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Plate Deflection calculations blunder

 
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atulsharma2595
SEFI Member
SEFI Member


Joined: 19 Jan 2022
Posts: 3

PostPosted: Mon Oct 10, 2022 6:55 pm    Post subject: Plate Deflection calculations blunder Reply with quote

I am trying modelling a simply supported plate model in staad pro with 1010 mesh with density 25 Knm2 and E2510^6 and comparing it with results of other finite element applications and also with numerical matrix analysis by hand calculations. Both fem app and hand calculations results match but those of csi bridge and staad pro doesn't though they matched with each other.
I was sure of correct modelling and also checked for equilibrium each time, I tried models of other dimensions l b and h as well. Each time fem results and hand calculations matched perfectly.
For example I tried modeling absurd 3550 m plate with 2m depth. Hand and fem  calculation results were 30 and 33 mm at centre resp. But csi bridge and staad pro for same parameters gives 230 mm. For other models also the result are far too variable like this case only. Please I need urgent support. Any reference would be appreciated.


Also how come two csi fem applications give these absurd results for exact same parameters?
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vikram.jeet
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Joined: 26 Jan 2003
Posts: 3714

PostPosted: Tue Oct 11, 2022 2:49 pm    Post subject: Reply with quote

You can also verify deflection results from the famous and useful book " FORMULAS FOR STRESS AND STRAINS BY ROARK AND YOUNG ".
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pvgraju
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Joined: 07 Jun 2020
Posts: 66

PostPosted: Wed Oct 12, 2022 11:06 am    Post subject: Plate Deflection calculations blunder Reply with quote

Dear Sir,

Check out the type of FEM element used in the soft ware. In FEM different types of elements are there. Different types of plate, solid elements etc. Check whether your FEM element used is same in all softwares.

Regards,

P.V.Gavarraju.
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