topic Re: Detailed Maps vs Complex W&A Maps in Robot Structural Analysis Forum

Detailed Maps vs Complex W&A Maps

Anonymous — Fri, 13 May 2016 22:17:23 GMT

Hi,

I have two different moment values I can work with for concrete design. Detailed Mxx Myy Mxy, or Complex top/bottom x/y moments.

As you can see in my attached model - I have heavier values when I choose the W&A option vs the Detailed Mxx and Myy. Please advise what would be best used to approximate the values for concrete moments? And if the material was steel?

Thanks!

Shanta.

Re: Detailed Maps vs Complex W&A Maps

Anonymous — Fri, 13 May 2016 22:55:36 GMT

Also, another question I forgot to ask, would it be advisable to add a rigid link from my 18" slab to the 12" wall? I notice high concentrations of moments where there's a large variation in thickness at the interfaces. Same model as the first post.

Thanks.

Re: Detailed Maps vs Complex W&A Maps

Artur.Kosakowski — Mon, 16 May 2016 08:11:25 GMT

Please advise what would be best used to approximate the values for concrete moments?

The W and A moments include the influence of Mxy moments and they should be used for bidirectional slabs.

And if the material was steel?

Then IMHO you should check the values of von Mises stresses instead.

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Re: Detailed Maps vs Complex W&A Maps

Artur.Kosakowski — Mon, 16 May 2016 08:23:53 GMT

You need to be careful with selected direction (should be the same for all the panels you display results for) and settings for smoothing.

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Re: Detailed Maps vs Complex W&A Maps

Anonymous — Mon, 16 May 2016 16:23:41 GMT

Thanks Artur. I wasn't too sure if I were to keep all panel directions the same. Reason for that is - I have radial bars and hoop bars being used in the thickened edges - whick transitions to grid patterns for the rebar over the inside panels and roof slab for easier installation.

Would the moment values based on same panel direction still be okay regardless of the rebar layout? Thanks.

Re: Detailed Maps vs Complex W&A Maps

Artur.Kosakowski — Tue, 17 May 2016 06:40:56 GMT

My point is that looking at the results you should project them on the same directions when you look at the edge of the two panels so that you compare the same kind of values. The projection of the results is (can be set and changed at any time without the need of re-calculation of a model) indepedent(ly) of the directions of the local X axes of panels (which you may want to set in the way it is easier for you ta apply loads) and their directions of the main reinforcement (which follows your intended rebar distribution).

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