topic Re: reduced wall stiffness in Robot Structural Analysis Forum

reduced wall stiffness

saclovitzky — Tue, 01 Oct 2024 08:23:33 GMT

Hello,

I am trying to reduced the stiffness of rc wall in order to check horizontal deflection.

Is putting values of 0.5(f22) for both membrane and flexural stiffness correct(pls. see attached screenshot and model file)?

I've tried to run the calculation with this value but I received multiple type 1 warning.

Any help will be greatly appreciated.

Re: reduced wall stiffness

saclovitzky — Tue, 01 Oct 2024 12:51:37 GMT

anu comment Simau, Rafacascudo?

Re: reduced wall stiffness

Rafacascudo — Tue, 01 Oct 2024 15:38:12 GMT

This one is classic . You have set the orthotropy direction of some panels on the global X direction while your walls lie on the global YZ plane.

You also have incoherent meshes

Re: reduced wall stiffness

Stephane.kapetanovic — Wed, 02 Oct 2024 04:16:46 GMT

hi @saclovitzky

to refer to what @Rafacascudo says about inconsistent meshes, simply modify the points on the edges of panel 130[1][6] with 143[3]. For 130 you can delete the intermediate point.

Best Regards

Re: reduced wall stiffness

saclovitzky — Wed, 02 Oct 2024 09:04:17 GMT

Thanks Rafa for the reminder(I overlooked it , corrected it and works fine),also can you comment whether putting 0.5(f22) for both membrane and flexural stiffness are the correct set-up for reducing the stiffness of rc wall by 50%.

Re: reduced wall stiffness

saclovitzky — Wed, 02 Oct 2024 09:04:51 GMT

Thank you Stephane

Re: reduced wall stiffness

Rafacascudo — Wed, 02 Oct 2024 11:48:14 GMT

it seems so, Just check if 22 is the direction you want reduced . Just try, setting it as 1 , 0,5 and zero and check if the results are logical

more information about these values here

https://help.autodesk.com/view/RSAPRO/2025/ENU/?guid=GUID-A27B3B93-40F0-4D88-91CC-0AA50F6F52B5