ERROR THE RAYLEIGH FREQUENCY IS LESS THAN 0.00001 FOR LOAD
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12 ماه پیش
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If you analyze your model
If you analyze your model with seismic load generation cases and get the following error...
ERROR THE RAYLEIGH FREQUENCY IS LESS THAN 0.00001 FOR LOAD
Ans: The fact that the software is coming up with a very low value for Rayleigh Frequency indicates that the structural stiffness is very low and more often than not, that is caused by modeling errors. So first and foremost, you should check the model geometry and ensure that there are no disjointed structures, orphan nodes, duplicate beams/nodes, improper connectivity between beams/plates, etc. Subsequently, you should check for specifications that can make the model unstable namely the releases, truss assignments, pinned support assignments, etc. All of these are factors that can contribute towards an ill-conditioned stiffness matrix, eventually causing solver errors. If you have a large model with lots of load cases, it will make sense to comment out all loads and analyze for a single load case with just self-weight and see if the analysis completes without an error or not. Once modeling issues are sorted out and the structural displacements look ok, you may then reactivate the rest of the cases including the seismic ones.
ERROR THE RAYLEIGH FREQUENCY IS LESS THAN 0.00001 FOR LOAD
Ans: The fact that the software is coming up with a very low value for Rayleigh Frequency indicates that the structural stiffness is very low and more often than not, that is caused by modeling errors. So first and foremost, you should check the model geometry and ensure that there are no disjointed structures, orphan nodes, duplicate beams/nodes, improper connectivity between beams/plates, etc. Subsequently, you should check for specifications that can make the model unstable namely the releases, truss assignments, pinned support assignments, etc. All of these are factors that can contribute towards an ill-conditioned stiffness matrix, eventually causing solver errors. If you have a large model with lots of load cases, it will make sense to comment out all loads and analyze for a single load case with just self-weight and see if the analysis completes without an error or not. Once modeling issues are sorted out and the structural displacements look ok, you may then reactivate the rest of the cases including the seismic ones.
12 ماه پیش
در تاریخ 1402/06/28 منتشر شده
است.
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