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 value from (StructuralCurveMember)	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.