Column baseplate design 1

[ehcet]

I need some help for the following.
Design of circular(tubing )column baseplate.
Not only axial load but also Moment.
How to find plate size, (Diameter,thickness) bolt sizes
and stiffener calculation.
Thanks.

 

[ishvaaag]

AISC in its

Steel Design Guide Series Nº 1
Column Base Plates

recommends to use a critical section at 0.80 times the outside diameter, then follow the procedures for tubes.

That is you check the plastic capacity there is enough, both for bolt and footing response action.

My best advice is that you get such publication and follow whta said.

Anyway, the bolts you can size for tension (coming from moment if any) and shear (if on them we rely to pass the shear to the footing). On the compressive side you assume some plastified response that not exceeds what bearable for the case.

You can get rid of the shear by using a welded shear lug welded under plate to shear transfer purpose.

And this is basically what is required to do.

 

[Bannu]

ehcet,

Agreeing with ishvaaag, it is better to design the base stiffeners to avoid local buckling of circular columns.

The critical section for local buckling may be assumed at a height about half the diameter of the column.

 

[meca]

This could be treated similarly to a base plate for a cylindrical vessel, stack, or monopole. Here are some references:

"Pressure Vessel Handbook" by Eugene Megyesy
"Pressure Vessel Design Manual" by Dennis Moss
"Process Equipment Design" by Brownell and Young

I offer a spreadsheet to perform this type of design on my website (

http://www.mecaconsulting.com).