Windmills stress distribution for the foundation

[coopernik]

When I consider remedy measures for foundation of a windmill, it´s correct to taking into account triangle distribution of stress on the level of the toe?

It´s composition of:
1. stress from transformation of the moment
2. stress from weight of foundation
3. stress from weight of a tube and rotor is neglected.

After some exercise, I reach the solution for a worst-case. It´s means max. under the corner of foundation and zero under the center( triangle distribution).

Any suggestion?

 

[csd72]

coopernik,

There have been a couple of posts on biaxial foundation stress. Do a search at the top.

csd

 

[DRC1]

Tat is not good for a foundation in soil. Zero point should not leave the heel. Otherwise a.) method calulating stress changes, b) stress increase rapidly.
Suggest the foundation be reviewed, size may need to be increased.

Also if the tube and rotor add weight to the structure, it should be included in the foundation load.

 

[civilperson]

If the portion of the foundation in tension is to be utilized, helical anchors or piles with uplift capacity must be utilized. Try a drilled pier or caisson foundation with embedment into good soil: say a 48" diameter drilled pier with 35' embedment. Depending on the horizontal subgrade modulus, this combination works for large moments and moderate axial loads.