Design of pile strip footing 3

• May 10, 2022

• #2

hokie66

Structural

Jul 19, 2006

23,517

AU

I call them grade beams, and design them to span between piles. After all, if the ground could support the loads, you wouldn't need piles.

 

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• May 10, 2022

• Thread starter
• #3

mte12

Structural

Mar 1, 2022

146

AU

Thanks for advising.
Reason I asked is that a while ago, I got the impression that rails (for trains) may have been designed as: Supported on sleepers, in combination with the ground.

 

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• May 10, 2022

1
• #4

hokie66

Structural

Jul 19, 2006

23,517

AU

Unrelated. Sleepers (cross ties) are supported on the ground, and the rails are supported by the sleepers. The infill below the rails, between the sleepers, is called ballast, and just assists in keeping the sleepers aligned and resisting forces parallel to the rails.

 

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• May 10, 2022

1
• #5

le99

Civil/Environmental

Jan 23, 2022

380

US

For a gantry crane track, you need something rigid to span between piles, the soil below is usually ignored.

 

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• May 10, 2022

• Thread starter
• #6

mte12

Structural

Mar 1, 2022

146

AU

Great, thanks for confirming.

 

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• May 11, 2022

1
• #7

BridgeSmith

Structural

May 22, 2009

5,100

US

Theoretically, you could use the soil under the beam, but you'd need to do something like a strain compatibility analysis to determine how the load is split between the soil and the piles. After considerable effort, you'd discover that the soil contribution is so minor (due to the support provided by the piles to be so much stiffer) it wasn't worth the effort. That's why it's typically ignored.

Rod Smith, P.E., The artist formerly known as HotRod10

 

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• May 11, 2022

• Thread starter
• #8

mte12

Structural

Mar 1, 2022

146

AU

OK thanks for confirming.

 

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