Support on surface

The interaction between the structure and subsoil is calculated if the structure is put on a support of "Soilin" type.

The procedure to define a new Soilin support

1. Create the structure to be supported.
2. Open service Structure.
3. Start function Support > Surface (el. foundation).
4. Adjust the parameters (see chapter Surface support on slab).
5. Confirm with [OK].
6. Select the slab (groundslab) or slabs that should be supported with this type of support

If the ground-slab is not horizontal, one should be aware of the following:

The correct calculation of C parameters assumes that the structure that is in contact with subsoil is more or less horizontal. Technically speaking, the inclination of the footing surface up to 5 to 8 degrees can be allowed. Program is capable of dealing with footing surface in several z-levels, but the results are acceptable only if the z-levels are within certain limits – see the following literature (in Czech):

• Kolář V.: Matematické modelování geomechanických úloh. Skriptum pro postgraduální studium FAST VUT Brno, 1990, 60 str.
• Buček J., Kolář V., Obruča J: Manuál k programu SOILIN, FEM consulting Brno, 1993
• Buček J., Kolář V.: Iterační výpočet NE-XX - SOILIN, FEM consulting Brno, 1995
• Kolář V.: Statické výpočty základových konstrukcí. Knižnice Aktualit České matice technické Praha, ed. plán 1994.
• Kolář V.: Teoretický manuál FEM-Z k programům DEFOR a NE-XX, seminář FEM consulting s.r.o., 5. - 6.10.1993 v Brně.

The surface support properties

Name: Specifies the name of the support.

Type: Defines the type of support – see below.

Subsoil: If necessary for the selected type, this item specifies the subsoil parameters.

Type

Individual:

A particular subsoil type is assigned to the slab.
The subsoil is defined by means of C parameters. These user-defined C parameters are used for the calculation (of e.g contact stress in the footing surface). It is possible to set for parameter C1z a nonlinear function.

Soil-in:

For such a support, the interaction of the structure with the foundation subsoil is carried out by means of SOIL-IN module.
Parameters C1z, C2x, C2y are calculated by SOIL-IN module.

Both:

Both of the above mentioned types are combined on the same slab.
The user defines which C parameters will be user-defined and which ones will be calculated by SOIL-IN module.
Parameters can be defined in subsoil properties. Those C parameters that are input in the subsoil-property dialogue as zero, will be calculated by the SOIL-IN module. Nonzero parameters will be taken as they are input.

The additional springs are automatically added on the edges if soilin calculation doesn’t recognize additional plates around the support. See chapter Advanced tips.