RBE2 (Rigid Body Element, Form 2)

Description

The RBE2 entry defines a rigid body whose degrees of freedom are specified at a single grid point and whose dependent degrees of freedom are specified at an arbitrary number of grid points.

This option allows you to create a rigid body by giving a list of grid points.

Note that all degrees of freedom are made rigid in Autodesk Explicit.

Format

1	2	3	4	5	6	7	8	9	10
RBE2	EID	GN		GM1 optional	GM2 optional	GM3 optional	GM4 optional	GM5 optional	optional
optional	GM6 optional	GM7 optional	GM8 optional	GM9 optional	-etc.-	optional	optional	optional	unused

Example

RBE2	12	2		15	18	22	25	27
	34

Field	Definition	Type	Default
EID	Element identification number.	Integer > 0	Required
GN	Identification number of grid point to which all six independent degrees of freedom for the element are assigned.	Integer > 0	Required
GMi	Grid point identification numbers at which dependent degrees of freedom are assigned.	Integer > 0

Remarks

1. Rigid elements, unlike MPCs, are not selected through the Case Control Section.
2. The grid point designated as GN is referred to as the reference node. It may or may not be at the center of mass of the rigid body.
3. The grid points GMi make up what is called the set of member nodes for the rigid body (the member list).