ABAQUS #5: 2D Frame with prescribed displacement

[@yopyop3241]

Where did you add the hinge at node 4?

[@leonardoocchipinti8011]

Nice one

[@claudiojouglard6305]

You should not use the B21 element since it is not appropriate for this case where shear deformations are negligible and this element has a very poor approximation to flexural deflections (linear vs cubic) compared to the classic Euler-Bernoulli beam element B23. You can compensate the inaccuracies increasing the mesh density using at least 4 to 5 elements per bar, as in your last mesh, but the B23 element will give exact nodal results with only one element per bar. Also the innacuracies are worse for nonlinear analysis. You can find a very illustrative comparison of shear deformable beam theories in the 1997 paper 'On locking-free shear deformable beam finite elements' of Prof. J.N. Reddy. As a last remark it is misunfortunate that Abaqus has the element B21 as the default beam element, since many users believes that it has the same precision as the clasical element B23 and they use the element B21 inadequately.

[@TMsChannels]

Hi, thanks for the comment! To be honest I haven't dived that deep into Abaqus' element types, so your insight is much appreciated. I expected Abaqus to use the classic Euler-Bernoulli element by default as you states, I would love to know why they chose otherwise. From now on I would definitely use the B23 element.

[@welingtonvital5256]

Which literature was this exercise taken from?

[@anotherperson956]

Thank you

[@bernardfelix358]

Thank you !!!

[@joeysukhi6889]

thank you!!!!!!!

[@abderrahmanecherfa5553]

Helpful, thank you sir