StructuralSurfaceConnection

Support on 2D member

Instances of the objects StructuralSurfaceConnection are used to describe structural supports provided by planar elements. In most cases, it represents the interaction between the structure and the subsoil.

The properties of such model are expressed by what is called interaction parameters marked C. These parameters are assigned directly to structural elements that are in contact with the subsoil and they influence the stiffness matrix in analysis calculation.

To simplify the matter, we may imagine that C is the characteristic of elastic, more precisely pseudo-elastic, links, or surface spring constants that change according to the actual state of the analysed system. We may also use the professional slang that calls it “support on C parameters”, which is the generalisation of standard Winkler idea of the supporting in the form of thick liquid g = C1 (MNm-3) or in the form of an infinitely dense system of vertical springs. The parameters of the interaction between the foundation and the subsoil depend on the distribution and loading level, or the contact stress between the structure surface and the surrounding subsoil, on the geometry of the footing surface and on mechanical properties of the soil.

Specification in the excel

Column header	Data type	Example / enum definition	Required	Description
Name	String	Sn6	yes	Human readable unique name of the support
2D Member	String	S13	yes	The name of the StructuralSurfaceMember to which is the surface support is related
2D Member Region	String	R1	no	The name of the StructuralSurfaceMemberRegion to which is the surface support related if it is available on 2D member
Subsoil	String	Gravel	yes	Type of the subsoil
Description	String	Loam/Very sandy	no	Characteristics of the subsoil
C1x [MN/m3]	Double	80.5	yes	Resistance of environment against xP (mm) [C1x in MN/m3] (deformation in local x direction) See notes for coordinates reference.
C1y [MN/m3]	Double	35.5	yes	Resistance of environment against yP (mm) [C1y in MN/m3] (deformation in local y direction) See notes for coordinates reference.
C1z Spring	String	Linear	no	Resistance of environment against zP (deformation in local z direction). Non-linear is not supported. See notes for coordinates reference.
C1z [MN/m3]	Double	50	yes	Resistance of environment against zP (mm) [C1z in MN/m3] (deformation in local z direction) See notes for coordinates reference.
C2x [MN/m]	Double	15.5	yes	Resistance of environment against zP/xP (mm/m) [C2x in MN/m] See notes for coordinates reference.
C2y [MN/m]	Double	10.2	yes	Resistance of environment against zP/yP (mm/m) [C2y in MN/m] See notes for coordinates reference.
Parent ID	String	67b35d84-3d04-47aa-aa4a-dc1263982320	no	Is filled for objects created be dividing curved geometry to series of straight line objects. Parent ID will ensure that curved edge is imported as straight parts to nonsupporting application, and back to original supporting application as curved geometry. To ensure successful round trip of segmented objects and their related objects, Parent ID needs to be present in both directions.
Id	String	39f238a5-01d0-45cf-a2eb-958170fd4f39	no	Unique attribute designation

Notes

Local coordination system is given by parent 2D object - StructuralSurfaceMember