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## Robot Structural Analysis

Contributor
Posts: 15
Registered: ‎03-11-2013

721 Views, 13 Replies
03-16-2013 08:31 AM

I am trying to apply an 80 degree thermal load to the upper surface of an RC Shell but it won't let me specify a temperature in the "surface > thermal loads" window. I can assign a gradient and apply it to the shell but no temperature.

Product Support
Posts: 4,154
Registered: ‎04-26-2010

03-18-2013 12:44 AM in reply to: pringle_de_tom

Rafal Gaweda
Contributor
Posts: 15
Registered: ‎03-11-2013

03-28-2013 05:22 AM in reply to: pringle_de_tom

Sorry for the late reply, I've tried these already... I'm designing a flat RC slab and the option to input a temperature is not available.

I do "load definition", trying both "live" and "temperature" but within both of these the program does not allow me to input a temperature, only a gradient as seen in the image attached.

I wish to apply a temperature of 80 degrees C to the top surface of the slab, I'm designing it within "Plate Design".

Product Support
Posts: 4,154
Registered: ‎04-26-2010

03-28-2013 07:32 AM in reply to: pringle_de_tom

temperature gradient along an element's thickness , along local Z.

Convention:

gradient value -> on top = +half of gradient value , on bottom  = -half of gradient value.

Rafal Gaweda
Contributor
Posts: 15
Registered: ‎03-11-2013

03-28-2013 07:47 AM in reply to: Rafal.Gaweda

So for a slab thickness 650mm where it is desired to have 80 degrees at the upper surface and 20 at the base.... I would specify a gradient of -60/0.65 = -92.31 oC/m and this will simulate the desired affect?

Product Support
Posts: 4,154
Registered: ‎04-26-2010

03-28-2013 08:45 AM in reply to: pringle_de_tom

No,

In such case you have to change structure type on Shell then:

if you consider assembling temperature as 0 deg then:

if you consider assembling temperature as 20 deg then (elements have already temp 20 deg):

Rafal Gaweda
Product Support
Posts: 4,154
Registered: ‎04-26-2010

04-03-2013 03:55 AM in reply to: Rafal.Gaweda

Important : message 6 updated \ corrected!

Rafal Gaweda
Contributor
Posts: 15
Registered: ‎03-11-2013

04-03-2013 07:22 AM in reply to: pringle_de_tom

Thanks a lot for the help!

My slab is 650mm deep does this affect the gradient in any way?

Product Support
Posts: 4,154
Registered: ‎04-26-2010

04-03-2013 07:52 AM in reply to: pringle_de_tom

My slab is 650mm deep does this affect the gradient in any way?

No ;  gradient between top and bottom layers whatever slab thicness is.

Rafal Gaweda
Distinguished Contributor
Posts: 120
Registered: ‎09-17-2012

04-04-2013 12:40 AM in reply to: Rafal.Gaweda

Dear Rafal

What is the meaning of  "assembling temperature" and what is the difference between assembling temperature and  the value of  "dT1" in the "thermal load 3p window" ?

Thanks

Refaat