error in graph for circular hollow section (chs)

[flopez]

Hi guys.

I have been using the hollow section (chs). While the dialog input box asks for the "diameter" of the section, it appears that what is plotted in the graphical interface takes that value as the radius, and therefore, the plotted section is much larger than it should be.

Question: Is this a graphics problem only? Or should I assume that the input dialog box means "radius" instead of "diameter"?

Thanks

[ricardomonteiro]

Hi flopez.
Which SStruct version are you using? I am using 5.0.5, build 10, and I find the graphical interface for 'chs' to be in agreement with the input data.
Ricardo

[flopez]

Hi Ricardo.

I am also using 5.0.5 build 10. I double checked and still get the same problem.

One way to visualise the problem is to create two elements each with sections of the same diameter: one circular holow section (CHS) and one reinforced concrete circular hollow section (RCHS). You will observe that in the graphical interface they are not plotted the same size, with the CHS section significantly larger than the RCHS.

[ricardomonteiro]

Hi!
Now I got it. I had compared a circular hollow section, (CHS) with thickness very close to the section radius, to a circular solid section (CSS) of the same diameter and both were consistent. Comparing these with a reinforced concrete hollow section (RCHS) there is indeed a graphical difference.
In any case, I've run a simple test, submitting three columns, made up of the three different mentioned cross sections, to the same axial loading. I've checked the stresses and, apart from the expected residual differences, they were pretty much the same. I believe, therefore, that we're facing a graphical bug, only.
Cheers,
Ricardo

[flopez]

Ricardo,

Thanks you for your inputs here. I agree with you, it is most likely a graphical issue.

Bye

[seismosoft]

Flopez, Ricardo,

Thanks for signalling this matter to us. There is indeed a small graphical bug in the plotting of these circular sections, which we will correct in the next release of the program.

Thanks again.

Seismosoft Support