Home > List of Keywords > *BARGEN
*BARGEN
Data format:
An arbitrary number of lines with 10 values each
NBBAR NEL NELI JO JOI JE JEI IPRO IMAT
...
Status:
Optional
Purpose:
To define series of bar elements (3 degrees of freedom per nodes)
Restriction:
The total number of elements (all types) may not exceed MAXEL. The nodes JO, JE and all the other nodes that will be used as extremities of the generated elements must have been previously defined.
Details :
| Parameter | Description |
|---|---|
| NBBAR | Number of bar elements to be generated |
| NEL | Identification number of the first element |
| NELI | Element number increment |
| JO | Origin node of the first element |
| JOI | Increment on the origin node number |
| JE | End node of the first element |
| JEI | Increment on the end node number |
| IPRO | Index in the table of elementary mechanical and geometrical properties (previously defined by keyword *BARPRO) |
| IMAT | Material index (previously defined by keyword *MAT) |
| XLTOT | The length of each generated element is XLO = XLTOT/NBBAR. If XLO=0, the element length is taken from the corresponding properties keyword (referred by IPRO). If XL0 is still null the element length is the initial distance between the nodes composing it. |
Notes :
- The program will generate NBBAR elements with properties IPRO and material IMAT :
El. NEL connecting nodes JO and JE El. NEL+NELI connecting nodes JO+JOI and JE+JEI ... EL. NEL+(NBBAR-1)NELI connecting nodes JO+(NBBAR-1)JOI and JE+(NBBAR-1)*JEI
-
the bar elements are given in an initially unstressed configuration.
-
for this reason the bar elements present no transverse stiffness (geometrical stiffness) at the first iteration of the static calculation. For some configuration this may lead to a singular matrix. Use a different value for the DASAT(1) term (see *CONVS) to go through the first iterations.
Examples :
a)
*BARGEN
2 47 1 16 1 40 1 1 1
Two bar elements will be generated from element 47, with an increment of one. Element 47 will start at node 16 and end at node 40. Element 48 will start at node 17 and end at node 41.
These bar elements will have the mechanical properties previously defined by the index 1 of BARPRO and a material index of 1 previously defined by MAT. The lengths of the bars are equal to the initial distances between nodes 16 and 40, and between 17 and 41, respectively. It is therefore important to well define the nodes initially in order to be sure that the distances are correct.
b)
*BARGEN
2 16 23 16 24 17 24 1 1
Two bar elements will be generated from element 16. with an increment of 23. Element 16 will start at node 16 and end at node 17, Element 39 (16+23) will start at node 40 (16+24) and end at node 41 (17+24).
These bar elements will have the mechanical properties previously defined by the index 1 of BARPRO and a material index of 1 previously defined by MAT. The lengths of the bars are equal to the initial distances between nodes 16 and 17, and between 40 and 41, respectively. It is therefore important to well define the nodes initially in order to be sure that the distances are correct.
