Node Local Axis
Declare a local coordinate system for selected nodes to enter boundary conditions or produce output for reactions.
From the Main Menu select Boundary > Etc. > Node's local Axis.
Click 
to the right of Node Local Axis: Display the Node Local Axis Table
Options
Add/Replace: Enter or replace a local coordinate system for selected nodes
Delete: Delete previously entered node's local coordinate system for selected nodes
Define Local Axis
Input Method: Select a method of specifying the node's local coordinate system.
Angle: Specify 3 angles of rotation to define the node's local coordinate system
about x: Angle of rotation about GCS X-axis
about y: Angle of rotation about y'-axis rotated about X-axis
about z: Angle of rotation about z"-axis rotated about X- and y'-axes
3 points: Specify 3 nodal coordinates to define the node's local coordinate system
P0: Coordinates of the origin of the node's local coordinate system
P1: Coordinates of an arbitrary node on the node's local x-axis
P2: Coordinates of a node moved from P1, parallel to the node's local y-axis
Vector: Specify 2 vectors to define the node's local coordinate system
V1: x-direction vector starting from the origin of the node's local coordinate system
V2: Vector starting from the origin of the node's local coordinate system to the point P2 of the 3 points method above
Line Vector: Specify a reference line to define the node's local coordinate system.
Direction: Select the component of node local axis. Selected component will be aligned into the orthogonal direction of the reference line.
Ref. Point: Specify 2 nodes to define a reference line.
P0: Coordinates of the origin of the reference line
P1: 2nd point of the reference line to determine the direction of reference line.
Global Direction: Specify a origin point and global axis to define a reference line.
P0: Coordinates of the origin of the reference line
P1: Component of the GCS axis to determine the direction of reference line.
Note
The following are the application functions for Node Local Axis:
"Supports"
"Point Spring Supports"
"General Spring Supports"
"Surface Spring Supports" (in case of Convert to Point Spring)
"Specified Displacements of Supports"
"Reaction Forces/Moments" of "Reactions"
"Reactions" of "Influence Lines"
"Reactions" of "Influence Surfaces"