actually I know that two load step should be defined . But after load step 1 ( constant axial load ), when the second load step starts, the constant axial load is omitted . so how can I carry it on?
Thanks Hung Pham, but unfortunately I don't . The beam has an axial load for example 100 KN , and a vertical load is on the beam for example 80 KN . The 80 KN load will gradually apply through the loadsteps, but 100 KN is constant throgh the load step . how can I define it ?
One thing you could do is define a function for the constant load. Go to Parameters, then functions then define/edit and then select Multivalued function based on regime variable and have that regime variable be time. Now by clicking on Regime 1 you can define a function for the load for any time step you want. In your case since you want a constant load simply put that from 0 to your final time step (say 5) you want the result to be a constant value (say 100). Now save the function and then by going to Parameters then function then read from file you can read it from wherever you saved it. Now when you apply a load to a beam, instead of entering a value just click on existing table and the function you've defined will show up under whatever name you gave it.
I hope I was able to explain this well enough. It may seem like a lot of steps, but the good thing is this way you can apply the load in any way that you want (stepped, ramped, constant, parabola, etc) for any load that you want (displacement, force, etc).
Dear Samir Mizyed
Thanks a lot for your helpful information . I tried this on a cube with a pressuer . I also put another pressure on this cube, but the seconed pressure is varying throgh substeps . The supports reaction is less than summation of two pressures. Why is that so? I attached the file .
Hi Arash, for some reason I don't see the attached file. Have you tried applying the load as a point first (say apply it on a number of nodes)? At least that would help narrow down where the problem is occurring.
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