Hello there,
I want to design a T Beam made out of reinforced concrete.
I have modelled the plate as a shell and the beam as a line component. I then combined the two in the assemble component to get my cross section, similar to the example “Beams and shells” in the tutorials on the website. It is supposed to be a single-span beam, so in itself a very simple example. The supports are hinged and cannot absorb any moments. However, if I then display the internal forces for the beam, I get a moment at the support. However, no moment should arise there. What am I doing wrong?
Many thanks for your help.
Hi, did you try to simply make a I beam where the bottom flange is the same as the web thickness, then you can make a simple T shaped beam. Maybe the shell connection to the beam is causing internal moments in your beam.
Yes, that is one way to solve my problem. But, in the next step, I need the composition from the shell and the beam because I want to create a ribbed slab system with the rips according to the prinicpal moment lines, so the shell cross section is variable.
can you share the definition because it is difficult to troubleshoot with only text descriptions
Yes, of course. Attached is the version with the I cross-section and the composite cross-section.
I also have the problem that the forces and moments in the beam are not transferred to the next segment. I have tried to solve this with the Joint Agent, which I found in another forum post.
My aim is for the distribution of the composite cross-section to correspond to that of the I cross-section.
Thanks again for your help!
Beam_Moment distribution.gh (98.6 KB)
Dear, @FLML,
the eccentricities and the beam-pieces are rigidly connected and act like small frames. This is why small bending moments result at the ends of the simply supported system. Adding hinges at the ends of the beam-pieces makes the moments vanish at the supports:
Beam_Moment distribution_cp.gh (97.3 KB).
– Clemens