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Local Axes in ETABS

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Posted on May 4, 2010 by zstructures — 1 Comment ↓

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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. Local axis 3 is perpendicular to the line object. The direction of the positive local 3 axis is determined from

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applying the right-hand rule using the directions of the 1 and 2 axes described in the preceding bullets.

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

Assigning Pier

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

and Spandrel

orientation:

Labeling in ETABS

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

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onto the global X-axis, the positive direction of the local 1

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axis is the same as the direction of the positive global

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Y-axis.

Beams

Local axis 2 is perpendicular to the line object. The positive local 2 axis points in the same direction as the

Burj Khalifa -

global Z-axis, upward.

Height

Local axis 3 is perpendicular to the line object and is

comparison

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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Other (neither vertical nor horizontal) Line Objects. For line

Structures

objects that are not vertical and are not horizontal, the local axes

Local Axes in

have the following default orientation:

ETABS

Local axis 1 is along the line object. The positive local 1

Earthquake

axis has an upward sense. The projection of the positive

Load

local 1 axis onto the global Z-axis is in the same direction

Calculation

as the positive global Z-axis, upward.

(base Shear

Local axis 2 is perpendicular to the line object. The local

method)

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.

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Local axis 3 is perpendicular to the line object and is

Non Linear

horizontal. The direction of the positive local 3 axis is

Static (Or

determined from applying the right-hand rule using the

PUSHOVER)

directions of the 1 and 2 axes described in the preceding

Analysis

bullets.

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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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