ZeroLength Element: Difference between revisions

From OpenSeesWiki
Jump to navigation Jump to search
(New page: his 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 ...)
 
No edit summary
 
(14 intermediate revisions by 3 users not shown)
Line 1: Line 1:
his 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.
{{CommandManualMenu}}
 
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.


{|  
{|  
| 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:lime; color:black; width:800px" | '''element zeroLength $eleTag $iNode $jNode -mat $matTag1 $matTag2 ... -dir $dir1 $dir2 ...<-doRayleigh $rFlag> <-orient $x1 $x2 $x3 $yp1 $yp2 $yp3>'''
|}
|}


Line 17: Line 19:
|-
|-
| '''$dir1 $dir2 ...''' || material directions:
| '''$dir1 $dir2 ...''' || material directions:
 
|- 
1,2,3 - translation along local x,y,z axes, respectively
| || 1,2,3 - translation along local x,y,z axes, respectively;
 
|- 
4,5,6 - rotation about local x,y,z axes, respectively
| || 4,5,6 - rotation about local x,y,z axes, respectively
|-
|-
| '''$x1 $x2 $x3''' || vector components in global coordinates defining local x-axis (optional)
| '''$x1 $x2 $x3''' || vector components in global coordinates defining local x-axis (optional)
|-
|-
| '''$yp1 $yp2 $yp3''' || vector components in global coordinates defining vector yp which lies in the local x-y plane for the element. (optional)
| '''$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
|}
|}


Line 31: Line 39:
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.
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.
The valid queries to a zero-length element when creating an ElementRecorder object are 'force,' 'deformation,' and 'material $i matArg1 matArg2 ...' Where $i is an integer indicating which of the materials whose data is to be output (a 1 corresponds to $matTag1, a 2 to $matTag2, and so on).  
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.


element zeroLength 1 1 2 -mat 1 -dir 1 -orient 1 1 0 -1 1 0; # truss tag 1 between nodes 1 and 2 acting in local direction 1 defined with material 1. Local direction 1 attains 45 degrees with global X axis


EXAMPLE:
element zeroLength 1 1 2 -mat 1 -dir 1 -doRayleigh 1 -orient 1 1 0 -1 1 0; # the same as the example above but also includes the stiffness of this element in calculation of the damping matrix if Rayleigh command is invoked later.  
 
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: <span style="color:blue"> Gregory L. Fenves, University of Texas, Austin. </span>
Code Developed by: <span style="color:blue"> Gregory L. Fenves, University of Texas, Austin. </span>

Latest revision as of 16:01, 3 October 2014



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 ...<-doRayleigh $rFlag> <-orient $x1 $x2 $x3 $yp1 $yp2 $yp3>



$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,' and 'material $i matArg1 matArg2 ...' Where $i is an integer indicating which of the materials whose data is to be output (a 1 corresponds to $matTag1, a 2 to $matTag2, and so on). 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.

element zeroLength 1 1 2 -mat 1 -dir 1 -orient 1 1 0 -1 1 0; # truss tag 1 between nodes 1 and 2 acting in local direction 1 defined with material 1. Local direction 1 attains 45 degrees with global X axis

element zeroLength 1 1 2 -mat 1 -dir 1 -doRayleigh 1 -orient 1 1 0 -1 1 0; # the same as the example above but also includes the stiffness of this element in calculation of the damping matrix if Rayleigh command is invoked later.

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

Retrieved from "https://opensees.ist.berkeley.edu/wiki/index.php?title=ZeroLength_Element&oldid=11466"