Coordinate system of joint
The coordinate systems of joints are used for the definition of rotated supports in joints. These coordinate systems have axes XS,YS,ZS. The origin of this coordinate system is in the joint. The coordinate system is defined by the point in the positive part of the axis XS and by the point, that lies in the plane XSYS (where the coordinate YS is positive). The axis Zs is given by the rules for a right-hand Cartesian coordinate system. Any joint may contain only one coordinate system.
These three points that specify the coordinate system cannot be in line or have identical coordinates.
This option is useful for cases, where the reactions in the support has to be obtained in the rotated coordinate system or where the structure is supported in certain direction that is not parallel to the global axes.
Window "Joint coordinate system"