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Verification of code : Solution and therectical values dont match

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Old   December 22, 2010, 07:54
Default Verification of code : Solution and therectical values dont match
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Vishnu Prasad
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The problem is a I beam (HE 120A Beam) clamped at both ends ( no freedom of displacement or rotation).Length is 3m.The code I wrote is the following :
/PREP7
MP,EX,1,2e11
MP,NUXY,1,0.3
ET,1,188,,,,2
SECTYPE,2,BEAM,I,IBEAM
SECDATA,120e-3,120e-3,114e-3,8e-3,8e-3,5e-3
SECNUM,2
K,,0,0
K,,3,0
L,1,2
KESIZE,ALL,0.1
LMESH,ALL
FINISH
/SOLU
NSEL,S,LOC,X,1
F,12,FY,-30e3
NSEL,S,LOC,X,0
D,1,all,0
NSEL,S,LOC,X,3
D,2,all,0
nsel,all
ANTYPE,STATIC,NEW
SOLVE

I'm getting HUGE differences between the analysis value and theoretical value.( I used the Euler Bernoulli method to solve but even then the answers should be close by at least ). Why is this happening? Is something wrong with the code? Please help.
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Old   December 22, 2010, 08:04
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And even more problematic for me is the modeling of simply supported beams.
When I change the D code line in the code to d,1,uy,0 and d,2,uy,0 and try to execute the same code , nothing happens.No errors in the code , but no nodal solutions available. what am i doing wrong?
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Old   December 22, 2010, 10:35
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Well , I figured out the problem with the first problem.The moment of inertia is getting registered wrongly with the ansys program for some reason. Instead of 5.99e-8 its reading 2.somethinge-8.
Any idea why this is happening?
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Old   December 27, 2010, 05:27
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Vishnu Prasad
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I'm rather disappointed with the lack of response.Anyway , i figured out the problems.Here is the completed report in case any one is interested : http://tinyurl.com/39uoghc at https://sites.google.com/site/vishnukmd7/

Last edited by vishnukmd7; January 3, 2011 at 06:48.
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