CELAS1

Bulk Data Entry

CELAS1 – Scalar Spring Connection

Description

Defines a scalar spring element of the structural model.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CELAS1	EID	PID	G1	C1	G2	C2

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CELAS1	2	6			8	1

Field	Contents
EID	Unique element identification number. No default (Integer > 0)
PID	PELAS property entry identification number. Default = EID (Integer > 0)
G1,G2	Geometric grid point or scalar point identification number. Default = 0 (Integer > 0)
C1,C2	Component number in the displacement coordinate system specified by the CD entry of the GRID data. Default = 0 (0 < Integer < 6)

Comments

1.	Zero or blank may be used to indicate a grounded terminal G1 or G2 with a corresponding blank or zero C1 or C2. A grounded terminal is a point whose displacement is constrained to zero.

2.	Scalar points may be used for G1 and/or G2 (with a corresponding C1 and/or C2 of zero or blank). If only scalar points and/or grounded terminals are involved, it is more efficient to use the CELAS3 entry.

3.	The two connection points (G1, C1) and (G2, C2) must be distinct.

4.	A scalar point specified on this entry need not be defined on an SPOINT entry.

When the SPSYNTAX setting on the SYSSETTING I/O option is set to CHECK (default) or STRICT, it is required for grid/component pairs (G#/C#) that the component be 0 or blank when the grid reference is a scalar point (SPOINT), and that the component be > 1 when the grid reference is a structural grid point (GRID). When SPSYNTAX is set to MIXED, it is allowed for grid/component pairs (G#/C#) that the grid reference be either a scalar point (SPOINT) or a structural grid point (GRID) when the component is 0, 1 or blank; interpreting all of these as 0 for scalar points and as 1 for structural grids. When the component is greater than 1, the grid reference must always be a structural grid (GRID).

A CBUSH element, referencing a PBUSH property with a single stiffness term, is equivalent to a CELAS1 or CELAS2 element, only when the elements have zero length. A non-zero length CBUSH assumes rigid body connections from the connection points, GA and GB, to the spring-damper location, as defined either by S or the OCID and Si fields.

7.	This card is represented as a spring or mass element in HyperMesh.