Metal building foundation design
Metal building foundation design
(OP)
I just posted this in the foundation section of the Geotech forum, then I realized I was in Geotech and these are more structural questions.
I have a few metal building foundation projects coming up. On the last foundation I did for this company, there were 15 to 20 different base plate/edge distance/reaction combinations. For most of these, there were 8 or so wind reactions, 2-4 seismic reactions plus the dead, live and collateral reactions. This is a lot of load combinations to check by hand (I actually set up an excel spreadsheet) and it takes a long time. Is this how most of you go about finding the critical reactions? Is there a way to simplify it? I know you can eliminate some of the LC by inspection, but it is still very time consuming.
Also, I am in a high seismic area. When designing for uplift or shear, if you add enough rebar so the concrete breakout is not of concern, you can assume you have ductile failure of the rebar, correct? I want to be able to avoid having to use the overstrength factor because the seismic loads are high enough already, I don't want to have to design for double or triple the reaction. Thanks
I have a few metal building foundation projects coming up. On the last foundation I did for this company, there were 15 to 20 different base plate/edge distance/reaction combinations. For most of these, there were 8 or so wind reactions, 2-4 seismic reactions plus the dead, live and collateral reactions. This is a lot of load combinations to check by hand (I actually set up an excel spreadsheet) and it takes a long time. Is this how most of you go about finding the critical reactions? Is there a way to simplify it? I know you can eliminate some of the LC by inspection, but it is still very time consuming.
Also, I am in a high seismic area. When designing for uplift or shear, if you add enough rebar so the concrete breakout is not of concern, you can assume you have ductile failure of the rebar, correct? I want to be able to avoid having to use the overstrength factor because the seismic loads are high enough already, I don't want to have to design for double or triple the reaction. Thanks






RE: Metal building foundation design
We use MBS software. It will output all reactions from various load combinations, you just need pick the most critical one for downward, uplift, and horizontals respectively to design foundation, no need to do load combinations yourself.
RE: Metal building foundation design
Also, why does the metal building have so many different baseplate + anchor edge distance combinations? Most I've seen is like 3. Corner, endwall/sidewall, overhead door track columns.
RE: Metal building foundation design
This is a task that is normally never given enough budget.
RE: Metal building foundation design
RE: Metal building foundation design
I have a spreadsheet that runs through about 40 or so load combinations. I take the most critical loads and run them through that sheet.
RE: Metal building foundation design
RE: Metal building foundation design
RE: Metal building foundation design