Moment Diagram

[Michele100100]

Hello,

it seems something is not correct in Moment diagram at columns n.16, n.17 and n.61. Why there is Moment on top and is not Zero?? 

Below realeses in the structure and Moment Diagram on the columns:

Thanks

[okapawal]

@Michele100100 

Bending moments in columns 16 and 17  may come from torsional moment in the arc beam if you blocked Rx at both ends.

Column 61 has fixed connection to the beam 53.

[Michele100100]

Hello,

ok fixed at column 61 with beam 53. 

For column 17, how can I solve? If I dont fix both ends, the calculation give me back an error 3060.

Thanks for your help anyway!

[okapawal]

Share the model if you can.

Zip it and attach here.

[Michele100100]

Attached the model

[okapawal]

Hi @Michele100100 

The error message comes from modal analysis.

But the model is not stable.  The arc is a mechanism with these releases. 
Run just a self-weight load.  You will see displacement in kilometers

One more hint.  If you want to convert self-weight load case to masses, then you need to check "Disregard density" in modal analysis.  Otherwise the self-weight mass is duplicated in modal analysis.

Alternative solution is not to convert self-weight load case to masses and leave unchecked "Disregard density".

[Rafacascudo]

[Michele100100]

Thanks!

[Michele100100]

I tried to do that, but I have Moment in the side where Rx is Blocked.

There is any other way I could try? I have tried with partial stiffness but still having a moment on top of the column.

Thanks

[Michele100100]

Column 17 released, column 16 blocked

[okapawal]

You may apply pinned release at the top of the column.

[Michele100100]

I tried, and I dont know why, but I could make it work only for column 17, but I still having a Moment on 16

If I trying releases at same way of 17 on column 16 I have an instability.

[Michele100100]

Hi @okapawal,

I was checking on that curved beam, and how you say there is a big displacement. Do you have any advise on how to solve?

Thanks