I've prepared a simple model of a frame to perform a eigenvalue analysis but when I apply nodal constraints to it, response parameters are very desultory.
when I remove nodal constraints the results are acceptable.
I need to apply diaphragm to model for more coplicated analysis and this problem have been desturbing me!
please check this problem.
file is available in this address:
http://www.4shared.com/file/q_8ffyk9/IDA28b.html
nodal constraints error
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seismosoft
- Posts: 1271
- Joined: 06 Jul 2007, 04:55
Re: nodal constraints error
Dear iranstruct,
Apologies for the delay with which we are responding.
You are right, the eigenvalue solver seems to not be handling the constraints in adequate manner; we are currently implementing a new eigensolver which will hopefully not feature the same problems.
We would note in any case that problems with a 2D model may not necessarily propagate into the 3D more complex one one, hence it may be worth to try analysing the latter as well, perhaps starting with smaller 1-2 storeys models.
Seismosoft Support
Apologies for the delay with which we are responding.
You are right, the eigenvalue solver seems to not be handling the constraints in adequate manner; we are currently implementing a new eigensolver which will hopefully not feature the same problems.
We would note in any case that problems with a 2D model may not necessarily propagate into the 3D more complex one one, hence it may be worth to try analysing the latter as well, perhaps starting with smaller 1-2 storeys models.
Seismosoft Support