Soil Reactions are 50% of applied load

[keith483GL]

I am attempting to model an uncommon situation with a ground bearing slab. To get to grips with how ROBOT models soil support I have a set up a simple model to test it is working as I wish.

I have encountered a problem in that my applied UDL panel load of 30kN/m^2 is resulting in a soil reaction of 15kN/m^2.

I have checked the reactions table. It is telling me that the values add up to 180kN, whereas they should add up to 360kN. The slab area is 2m x 6m, so (2 * 6 * 30) = 360kN.

Does anyone know why this is and how to resolve it?

Thanks,

Keith

[Krzysztof_Wasik]

Hi @keith483GL 

Could you  share your model for verification?

[keith483GL]

Hi Krzysztof,

I have tried to drag and drop the model file, but it is coming up with an error. 

Am I doing something wrong? 

Thanks,

Keith

[Krzysztof_Wasik]

Hi @keith483GL 

Save model as RTD without results and zip before sharing.

[keith483GL]

Hi @Krzysztof_Wasik

I hope this works.

[HoshangMustafa]

Hi @keith483GL 

Please find this fthread:

https://forums.autodesk.com/t5/robot-structural-analysis-forum/tables-sum-of-values/m-p/3347985

[Krzysztof_Wasik · Accepted solution]

Hi @keith483GL 

You have duplicated supports

1- support is defined in thicknes definition (elastic soil parameters)

2.- support is defined as planar support

They should not be used together. Remove planar supports . Then slab will be supported by elastic soil defined with slab thickness and results will be as expected. 

[keith483GL]

That's sorted it @Krzysztof_Wasik 

Thanks for your help and assistance.