220.127.116.11. zeroLengthND Element¶
element('zeroLengthND', eleTag, *eleNodes, matTag, <uniTag>, <'-orient', *vecx, vecyp>)
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.
unique element object tag
a list of two element nodes
tag associated with previously-defined ndMaterial object
tag associated with previously-defined UniaxialMaterial object which may be used to represent uncoupled behavior orthogonal to the plane of the NDmaterial response. SEE NOTES 2 and 3.
a list of vector components in global coordinates defining local x-axis (optional)
a list of vector components in global coordinates defining vector yp which lies in the local x-y plane for the element. (optional)
- The zeroLengthND element only represents translational response between its nodes
- 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.
- 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 matArg1 matArg2 …’