How to Find Seismic Weight of A Building - Full Example
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- Опубліковано 24 лип 2024
- As always please test run todays video 👉 06:17
Team Kestava jumps into the steps required to calculate the seismic weight of a building. We start from the beginning and break down how to determine types of building materials used in our building along with ways on how to find the weights of many building materials. Lastly we apply this knowledge to a real example using the AISC steel manual. MAN THAT MANUAL IS HANDY 🤏
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This is gold! Keep doing this routine, I find it much more helpful understanding what is happening rather than having stuff written down, it helps me as a young engineer understand what is happening rather than just being given the stuff. I feel like I am given true "real world" experiences with you walking through it step-by-step!
Thats great ti hear Jeffrey! Wasnt sure if I was making it more complicated than it needed to be. Glad these are helping and thanks again for sending over the materials you sent a few months ago! really do appreciate them.
@@Kestava_Engineering I agree. This was very helpful. Thank You!
If you're calculating effective seismic weight you should also include the 5 rules presented in ASCE 12.7.2 which includes some live load as well as some other non-intuitive provisions.
absolutely agree! if your situation aligns with any of the listed rules then you must consider them! typically they are for more "custom" structure types, BUT must always be checked.
This video came at the right time lol. Thank you for making it. I have a question. If I'm doing a cast in place RC parking structure, Do I do
slab weight (psf) * area of level (excluding ramp opening)
Beam weight (plf) * Total length on level
Col weight (plf) * length of column on level * # of columns
Barrier Weight (plf) * total length on level
MEP (psf) * Area
Yes! If its a single story parking structure then you only need to do 1/2 column height when determining mass for overturning and diaphragm design, but what you show above would get you the seismic mass to find base shear! I believe there is a section in the IBC or ASCE 7 that says something about having to include some snow load if the structure is open and in a region where snow levels are high. might want to check on that.
@@Kestava_Engineering Yes for Base Shear. Thanks Brother!
I'm in Sacramento, CA. No snow sadly. I wish we had it so it wouldn't be scorching hot hahaha
For a single story commercial building, I got the building weight from RAM Structural systems, but it does not include the weight of SOG (the building has spread footings). Do I need to calculate and add SOG weight to building weight for base shear?
SOG typically is not included in the seismic mass of a building.
Thank you
What portion of the live load is included in the determination of the load combinations and the loads that contribute to the base shear?
Hey Brian - live load is not included when calculating seismic mass. only dead loads.
for a one story building can you neglect the weight of the walls parallel to the direction of the force on the wall. In this case what is the force on wall to calculate sear wall design?
yes you can when your designing your diaphragm - you can also include that weight for lighter (smaller) wood construction and can be a little conservative in your design. but if you do not include the weight of the parallel walls (in the direction your analyzing) then you do need to account for there mass when your analyzing the shear walls.
When calculating seismic weight, you can ignore the weight of the walls parallel to the direction of the seismic force only if you have a flexible diaphragm. For a flexible diaphragm, walls perpendicular to the seismic force will be leaning and moving together with the diaphragm. However, walls parallel to the seismic force are relatively rigid and don't move with the diaphragm; that is why we do not include them in seismic weight calculation for a flexible diaphragm. For a flexible diaphragm, you can ignore the weight of parallel walls for both seismic base shear and diaphragm force calculations.
Would we add solar panel dead loads to this or no?
Yes! I believe most solar systems are roughly 3-5psf in addition to the roof DL. but always confirm with your systems provider!
great vid man
thanks Shaluka! means a lot man
Whats up team
question
SEOC volume 2 page 277, calculating the seismic weight of the walls lines 1 and 3, can anyone explain why they calculated that way?
they defiantly did it weirdly... for buildings like the example has you should only consider mass of walls OOP of the direction you are analyzing. and im used to taking 1/2 height of walls + parapets for wall area.