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metal building - gravity column?
2

metal building - gravity column?

metal building - gravity column?

(OP)
I'm designing the foundation for metal building and hve a huge horizontal support reaction from metal building venodor.
I believe this is gravity column but I'm not so sure.

Do these columns carry horizontal load from wind typically in metal building, or should I question the vendor drawing support reactions?

RE: metal building - gravity column?

Interior or exterior?

Interior it is likely gravity only, exterior and it is likely a beam-column. If it is a frame component then you may have extremely large horizontal forces.

RE: metal building - gravity column?

(OP)
check the attachment to see which column I'm referring.

RE: metal building - gravity column?

Whether or not this column carries gravity load depends on what type of end wall frame you have, a rigid frame like the others, or if it is post and beam. But regardless, it will have a horizontal load from the wind.

RE: metal building - gravity column?

Yes, definitely horizontal load will be borne by this column.

RE: metal building - gravity column?

It's got a horizontal reaction but I'm surprised to hear that it's huge. It should be on the order of 20 ps times the trib wind area and be manageable from a foundations standpoint.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: metal building - gravity column?

(OP)
my understanding is all the horizontal will go the braced bay columns.

RE: metal building - gravity column?

Are there not wind girts on the end wall that will distribute wind applied to that faceto the column?

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: metal building - gravity column?

(OP)
thanks. I got it now. I added horizontal on the middle of the column and got horizontal support reaction.

RE: metal building - gravity column?

This is what is called a "wind column," and most of the time it does not carry gravity load (because PEMB's are often times designed for future expansion, the wind column could be removed in the future and the exterior frame would then become an interior frame).

DaveAtkins

RE: metal building - gravity column?

DaveAtkins is right. This is a wind column- probably with a slip connection on top. It should take no gravity load, and only out-of-plane wind loading

RE: metal building - gravity column?

Whether that column carries gravity loads as well as lateral loads is completely dependent on the type of frame and the type of connection to that frame. I would say most columns like that carry gravity load as well as lateral load. If the connection has vertical slip that it won't see Axial/Gravity load, if it doesn't have vertical slip than it will have Axial/Gravity load. Both kinds of columns exist. If the frame is a clears-pan rigid frame, full load width/expandable or half load width non-expandable, it will not have vertical load other than self-weight in the column reactions. If the frame is a modular rigid frame than it will most likely have Axial/gravity loads in the reactions.

One must examine the frame and the connections. Is the column top under the frame or is the column beside the frame?

Jim,

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