topic Re: Governing load case - steel member calculations in Robot Structural Analysis Forum

Governing load case - steel member calculations

Anonymous — Mon, 23 Jan 2017 15:32:15 GMT

Good day

When i'm calculating the beams and columns in my structure, RSA uses different kinds of loads cases as the governing load case.

Is it possible to change the governing load case? Because i've made a combination with the loads, that should be the governing load case, when i'm designing my bars and columns.

If the post makes no sense, let me know. (This is my first post, and i'm completly new to RSA)

Re: Governing load case - steel member calculations

Rafacascudo — Mon, 23 Jan 2017 15:39:13 GMT

On the steel design calculations dialog window You can choose which load cases and combinations you want your bars to be checked. Then the resulta will correspond to the case that gives the higher ratio

Re: Governing load case - steel member calculations

Anonymous — Tue, 24 Jan 2017 08:47:24 GMT

Thanks for the quick reply.

But it seems like I am only able to use the combination when calculating the displacement. I'm guessing that it's under "limit states" I have to choose which load cases I need to use? And it's only using the SLS i can use my combination and when I do that, ROBOT only shows me the displacement ratio of each bar and column.

Re: Governing load case - steel member calculations

Artur.Kosakowski — Tue, 24 Jan 2017 08:55:42 GMT

You may want to watch the recording of the 3rd Robot webinar on steel design available from:

http://forums.autodesk.com/t5/robot-structural-analysis-forum/robot-structural-analysis-webinars/td-p/5523337

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Governing load case - steel member calculations

Anonymous — Tue, 24 Jan 2017 08:54:19 GMT

Thank you so much Arthur. I'll gladly watch that.

Have a nice day!

Re: Governing load case - steel member calculations

Anonymous — Tue, 24 Jan 2017 12:05:03 GMT

Well the video didn't exactly solve my issue. But a great learning video for me, as my university doesn't provide that kind of learning.

I figured it out myself. I remembered, when I made the combination myself, I made it as a SLS combination, therefore i coulnd't use it to calculate the ULS (duuuh). So i've corrected the issue, and now it's calculating as it's suposed to.

Again, thanks for the help guys.

Re: Governing load case - steel member calculations

Artur.Kosakowski — Tue, 24 Jan 2017 12:13:04 GMT

Well the video didn't exactly solve my issue.

Re: Governing load case - steel member calculations

Anonymous — Tue, 24 Jan 2017 12:46:33 GMT

well... 😄

My bad, must have missed that part, or perhaps not understood it to its fullest extend.

Again, thank you very much.

Re: Governing load case - steel member calculations

Anonymous — Wed, 25 Jan 2017 14:54:14 GMT

When i'm doing the calculations for the beams and columns, should i use "floor" or "claddings"? Because when i'm using floor, the deflection and ratio is lower in regards to when i'm using cladding.

Re: Governing load case - steel member calculations

Rafacascudo — Wed, 25 Jan 2017 14:58:55 GMT

Because floor (meshed panel)is a structural element.
Cladding has no structural function. It serves only to distribute the load to bars and walls following the triangular and trapezoidal method ( tributary areas)

Re: Governing load case - steel member calculations

Anonymous — Wed, 25 Jan 2017 15:31:19 GMT

Thank you very much Rafael (Y)