Axis Systems

Within SCIA Engineer the Cross-section Characteristics are referenced to three distinct Axis systems.

1. The UCS or 'Input' Axis system is defined using an arbitrary origin and uses a horizontal Y-axis and a vertical Z-axis. This system serves as a reference from which the center of gravity is calculated.
2. The LCS Axis system has its origin in the center of gravity and YLCS and ZLCS axis parallel to the axis of the UCS system. This system serves as a reference from which the rotation of the principal axis is calculated.
3. The Principal Axis system has its origin in the center of gravity and principal y- and z-axis rotated according to the angle of rotation between the principal and LCS systems.

The following picture illustrates these different Axis Systems:

In case the rotation angle of the Principal Axis system is zero, this system is equal to the LCS Axis system. In this case, only the Principal Axis system is displayed.