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deadman anchorage

deadman anchorage

deadman anchorage

(OP)
Some deadman anchorages are being designed.  Are there any typical depth for the anchorage and what do you recommend(minimum) for depth of site investigation for the location of the deadman concrete elements.In a similar project in silty fine sand materials they advised 13' long x 2' deep x 3' wide concrete deadman buried 6' in the ground.

Am looking for a design manual that explains the typical values and how to calculate/estimate the pull-out load.  

What is the recommended depth of site investigation for the above case history. I guess about 10'. Your advise would be appreciated.  

RE: deadman anchorage

Maybe I'm misunderstanding your statement, but it seems like you are trying to size the deadman before you know the loads on the wall.  Determine the loads on the wall first, then size the deadman accordingly to mitigate those loads, plus an appropriate safety factor.

Attached is a US Army Corps of Engineers Design Manual for Sheet Pile Walls.  It gives a procedure for designing a deadman anchor (Chapter 5, page 5-10).  Make sure the deadman is behind the passive wedge of the wall!

 

RE: deadman anchorage

Also...

Unless you have a geotech report, you will be relegated to the allowable passive pressures of the IBC.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: deadman anchorage

Can also check Bowles 5th edition - he has a good section on deadmen.

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