topic Re: Design beam and support slab in his bottom in Robot Structural Analysis Forum

Design beam and support slab in his bottom

luismrf — Tue, 09 May 2023 17:45:00 GMT

Hi,

i´m designing a beam and i want to support in is bottom a slab ( not on the top), how can i do it in the RSA?

thanks,

luis

Re: Design beam and support slab in his bottom

Simau — Tue, 09 May 2023 18:13:27 GMT

@luismrf

Before meshing, create intermediate nodes in the beam and on the side to be supported of the slab then join them with rigid links.

You may also use "offset"

Re: Design beam and support slab in his bottom

luismrf — Fri, 12 May 2023 17:09:09 GMT

hi @Simau ,

i used the offset, but the results are the same or different using it?

How do you use the regid links?

regards,

Luis

Re: Design beam and support slab in his bottom

Simau — Fri, 12 May 2023 19:09:22 GMT

@luismrf

I don't understand your problem

The results are the same than what ?

Could you show results in both configurations

Re: Design beam and support slab in his bottom

luismrf — Mon, 15 May 2023 13:32:51 GMT

Hi @Simau,

if i use the offset and place the slab in the bottom of the beam i get the same results if i didn´t used the offset?

The offset only changes the model graphically, the results are the same, no?

What i wanted to simulate correctly was to support the slab at the bottoom of the beam ,

regards,

Luis

Re: Design beam and support slab in his bottom

Simau — Mon, 15 May 2023 17:34:35 GMT

@luismrf

Here is a test model showing the differences with and without offset

Re: Design beam and support slab in his bottom

luismrf — Thu, 22 Jun 2023 14:40:27 GMT

Thank you @Simau ,

i have one more question please, how can i make sure that the longitudinal beams get all the load sent from the slab ?!

Thank you,

Luis

Re: Design beam and support slab in his bottom

Simau — Thu, 22 Jun 2023 15:46:28 GMT

@luismrf

You need to create a new thickness with orthotropic material, for example this one in the screenshot

Model attached

Re: Design beam and support slab in his bottom

luismrf — Thu, 22 Jun 2023 21:31:13 GMT

Thanks @Simau,

this was what i was trying to do, placing a linear release along the tranversal beams, but that didn´t worked.. why?

Re: Design beam and support slab in his bottom

Simau — Thu, 22 Jun 2023 22:53:29 GMT

@luismrf

If you have an isotropic slab, the load distribution on the support beams will be done according to the stiffness of these beams. It has nothing to do with the linear releases of the slab.

However if you create an orthotropic slab in the model, it must be orthotropic in reality

Take a look at this thread

https://forums.autodesk.com/t5/robot-structural-analysis-forum/moments-in-one-way-slabs/m-p/11975049

Re: Design beam and support slab in his bottom

luismrf — Mon, 24 Jul 2023 23:28:07 GMT

@Simau i have a situation similar to this above but i don´t have a tickness i only have a cladding because i want to simulate a very light canopy, how can i send load only to the longitudinal beams?!

thanks Luis.

Re: Design beam and support slab in his bottom

Simau — Tue, 25 Jul 2023 09:48:13 GMT

@luismrf

You may use one way cladding which will send loads according to its local axis=

Re: Design beam and support slab in his bottom

luismrf — Tue, 25 Jul 2023 10:21:45 GMT

thank you @Simau

and if i already have a cladding is it possible to edit oit to one way, or do i have to delete the one that i have and draw a new one?

Re: Design beam and support slab in his bottom

luismrf — Tue, 25 Jul 2023 10:33:26 GMT

Thank you simau,

i think i just fixed the problem, in Cladinngs, i just applyed to the one way y and it worked!

Re: Design beam and support slab in his bottom

Simau — Tue, 25 Jul 2023 10:40:36 GMT

You may also change it in object inspector