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This command is used to construct a zeroLengthND element object, which is defined by two nodes at the same location. The nodes are connected by a single NDMaterial object to represent the force-deformation relationship for the element.
element zeroLengthND $eleTag $iNode $jNode $matTag <$uniTag> <-orient $x1 $x2 $x3 $yp1 $yp2 $yp3>
$eleTag |
unique element object tag |
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$iNode |
$jNode |
end nodes |
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$matTag |
tag associated with previously-defined NDMaterial object |
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$uniTag |
tag associated with previously-defined UniaxialMaterial object which may be used to represent uncoupled behavior orthogonal to the plane of the NDmaterial response. If the NDMaterial object is of order two, the response lies in the element local x-y plane and the UniaxialMaterial object may be used to represent the uncoupled behavior orthogonal to this plane, i.e. along the local z-axis. If the NDMaterial object is of order three, the response is along each of the element local exes. |
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the orientation vectors can be specified for the element (optional): |
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$x1 $x2 $x3 |
vector components in global coordinates defining local x-axis (vector x) |
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$yp1 $yp2 $yp3 |
vector components in global coordinates defining vector yp which lies in the local x-y plane for the element: |
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the local z-axis is defined by the cross product between the vectors x and yp |
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If the optional orientation vectors are not specified, the local element axes coincide with the global axes.
NOTE: The zeroLengthND element only represents translational response between its nodes
The valid queries to a zero-length element when creating an ElementRecorder object are 'force,' 'deformation,' 'stiffness,' and 'material matArg1 matArg2 ...'
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