Beam (Lateral offset)

[Anonymous]

What is the best way to model this situation? Its ok apply a lateral beam offset?

What consequences can bring applying the offset?

[Artur.Kosakowski]

The offsets may cause additional axial force in the beams.

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[Anonymous]

Thanks Artur. This axial force affect the bending moment in a static analysis? Can I ignore the axial force for the determination of required reinforcement in the beam?

Perhaps, in the column the axial force cause an aditional bending moment?

[Artur.Kosakowski · Accepted solution]

See also:

http://forums.autodesk.com/t5/Robot-Structural-Analysis/T-slab/m-p/3185418

http://forums.autodesk.com/t5/Robot-Structural-Analysis/Beam-offsets/m-p/3332921

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[AhmedZA]

hi artur
is it possible to release axial force ( no instabilities after definition of releases )

[Artur.Kosakowski]

Try to release ux (only)  at one side of a bar element.

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[HoshangMustafa]

 Hi Artur

pipiyedu meant horizontal offset instead of vertical offset, i.e, eccentricity on columns.

[Artur.Kosakowski]

Yes, that 's true. The rigid links should be in the horizontal plane indeed. 

[HoshangMustafa]

Hi Artur

Yes, that 's true. The rigid links should be in the horizontal plane indeed. 

So, in this post:

Using horizontal offsets for RC beams don't influence values of internal forces. They don't cause large increase of the axial force (tension) and significant reduction of the bending moment.

Horizontal offset will increase eccentricity (and hence bending moment) on the columns instead.

[Anonymous]

hi

sometime horizontal offset have no influence 

I've worked a comparison between Rigid link and horizontal offsets as you can see the results are identical

[Artur.Kosakowski]

Check axial forces and bending moments in the perpendicular to the displayed direction for the columns and compare them with the model where you neither have rigid link nor offsets. 

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