Help me out please - forces diagram 1

• Jul 4, 2017

• #2

rb1957

Aerospace

Apr 15, 2005

15,682

pinned reactions (then simple) or fixed (then difficult, need more data) ?

another day in paradise, or is paradise one day closer ?

 

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• Jul 4, 2017

1
• #3

jayrod12

Structural

Mar 8, 2011

6,165

Your FEM model would typically take into account the stiffness and strength of each member. I.E. if your beam was majorly stiff compared to the columns, then there's the possibility that the beam eats a bunch of moment prior to dumping it into the columns.

In a perfect world where the beam and column have infinite stiffness I get the following

Axial Load

Moment

Shear

 

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• Jul 4, 2017

• Thread starter
• #4

n3jc

Civil/Environmental

Nov 7, 2016

187

THANKS!

rb1957 - supports are fixed

 

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• Jul 4, 2017

• #5

rb1957

Aerospace

Apr 15, 2005

15,682

and the internal joints too.

another day in paradise, or is paradise one day closer ?

 

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• Jul 4, 2017

• #6

IFRs

Petroleum

Nov 22, 2002

4,651

Why is FEA being used for such a simple structural arrangement?

 

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• Jul 5, 2017

• #7

mats12

Geotechnical

Dec 17, 2016

181

Why is the moment in upper right corner so small - is it because of long cantilever?

Why is FEA being used for such a simple structural arrangement?

Click to expand...

what would you suggestt?

 

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• Jul 5, 2017

• #8

rb1957

Aerospace

Apr 15, 2005

15,682

FEA would solve partial fixity at the corners (due to finite inertia of the members), else fully fixed corners can be solved by hand.

another day in paradise, or is paradise one day closer ?

 

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• Jul 5, 2017

• #9

dik

Structural

Apr 13, 2001

25,738

Col moment at top right would be similar to the beam moment, else, angular acceleration.

Dik

 

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• Jul 5, 2017

• #10

rb1957

Aerospace

Apr 15, 2005

15,682

yes, the moment in the two members at the joint is the same, but it doesn't have to be the fully fixed value (which would say that the joint doesn't rotate) which is my assumption for the solution provided. If it's partially fixed (knowing the stiffness of the column and the beam) then the beam can have some finite slope at the joint and (maybe) there can be a change in angle between the beam and the column (due to their different stiffness, displacing differently due to the same applied moment); this is easiest solved with FEA.

another day in paradise, or is paradise one day closer ?

 

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• Jul 5, 2017

• #11

JoelTXCive

Civil/Environmental

Jul 24, 2016

921

Jayrod- just out of curiosity, what software package are you using?

 

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• Jul 5, 2017

• #12

jayrod12

Structural

Mar 8, 2011

6,165

That was Risa2D.

 

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