[skachko]

Please excuse me if my question sounds trivial, I have little experience in construction. I want to make a column, 6’ tall, which will support a 1000lb weight and may be subjected to 200lb lateral load at its top. The project is located in a room with concrete slab floor. The only complication is that I must use nonmagnetic materials only, which rules out the use of steel. I was planning to build the column using CMUs strung over FRP rebars and fill the cavities with grout. Due to the presence of the lateral load I would like to anchor the column to the floor slab, but not permanently since I may have to move the project to another site.
So I thought of first casting a concrete footing with vertical rebars for the column embedded in it - see attachment (only 1st course of CMUs is shown). But is it OK to just let the anchoring bolts to pass through concrete of the footing? Should the footing have reinforcement and should the bolts be conveying the bending moment due to the lateral load to the reinforcement? I could use the column shoes from Peikko Group (see image below) if they were not made of steel.
My question: what is the correct way to anchor CMU column to the slab, using nonmagnetic commercially available supplies?

Thanks
Ivan

 

[Daniel Holzman]

What are you building, where are you located, and why are you asking such a complex question on a DIY internet chat forum?

 

[skachko]

I am building a stand (4 legs and slab with the hole in the center) to support my instrument. I am located in central PA. I am asking this question on DIY forum because I have to build this myself. I thought that anchoring a column to a slab is a routine matter for experienced DIYers. Could you suggest a better place to post my question?

 

[Aggie67]

You're over analyzing this. I understand what you need to do, but you need to forget your preconceptions of what you think you need to do to achieve this. If magnetism is the issue, use an austenitic stainless steel like 316ss. It's non-magnetic. If it's really just a 1,000 pound load at six feet, with a 200 pound lateral load, find an engineer to size up a length of pipe and a footing, sink the pipe into the footing, and fill it with concrete. Don't get crazy over-thinking this.

 

[skachko]

Thanks! I did not mention in my original post that the instrument, supported by these columns, is sensitive to vibrations. Concrete attenuates vibrations and absorbs sound better than steel. Also this much 316 stainless steel is a bit expensive. I am actually low on funding in this project.

 

[Aggie67]

Sorry I couldn't help. Good luck.

 

[47_47]

Can you use 80/20?