Differential deflection

[Muhammed.OPERA]

Hi everyone,

I'm modeling a simple building in the 3D Building Module, it's a 10 story building with a perfectly identical plan on each story and identical in the mesh and the loads and with heights too.

But the thing is that the deflection changes from a story to another up we go the values is going high.

Is there any particular reason for that change?

What's the best thing to do? and which one should i use to design?

I prefer of course 1story slab in designing slabs but i'm confused about that difference.

[Artur.Kosakowski · Accepted solution]

Hi @Muhammed.OPERA

You may find this topic helpful:

https://forums.autodesk.com/t5/robot-structural-analysis-forum/load-sequencing-construction-stages/m...

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[Muhammed.OPERA]

Hi @Artur.Kosakowski

To clarify things up:

I have watched the screencast, I'm not using phases.

This means that the attached values in pictures is incorrect or not (i'm confused about that).

If i didn't define phases of construction and let the own weight as it is what cause the change ? till now i didn't get it?!

[MartinTrs · Accepted solution]

Hi @Muhammed.OPERA

Without phases the model is calculated as if the building was built and loaded instantly. So the compressed vertical structure's (walls and columns) deformations are summed story by story. This means that on top levels the slab are excessivley moved downwards by the shortening deformations of walls and columns. Those deformations are also reflected on the slab's displacement maps because the displacement map shows you the difference between the initial and final position of the displaced node on the slab.

When dimensioning vertical elements I try to keep the stresses in each element similar to each other. This causes relatively similar deformations of each column and wall. This is important so that you could create just one model to calculate the slabs on each story. Otherwise if the columns and walls have too different deformations you might need to take into account the effect of imposed displacements

[ledinhchinh0409]

@MartinTrs

What other load will we assign? Is not after modeling finished? Can you make a video for a real 3D model featuring "dead" and "live" types?