Thermal & Shrinkage Analysis of Concrete Slabs 2

[SRKSTRUCTURE]

Hi All,

I would like to know how to perform Thermal & Shrinkage analysis of Slabs, I use RAM Concept but its not clear how to do the analysis correctly. Is anyone using the same software or any other tool. Please advice.

Regards

 

[dik]

I'm not sure why you would want to do this? Just because you can, is not a really good reason.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[Luceid]

Most of the time you are going to get hit really hard if you do thermal analysis in a 2D software with pinned/fixed base columns and walls as opposed to the flexibility you'll find in the true 3-D building.

 

[SRKSTRUCTURE]

Yes i agree. So what is the right approach for thermal & shrinkage analysis ? If we don't have a 3D model & we are only doing Slab design.

 

[SethGuthrie]

In Ram Concept you can adjust the stiffness of the supports which are columns and walls below the slab presumably. You can control the height, the fixity and the material properties to make the supports a realistic stiffness. You can also put the supports on rollers. The Concept model is a single story/slab with supports above and below, but it's more than a 2D analysis.

There is some help in the program manual regarding the application of temperature loads. They can be used to represent a gross temperature change or a gradient change over the thickness. Care should be taken regarding sign convention and units.

Temperature loads are not automatically included in the design combinations. If you want the temperature loads considered for design, concurrent with other loads, then you will need to manually set the load factors on the desired combinations.

 

[Luceid]

It's definitely possible as Seth mentioned, but the calibration of the walls/columns to "accurately" model the rest of the buildings restraint to temperature is going to be tricky to nail down if your building is any sort of complex

 

[SRKSTRUCTURE]

In creating Load combination to include the thermal stresses in Design, what combinations should be used ? Is it specified in the codes ?