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Hello Everyone!


I am doing a response spectrum analysis an like to retrieve a eigenvalues and vectors from normal modes analysis which has already done. I hav saved the eigen value using  EIGVNAME = modes and  EIGVSAVE = 100. The file is has saved as modes.100.eigv.

While doing RSPEC, I retreived the eigv using EIGVRETRIEVE = 100 and same EIGVNAME. But Solving throws an error as,


  *** ERROR # 372 ***
  Number of MPC constraints in file modes.100.eigv 474
  does not match current value 0.


Can Someone figure it out .


Thanks in Advance



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To add a point, I have created 79 pretension bar elements. 

In modal Anlaysis, I have found the preloaded/ pre stressed modes.


This 79*6 = 474, is doing something, that I am un able to figure out.

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Hi Rahul, 


Thanks. But I have no problem in solving modal analysis with preload.


I have to do a response spectrum analysis, for which I have to use the preloaded modes.

I have saved the eigv file on the modal analysis. On retrieving the file using Eigen retreive in RSPEC analysis throws an error as I mentioned above.


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