Cantilever wih FRAME element

[SandeepNagaraj]

Dear Admin,

Im trying to solve a simple cantilever beam with a concentrated load on the free end using the frame element. Im trying to use the FRAME in both 2d and 3d space. I have no problem with the 3d execution as the results match my hand calculations. But somehow, my results for the 2d frame does not match (Only the rotation dof is matching - -3.9063E-3 ).  It would be really helpful if anyone could inspect my input data and point out the fault init. I really wish to learn.
 
******************************************************************
feap * * Cantilever beam with concentrated load on free end
0 0 0 2 3 2                                ! 2d frame,3dof/node,2node/element
                       ! Termination
COOR                   
 1 0   0.0 0.0  0.0
 2 0 500.0 0.0  0.0
                       ! Termination
ELEM
 1 0 1 1 2
                          ! Termination
BOUN
 1 0 1 1 1
                       ! Termination
Forc
 2 0 0.0 -1000.0 0.0                       ! Ux,Uy,Rz
                              ! Termination
MATE 1         
 FRAM                     
 ELAS ISOT 200000.0 0.3                                 ! Youngs moduls,Poisson's ratio
 CROS SECT 1200.0 160000.0 90000.0 0.0     ! CrossSection,Ixx,Iyy,Ixy
                              ! Termination
END                                        ! End of mesh data
INTE                                       ! Interactive mode
STOP                              ! End of file
******************************************************************

Regards,
Sandeep N.

[Prof. R.L. Taylor]

There are several frame elements.  Some use linear interpolation along the length and some use cubic ones.  Also some have shear deformation and some use Euler-Bernoulli theory (small displacement ones).

Try adding the command SHEAr OFF  to the material set.  You will get linear theory (Euler-B beam theory) with cubic interplations. End displacement should be exact