and has an occupancy of 1350 or so. I'm trying to decided if I can justify Building Cat II or if I need to go III. The...
Sail,
How do you resist seismic then? All through passive pressure? I'm considering the uplift due to seismic, but obviously the weight of the footing counteracts this. So that net downward load is good for resisting sliding by friction, no?
No chance of liquefaction. Mike, how would you detail it? If I get rid of the isolation joint, then I feel like I'm setting myself up for problems. And during an EQ, I'm not sure I care that the footing moves enough to compress the material and engage the slab.
I have a building with structural steel columns on spread footings. The lower level is a slab on grade, reinforced with WWF. The columns have isolation joints around them. In the event of an earthquake, can I count on the slab to do anything to resist sliding? I realize that the columns...
