static and dynamic loads
static and dynamic loads
(OP)
I'm sorry if this is a stupid question, but this type of thing has never come up in my work until now.
A client is putting up a new building, and on the third floor they are going to put two mixers. The mixer drawing gives me two loads, A static load of 20,000 lbs, and a dynamic load of 173,000 lbs., which sounds absurdly huge. It gives no period or frequency, no amplitude or anything I'd expect for "dynamic loading" which admittedly, I've only had introductory classes on way back in college.
My question is, how the heck do I design this building? Am I supposed to just treat the dynamic load as though it's a simple vertical load and size the beams and columns to be outrageously huge to support it? If we add an inertia base, could I design the building based just on the static load?
Thanks.
A client is putting up a new building, and on the third floor they are going to put two mixers. The mixer drawing gives me two loads, A static load of 20,000 lbs, and a dynamic load of 173,000 lbs., which sounds absurdly huge. It gives no period or frequency, no amplitude or anything I'd expect for "dynamic loading" which admittedly, I've only had introductory classes on way back in college.
My question is, how the heck do I design this building? Am I supposed to just treat the dynamic load as though it's a simple vertical load and size the beams and columns to be outrageously huge to support it? If we add an inertia base, could I design the building based just on the static load?
Thanks.






RE: static and dynamic loads
RE: static and dynamic loads
In some cases, those loads may not need to be carried through the structure. For example, if the dynamic load is intended to make the beams supporting it stiff enough to avoid vibration, you wouldn't necessarily need to include the full amount in your foundation loading. And if stiffness is the concern, you wouldn't necessarily need to combine that with wind or seismic loads.
RE: static and dynamic loads
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Greg Locock
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RE: static and dynamic loads
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.
RE: static and dynamic loads