Steel Frame Foundation 1

[DaveHolder]

I'm not sure if anyone else came across a similar exercise. Could you please share your thoughts on the following: I'm currently putting together some work examples. designing Steel frame within an existing structure, steel columns attached to existing wall .

I was wondering if it is possible to build mass foundation 1 sq meter beneath existing 0.6m wide strip footing; the new foundations must be central to steel columns, otherwise, the bearing pressure is greater than the allowable if designed as an edge foundation. Your ideas are greatly appreciated.

 

[driftLimiter]

You could put the foundation underneath the existing wall foundation, or you could dowel it into the existing wall foundation. You could build a pilaster up to the steel beam baseplate. Anything is possible, just depends what the guys in the field are prepared to do, what the budget/schedule is etc.

 

[dik]

Can you use friction piles or screw piles?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Do you feel any better?

-Dik

 

[KootK]

This is normally done as a "strap beam" with the footings not concentric with the columns (that's the point of the beam). I've never seen this done with a steel beam, however, only with concrete beams. Certainly, a steel beam strap beam could be viable if it's sufficiently stiff and appropriate measures are taken to address corrosion.

 

[JoshPlumSE]

Depending on the distance between the columns, I'm tempted to start with KootK's solution.

 

[LH1993_01]

@KootK

A strap beam as you call it is common for house extensions in the UK.

Normally a client wants the rear ground floor wall removing, replacing this wall panel with a sufficiently stiff steel "box frame" is common. The bottom chord of the frame is usually encased in a 4" of concrete.

Used generally when pad footing for a goal post frame are too large to be practical and also avoids digging beneath he party wall of the adjoining property (in the uk houses are typically terraced..)

 

[KootK]

A strap beam as you call it is common for house extensions in the UK.

Thanks for that. I'm familiar with that system but had not considered that this might be one of those. Perhaps OP can clarify.