CBUSH

CBUSH – Elements

Defines a generalized spring structural element.

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CBUSH	EID	PID	GA	GB	G0/X1	X2	X3	CID

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CBUSH	2	6	8	1

Field	Contents
EID	Element identification number. (Integer > 0)
PID	Property identification number of a PBUSH entry. (Integer > 0; If blank defaults to EID)
GA,GB	Grid point identification number of connection points. See comment 6.
Xi	Components of orientation vector $image\vequation.gif$ , from GA, in the displacement coordinate system at GA. (Real)
G0	Alternate method to supply vector $image\vequation.gif$ using grid point GO. Direction of $image\vequation.gif$ is from GA to GO. $image\vequation.gif$ is then transferred to End A. (Integer > 0) See comment 3.
CID	Element coordinate system identification. A 0 means the basic coordinate system. If CID is blank, then the element coordinate system is determined from GO or Xi. (Integer ³ 0 or blank) See figure 1 and comment 3.

Element identification numbers must be unique with respect to all other element identification numbers.
Figure 1 shows the bush element geometry.
CID ³ 0 overrides GO and Xi. Then the element x-axis is along T1, the element y-axis is along T2, and the element z-axis is along T3 of the CID coordinate system. If the CID refers to a cylindrical coordinate system or a spherical coordinate system, the grid GA is used to locate the system. If for cylindrical or spherical coordinate, GA falls on the z-axis used to define them, it is recommended that another CID be selected to define the element x-axis.
For noncoincident grids (GA ¹ GB), when GO or (X1, X2, X3) is given and no CID is specified, the line AB is the element x-axis and the orientation vector $image\vequation.gif$ lies in the x-y plane (similar to the CBEAM element).
For noncoincident grids (GA ¹ GB), if neither GO or (X1, X2, X3) is specified and no CID is specified, the line AB is the element x-axis. This option is valid only when K1 or K4 or both on the PBUSH entry are specified (but K2, K3, K5, and K6 are not specified). If K2, K3, K5, or K6 are specified, a fatal message will be issued.
If GA and GB are coincident, or if GB is blank, then CID must be specified.

$image\cbushelem.gif$

Figure 1: CBUSH Element.

Go To