ZeroLength Element: Difference between revisions

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(Adding <-doRayleigh $rFlag>)
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| style="background:yellow; color:black; width:800px" | '''element zeroLength $eleTag $iNode $jNode -mat $matTag1 $matTag2 ... -dir $dir1 $dir2 ... <-orient $x1 $x2 $x3 $yp1 $yp2 $yp3> '''
| style="background:yellow; color:black; width:800px" | '''element zeroLength $eleTag $iNode $jNode -mat $matTag1 $matTag2 ... -dir $dir1 $dir2 ... <-orient $x1 $x2 $x3 $yp1 $yp2 $yp3> <-doRayleigh $rFlag>'''
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| '''$yp1 $yp2 $yp3''' || vector components in global coordinates defining vector yp which lies in the local x-y plane for the element. (optional)
| '''$yp1 $yp2 $yp3''' || vector components in global coordinates defining vector yp which lies in the local x-y plane for the element. (optional)
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| '''$rFlag''' || optional, default = 0
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| || rFlag = 0 NO RAYLEIGH DAMPING (default)
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|  ||  rFlag = 1 include rayleigh damping
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Revision as of 02:03, 14 October 2010




This command is used to construct a zeroLength element object, which is defined by two nodes at the same location. The nodes are connected by multiple UniaxialMaterial objects to represent the force-deformation relationship for the element.

element zeroLength $eleTag $iNode $jNode -mat $matTag1 $matTag2 ... -dir $dir1 $dir2 ... <-orient $x1 $x2 $x3 $yp1 $yp2 $yp3> <-doRayleigh $rFlag>




$eleTag unique element object tag
$iNode $jNode end nodes
$matTag1 $matTag2 ... tags associated with previously-defined UniaxialMaterials
$dir1 $dir2 ... material directions:

1,2,3 - translation along local x,y,z axes, respectively

4,5,6 - rotation about local x,y,z axes, respectively

$x1 $x2 $x3 vector components in global coordinates defining local x-axis (optional)
$yp1 $yp2 $yp3 vector components in global coordinates defining vector yp which lies in the local x-y plane for the element. (optional)
$rFlag optional, default = 0
rFlag = 0 NO RAYLEIGH DAMPING (default)
rFlag = 1 include rayleigh damping

NOTE:

If the optional orientation vectors are not specified, the local element axes coincide with the global axes. Otherwise the local z-axis is defined by the cross product between the vectors x and yp vectors specified on the command line.

The valid queries to a zero-length element when creating an ElementRecorder object are 'force,' 'deformation,' 'stiff,' and 'material $matNum matArg1 matArg2 ...' Where $matNum is the tag associated with the material whose data is to be output.


EXAMPLE:

element zeroLength 1 2 4 -mat 5 6 -dir 1 2; # truss tag 1 between nodes 2 and 4 acting in directions 1 and 2 with materials 5 and 6 respectively.


Code Developed by: Gregory L. Fenves, University of Texas, Austin.