CSI ETABS - 12 - Local and Global Axis (Moment 3-3, Moment 2-2, Shear 2-2, Shear 3-3) part 1

In this lecture, Global (xyz) and Local axis (123) in ETABS are discussed.
DETAILS:
The local axes color convention for joints, frame elements, shell elements, etc. is as follows:
local 1 axis: red
local 2 axis: green
local 3 axis: blue
Local Axes - Frames::::::::
By default the local 1-axis of a frame object extends from the i-end of the element to the j-end (Along the length of the member). The default orientation of the local 2 and 3 axes depends on the frame-type (column, beam or brace) and in some instances the orientation of the frame element itself.
The default local axes orientation for frame objects is different for
Vertical Frame Objects:::::: ))))))))
Local axis 1 is along the frame object. The positive local 1-axis is in the same direction as the positive global Z-axis, upward.
Local axis 2 is perpendicular to the frame object. The projection of the positive local 2-axis onto the global X-axis is in the same direction as the positive global X-axis.
Local axis 3 is perpendicular to the frame object. The direction of the positive local 3-axis is determined from applying the right-hand rule using the directions of the 1 and 2 axes described in the preceding bullets.
Horizontal Frame Objects:::::: ))))))))
Local axis 1 is along the frame object. The projection of the positive local 1-axis onto the global X-axis is in the same direction as the positive global X-axis. If the frame object is parallel to the global Y-axis such that there is no projection onto the global X-axis, the positive direction of the local 1-axis is the same as the direction of the positive global Y-axis.
Local axis 2 is perpendicular to the frame object. The positive local 2-axis points in the same direction as the global Z-axis, upward.
Local axis 3 is perpendicular to the frame object and is horizontal. The direction of the positive local 3-axis is determined from applying the right-hand rule using the directions of the 1 and 2 axes described in the preceding bullets.
Other (neither vertical nor horizontal) Frame Objects:::::: ))))))))
For line objects that are not vertical and are not horizontal, the local axes have the following default orientation:
Local axis 1 is along the frame object. The positive local 1-axis has an upward sense. The projection of the positive local 1-axis onto the global Z-axis is in the same direction as the positive global Z-axis, upward.
Local axis 2 is perpendicular to the frame object. The local 1-2 plane is vertical. The positive local 2-axis has an upward sense. The projection of the positive local 2-axis onto the global Z-axis is in the same direction as the positive global Z-axis, upward.
Local axis 3 is perpendicular to the frame object and is horizontal. The direction of the positive local 3-axis is determined from applying the right-hand rule using the directions of the 1 and 2 axes described in the preceding bullets.
Local Axes - Shell Objects:::::: ))))))))
The local 3-2 plane is taken to be vertical; that is, parallel to the Z axis.
The local 2-axis is taken to have an upward (+Z) sense unless the element is horizontal, in which case the local 2-axis is taken to be horizontal along the global +Y direction.
The local 1-axis is always horizontal; that is, it lies in the X-Y plane.
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