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Dear Salvador,
I will work on a code update to make this work.
I'll post here as soon as I have the solution.

Diego

I think the error is due to the non latin characters in your system.
Maybe it cannot decode "/" character?

When I run write_tcl in your file I obtain the error on surface load that you can see in this picture:
https://ibb.co/T476Qkp

The error is due to the fact that you created multiple surfaces ...

I totally agree with @STKO team .
I just want to add a couple of more comments: the fact that compression or tension arises on your beam depends also on the boundary conditions you are applying.
If you apply two moments at the extremity that stretches bottom fibers the top part of the beam would ...

Dear Gokki,
I suggest to take the following modifications to your model:
1) I see that you created several surfaces for surface load. Can you create only one surface for each span of your frame? The surface load distributed the load to its edges (unless you exclude them explicitly). If you create ...

Hi,
Fracture energy is defined as an energy per unit area. So basically it is [Force]*[Length]/[Length]^2. Thats why in Model code you find that in N/m (or equivalently in J/m2).
The area under a stress-strain curve is the specific fracture energy , so it is in [Force]/[Length]^2 (for instance N ...

Dear user,
you are right, indeed the original model by Mander et al. considers the clear distance between longitudinal bar in order to define the ineffective confined concrete. Furthermore the same is true in the other plane taking into account the distance between the stirrups.
On the other hand ...