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design of cold formed column base plate connection

design of cold formed column base plate connection

design of cold formed column base plate connection

(OP)
Hello everyone,

can i please find any example of a cold formed base plate connection ?

in my case i have a back to back column using C section shape .

Many thanks.


islem

RE: design of cold formed column base plate connection

Is it reasonable to connect the Cs to a section of base track instead? If the loads are small and concentric (I would hope you aren't looking for fixity with cold formed steel) I'm imagine that is easier.

----
The name is a long story -- just call me Lo.

RE: design of cold formed column base plate connection

(OP)
Hi Lo;

the column is back to back there is no track section at bottom, but it is connected with a base plate which has a thickness of 20mm,i provided a fixed connection because i have already designed the model ,and the column status engineering passed normally.
i am just trying now to design the base plate considering the rods embedded in concrete.
thanks

Islem

islem

RE: design of cold formed column base plate connection

If you intend to weld your column to the plate make sure to check for the reduced allowable stresses, as far as I know most software does not do this.

Open Source Structural Applications: https://github.com/buddyd16/Structural-Engineering

RE: design of cold formed column base plate connection

Which directions see moments at the base plate? And what magnitudes?

It's hard for me to imagine any effective fixed connection except welded assuming that a 20mm thick base plate is needed for strength. And that might cause issues as Celt pointed out.

(Question for other contributors: does weld distortion cause issues in cold formed steel?)

Is the fixed connection really required for structural stability? I understand that's what was modeled, but if you can't achieve a practical physical connection, the model isn't worth much.

As for designing the base plate itself, following AISC design guide 1 (free online) and treating your column like a hot-rolled W-shape will be fine.

----
The name is a long story -- just call me Lo.

RE: design of cold formed column base plate connection

(OP)
it will be bolted to the plate welded to the base plate i can't attach the picture to explain more for you

thanks Lo

islem

RE: design of cold formed column base plate connection

Islem,

Here are my thoughts..

1) Trying to weld light gage to a 3/4" plate is going to be challenging. You will likely melt the light gage before you can get enough heat in the steel for a reliable connection.

2) if you are trying to resist overturning with that plate using a fixed connection, I would re-think your lateral stability strategy.

RE: design of cold formed column base plate connection

(OP)
@Lomarandil

exactly it's what was modeled , fixed bases culummns, i will try to treat it as a hot rolled and see what will brings

thanks so much

islem

RE: design of cold formed column base plate connection

I'll say it again -- what was modeled doesn't mean anything if you can't make it happen in the real world. Models are only a tool. They can be useful or they can be dangerous.

Please, check that the connection between the column and base plate works before you go any further.

----
The name is a long story -- just call me Lo.

RE: design of cold formed column base plate connection

This is not a good condition if you can avoid it.

If you can't, have you investigated pre-engineered connectors? Simpson manufacturers connections intended for cantilevered partial height walls. Other manufacturers probably do too

https://embed.widencdn.net/pdf/plus/ssttoolbox/2lj...

RE: design of cold formed column base plate connection

Fully fixed in your model is not representative of the foundation flexibility that's usually present. This combined with second order effects can have a huge impact on the distribution of the moment in a flexible frame (less base moment, more knee moment, more drift).

Now for back to back sections the company I used to work for used to use a single fin plate (with similar bending capacity to the sections) extending between the sections with sufficient overlap length for the number of bolts required, this was then welded to a cast in plate. Sometimes the baseplate was simply bolted down, sometimes the fin plate would be a hot rolled channel slightly larger than the cold formed sections.

RE: design of cold formed column base plate connection

(OP)
@Agent666

I already do the same with my case, a fin plate welded with base plate the fin plate bolted between back to back column ,just in my case I left a gap of 150mm between the two sections , i means that i have two fin plate spaced 1500 mm.

Thank you

islem

RE: design of cold formed column base plate connection

(OP)
sorry 150 mm

islem

RE: design of cold formed column base plate connection

Your links don't work?

RE: design of cold formed column base plate connection

(OP)
yes i don't know what's the issue i can't attach links

islem

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