*STPRO

Data format:

A single line with three parameters followed by the number of lines necessary to define the non-zero components of the connection stiffness matrix (those lines have three parameters)

IPRO IREP IMOM
ROW(i) COL(j) STIFF(i,j)
...

or

IPRO IREP IMOM
ROW(i) COL(j) 0 IDPRO(i,j)
...

Status :

Optional

Purpose :

To define the property of a stiffness matrix at connection

Restriction :

\(i\) and \(j\) must be comprised between 1 and 6. The matrix is considered symmetric therefore if STIFF(i,j) is defined STIFF(j,i) should not be defined and is automatically equal to STIFF(i,j)

Details :

Parameter	Description
IPRO	Property number
IREF	IREF = 0: the reference frame to define the matrix is an average frame between the two nodes defined in STCONNECT IREF = 1: the reference frame to define the matrix is the fairlead node (first node in STCONNECT) IREF = 2: the reference frame to define the matrix is the second node in *STCONNECT
MOM	MOM = 0: Full loads and stiffness is used (including geometrical stiffness) MOM = 1: Loads and stiffness from stiffness matrix only are used
ROW(i)	Row identification of the matrix
COL(j)	Column identification of the matrix
STIFF(i,j)	6x6 Stiffness matrix in (ROW,COL), only read if IDPRO(i,j)=0. Units of the matrix terms are as follows: STIFF(i,j) with i=1,3; j=1,3 : N/m STIFF(i,j) with i=1,3; j=4,6 : N/rad STIFF(i,j)with i=4,6; j=1,3 : N.m/m STIFF(i,j) with i=4,6; j=4,6 : N.m/rad
IDPRO(i,j)	Property ID used to define a mulitlinear stiffness through *SPRINGPRO, note that the property should cover negative and positive displacement