Crane foundation - CIRIA C761

[TWfea]

Hi All, I was wondering if anyone could help me to understand the eccentricity equation in Example 1 contained in the CIRIA report C761.

The equation is Eccentricity, e2 = Md x sin(45) / Fd,

Where
Md is the moment,
Fd is the vertical force


I understand, that the eccentricity is = Md/Fd, however it is the inclusion of sin(45) that I don't quite get.

I know the question is quite specific, but If anyone has any insight on this it would be greatly appreciated!

 

[Lomarandil]

Md is moment on the diagonal, so perhaps the eccentricity is being defined relative to the orthogonal axis?