Our company is structural engineer for a project on curacao, a geo-consultancy firm made spt-tests but no longer exist.
spt's show diabase-sand that's a little silty and the worst one has following spt-log, 18, 52, 74 and at last 122.
These are respectively the 1st, to 4th foot that are tested...
I wonder why full stabilization of a beam (for example by diaphragm bracing) is: S*=1/2*A/fy
In which S* is stiffnes of bracing (diaphragm), the Shear Force needed to create an angle of 1 rad, so the Shear Force needed to deform 1 inch over one inch length of diaphragm.
1/2 is a half
fy = yield...
