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by seismosoft
30 Jun 2022, 13:26
Forum: 03-Analytical/modelling capabilities
Topic: Modeling a pin connection between crossing elements
Replies: 5
Views: 59

Re: Modeling a pin connection between crossing elements

Using the elfrm element with releases should not cause numerical instabilities, unless the model is unstable itself. Can you run eigenvalue analysis? Note also that the adaptive pushover with displacement loads (as in the displacement-based adaptive pushover for instance) cannot be employed with the...
by seismosoft
27 Jun 2022, 11:29
Forum: 04-Unexpected behaviour/errors
Topic: Eigenvalue analysis vs static pushover analysis
Replies: 2
Views: 28

Re: Eigenvalue analysis vs static pushover analysis

Depending on the selected Standard, the eigenvalue analysis of the pushover analysis should employ the cracked or the uncracked stiffness. In particular in the European (EC8, Part-3) the American Codes (ASCE 41) the uncracked stiffness should be employed (and in employed in SeismoStruct). Seismosoft...
by seismosoft
06 Jun 2022, 12:32
Forum: 04-Unexpected behaviour/errors
Topic: Big unrealistic spike using infill elements
Replies: 7
Views: 117

Re: Big unrealistic spike using infill elements

You could carry out a search in this form with the 'convergence' or 'divergence' term. You will find plenty of resources. Also there is a section in Appendix A in SeismoStruct's User Manual, called 'Tips to Solve Convergence Problems'
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by seismosoft
06 Jun 2022, 12:29
Forum: 04-Unexpected behaviour/errors
Topic: Unkown Error and Zero diagonal Term
Replies: 3
Views: 54

Re: Unkown Error and Zero diagonal Term

The truss element provides stiffness only in the translations DOFs. It seems that some of the elements are not correctly in rotation (e.g. a member that is by itself a cantilever).
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by seismosoft
04 Jun 2022, 06:40
Forum: 04-Unexpected behaviour/errors
Topic: Big unrealistic spike using infill elements
Replies: 7
Views: 117

Re: Big unrealistic spike using infill elements

It could be a problem with very large loading. You could check (i) if you have specified possible strength reduction in the code-based checks and/or the performance criteria (ii) if you have reached the fracture/buckling steel strain, which is be default 20% (i.e. it is already very large). You can ...
by seismosoft
04 Jun 2022, 06:31
Forum: 03-Analytical/modelling capabilities
Topic: How to simulate the soil-structure interaction
Replies: 14
Views: 3837

Re: How to simulate the soil-structure interaction

The message means that the program cannot achieve convergence, due to instabilities in the model.
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by seismosoft
04 Jun 2022, 06:28
Forum: 04-Unexpected behaviour/errors
Topic: Unkown Error and Zero diagonal Term
Replies: 3
Views: 54

Re: Unkown Error and Zero diagonal Term

The error means that some of the degrees-of-freedom are not connected to the structure, there is no equilibrium and the program cannot find a solution. Make sure that all the members of the model are correctly connected.
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by seismosoft
31 May 2022, 11:38
Forum: 04-Unexpected behaviour/errors
Topic: Big unrealistic spike using infill elements
Replies: 7
Views: 117

Re: Big unrealistic spike using infill elements

What you could do is the following: 1) Check other sources of divergence, if you carry out a search for 'convergence' or 'divergence' in the forum you will find plenty of resources. 2) check if you have step reduction, due to divergence. Check in the Convergence Details tab the locations/elements of...
by seismosoft
31 May 2022, 11:36
Forum: 03-Analytical/modelling capabilities
Topic: How to simulate the soil-structure interaction
Replies: 14
Views: 3837

Re: How to simulate the soil-structure interaction

The message is a warning. It means that there is uplift in one of the footings after the application of the initial (gravity) loading, which is not reasonable. If this is something that you expected, ignore the message
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by seismosoft
11 May 2022, 10:32
Forum: 02-Analytical capabilities
Topic: Inputing Processed Ground Motion Records
Replies: 5
Views: 132

Re: Inputing Processed Ground Motion Records

Kirkaguel, SeismoSelect selects records from the NGA and ESM databased that match a given target spectrum. Because the selection is based on the flat files of the databases, there is no possibility of applying direct amplitude scaling before the selection. After you download the records from the dat...

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