Search found 15 matches

by kgkoktsi
Wed Apr 17, 2013 3:32 am
Forum: OpenSees.exe Users
Topic: mass participation in modal analysis
Replies: 3
Views: 982

Re: mass participation in modal analysis

Thank you vesna!
Is there any script available so as to give me any idea of the procedure you are talking about?
Once again, thank you!
by kgkoktsi
Fri Apr 12, 2013 2:16 am
Forum: OpenSees.exe Users
Topic: mass participation in modal analysis
Replies: 3
Views: 982

mass participation in modal analysis

Dear all,
does anybody know if I can get an output file with the mass that is activated in each mode in a modal analysis?
Thanks in advance!
by kgkoktsi
Tue Apr 09, 2013 7:28 am
Forum: OpenSees.exe Users
Topic: corrotational truss
Replies: 2
Views: 828

corrotational truss

Can anybody explain to me what exactly the "corrotational truss" is?
What are the degrees of freedom that this element has?

Thanks!
by kgkoktsi
Tue Apr 09, 2013 7:25 am
Forum: OpenSees.exe Users
Topic: rotational springs
Replies: 1
Views: 576

rotational springs

Does anybody know how I can model rotational springs to the base of a structure?

Thanks a lot!
by kgkoktsi
Thu Oct 25, 2012 6:43 am
Forum: OpenSees.exe Users
Topic: pattern plain
Replies: 3
Views: 1182

Re: pattern plain

Vesna, thank you for your quick response. Now, I'm dealing with another problem. I want to perform a dynamic, time history analysis by considering the gravity load. The gravity load is imposed as nodal load with the pattern Plain Linear. Firstly, I run the gravity analysis. Then, I write on the scri...
by kgkoktsi
Thu Oct 18, 2012 4:41 am
Forum: OpenSees.exe Users
Topic: pattern plain
Replies: 3
Views: 1182

pattern plain

Dear all, I have modeled a soil-structure-interaction system and the soil is modeled with quad elements. The applied load is a time series with the following command: pattern Plain $patternTag $tsTag { load $nodetag } where the $nodetag is a node at the bottom of the soil profile. The command "equal...
by kgkoktsi
Thu Sep 27, 2012 1:37 am
Forum: OpenSees.exe Users
Topic: ssi-boundary conditions
Replies: 0
Views: 515

ssi-boundary conditions

Dear all, I'm trying to simulate a soil-structure iteration system (ssi) but I have some questions concerning the boundary conditions of that problem. I simulated the soil system as it is proposed in the site of opensees with the use of the quadrilateral elements and the dashpots. "http://opensees.b...
by kgkoktsi
Tue Sep 25, 2012 3:37 pm
Forum: Soil Modelling
Topic: SSI-boundary conditiions
Replies: 0
Views: 2503

SSI-boundary conditiions

Dear all, I'm trying to simulate a soil-structure iteration system (ssi) but I have some questions concerning the boundary conditions of that problem. I simulated the soil system as it is proposed in the site of opensees with the use of the quadrilateral elements and the dashpots. "http://opensees.b...
by kgkoktsi
Thu Aug 30, 2012 5:47 am
Forum: OpenSees.exe Users
Topic: nDMaterial Drucker Prager
Replies: 2
Views: 1196

nDMaterial Drucker Prager

Hi everybody! In the command manual of Opensees-http://opensees.berkeley.edu/wiki/index.php/Drucker_Prager- the example of a brick element with the nDMaterial Drucker Prager gives the following note: "the element is loaded until failure, at which point the model can no longer converge, as this is a ...
by kgkoktsi
Fri Aug 24, 2012 3:32 am
Forum: OpenSees.exe Users
Topic: time history analysis
Replies: 0
Views: 624

time history analysis

Hello everybody! I'm dealing with a problem concerning timehistory analysis. I have used the SSPbrick element, the ElasticIsotropic3D nDMaterial, and the analysis parameters as follows: constraints Transformation test NormDispIncr 1e-3 15 1 algorithm Newton numberer RCM system ProfileSPD integrator ...
by kgkoktsi
Mon Aug 06, 2012 2:30 pm
Forum: OpenSees.exe Users
Topic: Problem in recognizing the brick8N
Replies: 2
Views: 907

Re: Problem in recognizing the brick8N

Vesna, thank you very much!
by kgkoktsi
Mon Aug 06, 2012 12:15 pm
Forum: OpenSees.exe Users
Topic: Problem in recognizing the brick8N
Replies: 2
Views: 907

Problem in recognizing the brick8N

Hi! I'd be grateful if anybody knows how the brick8N can be read by the opensees. When I write the following script: wipe; model BasicBuilder -ndm 3 -ndf 3; # nodal coordinates: node 1 1 1 4 node 2 -1 1 4 node 3 -1 -1 4 node 4 1 -1 4 node 5 1 1 2 node 6 -1 1 2 node 7 -1 -1 2 node 8 1 -1 2 node 9 1 1...
by kgkoktsi
Sun Aug 05, 2012 2:12 am
Forum: OpenSees.exe Users
Topic: Brick Elements
Replies: 19
Views: 5313

Brick Elements

Hi! I have simulated a structure with brick8N elements by using a model BasicBuilder -ndm 3 -ndf 3. But, when I try to run the script, it posts a warning message: "WARNING NDM=3 and NDF=3 is incompatible with available frame elements". Just to notice that the only type of elements I have used is the...
by kgkoktsi
Fri Jul 27, 2012 7:47 am
Forum: OpenSees.exe Users
Topic: Brick elements-mass and loads
Replies: 1
Views: 670

Brick elements-mass and loads

I have a structure consisted of brick8N elements and I'm dealing with some problems... 1)Since I have defined the mass density (mass/volume) during the definition of the brick8N element, is it sufficient for the dynamic analysis? 2)Can I apply the gravity loads to these brick8N elements using the co...
by kgkoktsi
Sun Jul 22, 2012 7:46 am
Forum: OpenSees.exe Users
Topic: Nonlinear analysis in unreinforced masonry structure
Replies: 1
Views: 1190

Nonlinear analysis in unreinforced masonry structure

How can I simulate the nonlinear behavior of an unreinforced masonry structure in a model of shell elements? Is it adequate if I use the nDMaterial Drucker-Prager or should I use another material in order to take into account the constitutional law? Is the "template Elasto-Plastic" material more pro...