2. MODELING

CHAPTER 2 "MODELLING" 19 • In the " Earths hs " field, type the value you want. The height of the overlying earth is calculated from the base of the foundation to the ground surface. • In " Pedicle-Cone ", the difference is that you have to specify the thickness u of pedicle plate (equal to H/3) ATTENTION: A prerequisite for the placement of the pedestals is the existence of supports. The checkbox next to " Shared Skirt " is activated to place a shared skirt on two or more columns. In the window the cross-section of the pediment is formed based on the geometry you have selected and the dimensions you have entered. Here you also see the local yy and zz axes of the cross-section. • For elastic supports, check the " Soil Involvement " indicator, and type the value of the Ks indicator. The value given by the designer in the software (in MPa/cm which are the corresponding units of MN/m3 after conversion) is multiplied by the foundation surface (length x width) in order to obtain the vertical spring constant (in kN/m) which is placed at the corresponding node and which constant expresses the soil's intractability. So the spring constant is Ky= Lx*Lz*ks. Similarly, two torsion springs about the x-axis and about the z-axis, whose constant is equal to K=ks* the corresponding moment of inertia in each direction of the foundation element, are placed in the node. For example, for a skirt with ks=1 MPa/cm = 100000 KPa /m and dimensions 1*1 m, the vertical constant of the spring used will be Ky=1 m*1 m*1 MPa/cm = 100000 kN/m