model from s2k file

[kengawk]

With Andreas’s helps,I import a s2k file into navigator.The eigen analysis could be conducted almost directly. However,the first vibration period is extremely bigger than that in SAP2000. I am trying to find out the reason. There are two points of view in my mind.

First,it seems there’s a necessity for us to sum up an instruction for the output selection for s2k file.By now,from my experience,only the elastic model without no prismatic or design sections, link elements and bridge data or designs information could be imported from SAP2000 into navigation successfully via s2k file.

Second,Navigator always calculates the mass density in line for the elements.Maybe there will be a problem in eigen analysis for lumped mass and mass density in line coexists.
Perhaps the above is a misunderstanding.If revising nonprismatic section into prismatic one,or something else in s2k file,the mass will be computed additionally,which will make the undesirable results in eigen analysis.

[kengawk]

Today I found that navigator could recognize the link element with zero length as the zero length element.

[kengawk]

The above may not be the case. I failed to find the node number and element number to define the zerolength element in the s2k file. And when I import that s2k file into SAP2000, there is no two joints sharing the same coordinates. The mode shapes from SAP2000 are almost same as those from OSN,and the first period is 0.14 lower than OSN. Could you tell how the zero length element is defined via s2k file?

• This reply was modified 7 years, 10 months ago by kengawk.

[kengawk]

And today I helped a member of our group to build a bridge model with navigator. it seems that the import would be fullfilled even if the link element and nonprismatic section could exist without being used in model.However When I cancel the definition of link element and nonprismatic section.the import is failed with the following message:
Index exceeds matrix dimensions.
Error in PlotModel (line 103)
Error in LoadModel (line 161)
Error in LoadModel (line 81)
Error while evaluating PushTool ClickCallback

[kengawk]

The problem above is caused by link element mainly in my opinion. Maybe the only solution is to change them into beam elements. And I found OSN v2.5.5 could only recoginize the link element name and import s2k file smoothly for SAP2000v16,but could find related definition and failed to write them into tcl files,which is not the case for v14.2.it seems that OSN cannot recognize the link elements name in s2k file for v14.2.

[Andreas Schellenberg]

If you send me an example s2k file where you are having problems with importing link elements I can have a look to see if I can fix it or add that capability. What type of link element are you using? OSN can currently only import certain types of link elements.

[kengawk]

Thank you,Dr. Schellenberg.

Before send the model to you,I will clean free nodes and losing section in s2k file first,and make sure that’s the problem of importing link elements.

Thanks again!

Ken

[kengawk]

The link element can not be imported into OSN except the name of them. If the definition is missing,the s2k file cannot be imported.That is the reason that I believe at the beginning that OSN cannot recognize them and the import aborts.

The nonprismatic section cannot be imported,which makes the import failed.
So I calculate the mean sections to take the place of nonprismatic sections and lumped mass at joints,revising the material mass density with zero for OSN calculate linear mass density for element definition. I don’t think OSN could calculate the volume or mass of the nonprism element.

Now，the mode periods and shapes from OSN are almost the same as those from SAP2000.

Now I wonder if I could get the parameters about mode shape participation.How can I check the mode shape from different model,for example,the same model from the OSN and SAP2000.

Thanks for your help,Andreas! Your advice gived me great inspirations and pushes.I really appreciate it!

Cheers
Ken

• This reply was modified 7 years, 9 months ago by kengawk.

[kengawk]

The link element can not be imported into OSN except the name of them. If the definition is missing,the s2k file cannot be imported.That is the reason that I believe at the beginning that OSN cannot recognize them and the import aborts.

The nonprismatic section cannot be imported,which makes the import failed.
So I calculate the mean sections to take the place of nonprismatic sections and lumped mass at joints,revising the material mass density with zero， for OSN could calculate linear mass density for element definition from s2k file. I don’t think OSN could calculate the volume or mass of the nonprism element.

Now，the mode periods and shapes from OSN are almost the same as those from SAP2000.

Now I wonder if I could get the parameters about mode shape participation.How can I check the mode shape from different model？

Thanks for your help,Andreas! Your advice gave me great inspirations and pushes .I really appreciate it!

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