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 $yp3''' || vector components in global coordinates defining vector yp which lies in the local x-y plane for the element. (optional) | ||
|- | |||
| '''$rFlag''' || optional, default = 0 | |||
|- | |||
| || rFlag = 0 NO RAYLEIGH DAMPING (default) | |||
|- | |||
| || rFlag = 1 include rayleigh damping | |||
|} | |} | ||
Revision as of 02:03, 14 October 2010
- Command_Manual
- Tcl Commands
- Modeling_Commands
- model
- uniaxialMaterial
- ndMaterial
- frictionModel
- section
- geometricTransf
- element
- node
- sp commands
- mp commands
- timeSeries
- pattern
- mass
- block commands
- region
- rayleigh
- Analysis Commands
- Output Commands
- Misc Commands
- DataBase Commands
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.