SAF Documentation
v2.0.0
Search…
⌃K

RelConnectsRigidCross

Rigid Cross

RigidCross is defining structural behavior of node (StructuralPointConnection), where two 1D elements (StructuralCurveMember) are being crossed. 1D members could be independent or dependency could be defined in following excel sheet. Rigid cross is often used for bracing of the structure.

Specification in the excel

Name of the column header
Type of data
Value example or enum definition
Required value
Description
Name
String
RC1
yes
Human readable unique name of the object
1D Members
String
B1; B3
yes
The name from (StrucutralCurveMember)
Two 1D members should be defined
Type
Enum
Fixed
Hinged
Custom
no
Constraint of the Rigid Cross
The way the Rigid Cross acts in individual directions. Has informative character.
When all constraints are set to Rigid = Fixed
When all constraints are set to Free = Hinge
Custom allows user defined behavior of Cross link and creating the Coupler
u1
Enum
Free
Rigid
Flexible
Compression only
Tension only
Flexible compression only
Flexible tension only
Non linear
yes
Displacement of first connected member
Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined
(Flexible) compression/tension only - acts rigid or flexible, only for defined strain (compression or tension)
u2
Enum
Free
Rigid
Flexible
Compression only
Tension only
Flexible compression only
Flexible tension only
Non linear
yes
Displacement of second connected member
Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined
(Flexible) compression/tension only - acts rigid or flexible, only for defined strain (compression or tension)
u
Enum
Free
Rigid
Flexible
Compression only
Tension only
Flexible compression only
Flexible tension only
Non linear
yes
Displacement of RigidCross
Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined
(Flexible) compression/tension only - acts rigid or flexible, only for defined strain (compression or tension)
fi1
Enum
Free
Rigid
Flexible
Non linear
yes
Rotation for the first connected member
Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined
fi2
Enum
Free
Rigid
Flexible
Non linear
yes
Rotation for the second connected member
Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined
fi
Enum
Free
Rigid
Flexible
Non linear
yes
Rotation for the RigidCross
Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined
Stiffness u1 [MN/m]
Double
3.0
yes, if u1 = Flexible, Flexible compression/tension only or Non linear
The flexibility in direction of first member
Use this property only if the u1 is set Flexible, Flexible compression/tension only or Non linear
Resitance u1 [MN]
Double
0.20
yes, if u1 = Non linear
The resistance in direction of first member
Use this property only if the u1 is set Non linear
Stiffness u2 [MN/m]
Double
3.0
yes, if u2 = Flexible, Flexible compression/tension only or Non linear
The flexibility in direction of second member
Use this property only if the u2 is set Flexible, Flexible compression/tension only or Non linear
Resitance u2 [MN]
Double
0.20
yes, if u2 = Non linear
The resistance in direction of second member
Use this property only if the u2 is set Non linear
Stiffness u [MN/m]
Double
5.0
yes, if u = Flexible, Flexible compression/tension only or Non linear
The flexibility of the RigidCross
Use this property only if the u is set Flexible, Flexible compression/tension only or Non linear
Resitance u [MN]
Double
0.35
yes, if u = Non linear
The resistance of the RigidCross
Use this property only if the u is set Non linear
Stiffness fi1 [MNm/rad]
Double
1.0
yes, if fi1 = Flexible, Flexible compression/tension only or Non linear
Torsional stiffness around the 1st member
Use this property only if the fi1 is set Flexible or Non linear
Resistance fi1 [MNm]
Double
0.05
yes, if fi1 = Non linear
Torsional resistance around the 1st member
Use this property only if the fi1 is set Non linear
Stiffness fi2 [MNm/rad]
Double
1.0
yes, if fi2 = Flexible, or Non linear
Torsional stiffness around the 2st member
Use this property only if the fi2 is set Flexible or Non linear
Resistance fi2 [MNm]
Double
0.05
yes, if fi2 = Non linear
Torsional resistance around the 2st member
Use this property only if the fi2 is set Non linear
Stiffness fi [MNm/rad]
Double
4.0
yes, if fi = Flexible or Non linear
Torsional stiffness of the RigidCross
Use this property only if the fi is set Flexible or Non linear
Resistance fi [MNm]
Double
0.25
yes, if fi = Non linear
Torsional resistance of the RigidCross
Use this property only if the fi is set Non linear
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

Resistance is defined by the value of maximal strain. Until is the value of maximal strain reached, Rigid cross acts fully rigid. After the value exceeded, RigidCross acts flexibly due to defined Value of Stiffness. This is how non linear behavior is achieved.
The axis of the connection is defined by the members of the RigidCross:
  • The first axis is assigned to the first member (i.e. the first member selected by the user during the definition of a new RigidCross - column "1D Members").
  • The second axis is assigned to the second member (i.e. the second member selected by the user during the definition of a new RigidCross - column "1D Members").
  • The third axis is perpendicular at the plane defined by member 1 and member 2.
Non linear behavior of material is handled with "Resistance". The example is shown below.