Pushover analysis error

[STKO Team]

It looks like you assigned a load to a node that belongs to a geometry without any element assigment. If a geometry does not have an Element Property, it will not be translated to an OpenSees element.

[felicegiordano95]

How should I assign the horizontal load?
As, as previously said, I am developing the analysis by considering the deformability of the diaphragm.

[STKO Team]

Are you referring to "How to assign horizontal loads for a pushover if you don't have a rigidDiaphragm"?
It really depends on your structure, and it is not a numerical issue.. it is more a theoretical one

[felicegiordano95]

I entered the horizontal load in the following way, but nevertheless it generates an error during the analysis.
Therefore, I am sending you the inherent file.

[STKO Team]

I've just seen your model,
it is singular because your second geometry (travetti) is detached from the other.

One more question, you are using the SurfaceLoad utility on a shell which is physically modelled... If you model the slab then you need to use the FaceForce, while the SurfaceLoad is applied on a geometric surface when you don't want to model the slab.

What approach do you want to use?

[felicegiordano95]

Should i merge the geometry? Also because I can't do it ..

I don't know what kind of approach to use, which one do you suggest? I had thought of applying the seismic forces directly in the lateral nodes of the structure .. tell me which one could be the best.

Thank you

[felicegiordano95]

And anyway, if I start the analysis, the analysis error I sent earlier always appears in the image.

[felicegiordano95]

I am attaching the updated file

[STKO Team]

Dear user,

here is your model which is working fine now

Esempio 3.1.scd.zip

(1.9 MiB) Downloaded 190 times

There were still few errors that we fixed:

• travetti and main-structure geometries should be merged
• I had to add a few more construction lines in the merge operations to guarantee a quad mesh
• Master node geometries should be removed, because you don't have rigidDiaphragms, so those nodes will be unconstrained
• I added a other constructions lines in the slabs such that their interactions generate a vertex at the center of each floor, where the master nodes were. Just to use it as a monitor for top displacement.
• beams had a hinge-integration scheme, but now that they are merged with the slab, and therefore meshed, that integration rule is not applicable anymore, so I converted them into distributed (Lobatto) rule with 3 points each one.

Also note that you are doing a pushover in X, but your nodal loads are applied to a face parallel to the X axis, so your model is rotating.. I don't know if this was what you wanted.

[felicegiordano95]

Hello, I wanted to ask you how I can visualize the voltages inside the plate elements and how to extract the results.
Also I wanted to ask you if it would be better to lower the joists (travetti) and make them coincide with the upper edge of the plate.