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Floor load error in STAAD Pro Connect

CDLD

CDLD

Structural
May 20, 2020
237
I've encountered quite a dangerous error using "floor loads" in STAAD pro Connect and would like to see if anyone has had a similar issue.

Below is a snapshot of a ~105 ft stair tower where I've grouped all the landings as a floor group.
I applied a floor live load to this group of 4.79 kPa (100 psf).
You can see from the loading animation that the floor load seems to be correctly applied to all landings.
1746538407286.png

However, when looking at the support reactions it is obvious that the program is considering the loading from one landing only (instead of 12 landings)!
The total live load for all 12 landings should be approximately ~135 kN.

1746538516210.png
 
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Each floor should be at one elevation only. Doesn't the software give you a running when running analysis?
 
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Yeah exactly, I've separated each elevation into separate groups and it works as expected.

There was no warning provided.
The danger is that the UI displays the loading as if it is properly distributed to all landings.
 
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Good to see that you are reviewing the programs output for sanity checks.

I am curious if you were able to resolve this issue?

A couple of questions come to mind:
Did you use area load command?
Are all joints connected?

I am old STAAD user, never used the connect version, and I prefer to use the text editor to create my models. Sorry as I am old school.
 
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I was able to resolve it by separating each landing into separate "floor groups" and applying a floor load to each of the groups.
I used the floor load command rather than the area load command.

I'm not sure what you mean by "are all joints connected".
 
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Cool.

Yes, in the past, we used to import a model drawn in CAD into STAAD. if the joints were not 100% connected, the model would have a disconnection errors. Obviously, you did not have that issue.
 
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Correct, no issue there.
 
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