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Allowable Axial load increase on a column ?

Allowable Axial load increase on a column ?

Allowable Axial load increase on a column ?

(OP)
The original column was designed to support 344,500 #, however the new load on this column will be almost 393,000 #.
Would the column be okay for the new load (larger)?
Whats allowable increase in the load?

The column as you guessed is a reinforced concrete column which has capital on top.

I appreciate for you directions and advice

RE: Allowable Axial load increase on a column ?

Where did you get the figure of what the column was designed for?
You need to assess the capacity of the column and compare it to the new load to see if it is sufficient without upgrading.
There's no way to know how much 'fat' the column was designed with until you do the calculation.

RE: Allowable Axial load increase on a column ?

Agree with atrizzy. The IBC does allow a 5% increase I think, but doing the calculation is always a good idea.
You never know when a former engineer perhaps messed up and your additional load could be "the straw that broke the camel's back".

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RE: Allowable Axial load increase on a column ?

Quote (JAE)

Agree with atrizzy. The IBC does allow a 5% increase I think,

Reminds me of our council tree policy. It is strictly forbidden to cut down trees, but you can prune up to 10% at a time without asking, and trees below a certain height can be cut down freely smile

RE: Allowable Axial load increase on a column ?

Tomfh, what could go wrong? ;)

RE: Allowable Axial load increase on a column ?

10% today, 10% tomorrow, 10% the day after. Boom under the height restriction, 70% the fourth day.

RE: Allowable Axial load increase on a column ?

I'm not sure if this is in the IBC or just my locally adopted code but here it says "...cumulative since the original construction."

RE: Allowable Axial load increase on a column ?

(OP)
DETstru (Structural)
Can u please attach the page of the code
What year IBC what chapter?

Thanks

RE: Allowable Axial load increase on a column ?

Yea, probably best to run the calculation. I typically only use the 5% increase allowance from IBC if the load is a temporary load that will be removed somewhere down the line

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