When to use lumped and when to use consistent mass matrix?

[Artur.Kosakowski]

Originally posted by  @Anonymous in this topic.

Moreover, can you tell me when to use lumped and when to use consistent mass matrix?

[Anonymous]

Thank you for your assistance. I can not accept this as a solution as i am not the author of this post.

[Artur.Kosakowski · Accepted solution]

Hi @Anonymous

The consistent one us recommended for a model where you have no nodes along bar elements and your aim is to find out the exact values of eigenfrequencies (e.g. to avoid a resonance) whereas the lumped for model with many nodes (e.g. multi-story building and seismic analysis) where you need to reach 90% participating mass and the exact shape of vibrations is a secondary objective.

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[Anonymous]

Hi,

I am designing a curved roof structure supported on the main station structure. I have used lumped mass for dynamic behavior calculation. Could you please advise on which nodes will the lumped mass be concentrated? Will it be at each node intersection?

The model is shown below

Thank you,

Mayank