Local Axes in ETABS _ the Structural Engineering_ an Art

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Local Axes in ETABSPosted on May 4, 2010 by zstructures — 1 Comment ↓

Vertical Line Objects. For vertical line objects the local axes have

the following default orientation:

Local axis 1 is along the line 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 line 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.


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. ETABS 2013

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Horizontal Line Objects. For horizontal line objects (parallel to the

global X-Y plane), the local axes have the following default

orientation:

Local axis 1 is along the line 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 line 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.


positive local 2 axis points in the same direction as the

global Z-axis, upward.

Local axis 3 is perpendicular to the line 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) Line 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 line 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 line 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 line 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.

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About zstructures

I am structural Engineer working in a reputable

firm in Los Angeles

Posted in civil engineering, ETABS, structural engineering, structures,

Technology

One comment on “Local Axes in ETABS”

Tomas says:

May 3, 2012 at 10:51 am

Thanks a lot. I´m just starting in the design of structures and

this was very very helpful.

Reply

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