GGU-STABILITY: "Logarithmic spiral" menu item

If you activated the "Bearing capacity" option button in the "Editor 1/Analysis options" menu item, you can generate polygonal slip surfaces for the strip footing which, in accordance with DIN 4017, consist of a logarithmic spiral in the central area and straight lines at the ends.

You must first define two friction angles and then a number of subdivisions. The "Determine dphi" buttons allows determination of the increase in friction angle resulting from the three values.

The "No. of points log. spiral" specifies the number of points with which the logarithmic spiral is generated. After confirming with "OK" the polygonal slip surfaces are generated in accordance with your preferences. You can then analyse these polygonal slip surfaces.