1 Topic by dcc (edited by dcc 2020-04-24 08:42:58)

  • dcc
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  • Registered: 2020-04-24
  • Posts: 3

Topic: L-D diagram decreasing values

Dear all,

I have been examining 3D shell model for bridge deck. However I have problem with convergence and consequently with L-D diagram in a way that after the peak load is reached the convergence can not be reached and values in L-D diagram are faulty. I am using arc-length and I have increased the mesh units in thickness of the shell to 4. Since I am modelling just 1/4 of the bridge deck I have translation constraints for symmetry planes and translation constraint in z direction where the grider is supposed to be. I am also applying load on surface. I am following the load and displacement for the mid point of the slab.

https://drive.google.com/file/d/1lmuOkF … sp=sharing

Quote Post 1

2 Reply by pavlo (edited by pavlo 2020-04-24 15:26:07)

  • From: Finland
  • Registered: 2019-03-28
  • Posts: 138

Re: L-D diagram decreasing values

It seems that you haven't reached a peak since the curve is ascending. Double check the step where you obtained the wrong result. Maybe you applied too high load and it was not possible to find a solution.

Do you apply load or displacement control? With arc length only load should be applied.

Also try to subdivide the step which doesn't converge.

Quote Post 2