Advice for Structure Modeling 1

[Alves21]

Hello fellow engineers. I am working on a big structure that at some point will have a truss beam connecting in the web of other beam that is transversal to it. Since I am working with a 3d analysis I am a little confuse on how to model this situation on the software. I've attached 3 pictures to better explain.
In picture one there is a 3d representation of what I am trying to design, the connection will be either bolted or welded, yet tbd.

In picture two is my first idea of how to represent that in my software. I designed the truss as it was over the beam and put a compression member at the end that represents the plate i will be using to fix my truss.

Picture three show another way I thougth though I am not so sure about it. I ve created a member that connects at middle both top and bottom chord to the beam.

What do you guys think about this, are any of those close to beeing a good representation of this situation or both are actualy wrong?

 

[skeletron]

Picture 3 probably shows the closest to the actual situation since the top chord is framing above the beam COG and the bottom chord is framing below. I would model the vertical beams as offsets, and do a rational analysis on the connection design instead of trying to get the model to give the answer.

 

[Lomarandil]

Either should be pretty close, #3 is slightly better, but unless you have significant torsional stiffness in the supporting beam I don't see it making a difference for most practical designs.

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just call me Lo.

 

[ThomasH]

Hi
What is the purpose of your model?
If you just want to transfer vertical load from the truss to the beam either will prabably work, if you have the correct releases. But if you want to check something more complex you may need a different modelling approach.

Thomas

 

[Alves21]

Thanks for answers. Thomas, mostly I want to find loads acting on top and bottom chord and on the beam in order to design the connection and members, so mostly yes, transfer load from truss and make sure the axial loads on the trusses are correct.