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## Robot Structural Analysis

Valued Contributor
Posts: 82
Registered: ‎02-07-2012

# Steel vs. Aluminium design

1189 Views, 4 Replies
02-17-2012 12:14 AM

Hi all,

I'm having trouble designing a beam made of aluminium.

The beam in 5.02 m long, has two pinned suppports, several forces (KN/m - linear distribution) and a few combinations. Calculation is to be made in 2D XZ plane. Everything is ok so far. Calculation and diagrams look ok, but when i perform the steel/alum design i have a problem.

It seams that if the material is steel, the design verification is correct, but when i change the material to Alum, I get the internal axial value NEd = 0 and no buckling verification.

I'm probably doing something wrong....

Attached a picture and the rtd file.

Also I would like to ask what are the the values underlined with green in the picture. some coordinates?

Product Support
Posts: 5,111
Registered: ‎12-17-2010

# Re: Steel vs. Aluminium design

02-17-2012 02:14 AM in reply to: jo2ny

Also I would like to ask what are the the values underlined with green in the picture. some coordinates?

Position of the verification point where the ratio is the highest.

no buckling verification.

Tension force in bar.

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.

Artur Kosakowski
Valued Contributor
Posts: 82
Registered: ‎02-07-2012

# Re: Steel vs. Aluminium design

02-17-2012 04:03 AM in reply to: Artur.Kosakowski

Got it,

Thank you very much!

Contributor
Posts: 23
Registered: ‎08-18-2011

# Re: Steel vs. Aluminium design

02-17-2012 05:07 AM in reply to: jo2ny

Strange no one mentioned that aluminium member should be verified according to EN 1999-1-1 rules not EN 1993-1-1, which, the last time I checked, not implemented in Robot

Product Support
Posts: 5,111
Registered: ‎12-17-2010

# Re: Steel vs. Aluminium design

02-17-2012 05:14 AM in reply to: Участник

Can be if sombody decides to run such check in Robot (possibility rather than being told to do this)

Artur Kosakowski