Search found 14 matches

by aminrahmaani
Fri Nov 04, 2011 10:29 am
Forum: Parallel Processing
Topic: Parallel version 2.3.1
Replies: 8
Views: 5446

Re: Parallel version 2.3.1

Hello all,

I have the same problem with downloading. Can anybody help me?

Thanks in advance!
by aminrahmaani
Mon Jul 18, 2011 12:33 pm
Forum: OpenSees.exe Users
Topic: Problem with the pattern "MultipleSupport"
Replies: 7
Views: 1450

Re: Problem with the pattern "MultipleSupport"

Yes, I know that. That file contains displacements. That's not my problem. Can you see any other problem with my code?
by aminrahmaani
Mon Jul 18, 2011 11:25 am
Forum: OpenSees.exe Users
Topic: Problem with the pattern "MultipleSupport"
Replies: 7
Views: 1450

Re: Problem with the pattern "MultipleSupport"

For sure! The acceleration time history that I'm using is sinusoidal with amplitude of 0.2g and period of 0.5 sec. # Units: m, sec, ton, kN wipe all model basic -ndm 3 -ndf 6 node 1 0 0 0 node 2 0 0 1 node 3 0 0 2 node 4 0 0 3 node 5 0 0 4.4 fix 1 0 1 1 1 1 1 geomTransf Linear 101 1 0 0 set D 0.5 se...
by aminrahmaani
Mon Jul 18, 2011 11:07 am
Forum: Soil Modelling
Topic: Plain GroundMotion command
Replies: 5
Views: 2065

Re: Plain GroundMotion command

So how can I avoid adding those modes?
by aminrahmaani
Mon Jul 18, 2011 11:04 am
Forum: OpenSees.exe Users
Topic: Problem with the pattern "MultipleSupport"
Replies: 7
Views: 1450

Re: Problem with the pattern "MultipleSupport"

What I do is that, I have sinusoidal acceleration time history; then I use SeismoSignal software to convert it to displacement.
by aminrahmaani
Sat Jul 16, 2011 12:49 am
Forum: OpenSees.exe Users
Topic: Problem with the pattern "MultipleSupport"
Replies: 7
Views: 1450

Problem with the pattern "MultipleSupport"

Hi all, I modeled a cantilever with a lumped mass on its top (very simple model). I want to excite the column at the base by using pattern "MultipleSupport" instead of pattern "UniformExcitation". Using "MultipleSupport", I get unreasonable acceleration at the top of the column( e.g a=170 m/s^2); ho...
by aminrahmaani
Wed Jul 13, 2011 11:09 am
Forum: Soil Modelling
Topic: Plain GroundMotion command
Replies: 5
Views: 2065

Re: Plain GroundMotion command

fmk, I modeled a soil column including three elements. I used multi-support excitation command to excite the model at the base of the soil column. The base of the model were fixed in all direction except in the direction of excitation. Here is the BC at the base: fix 1 0 1 1 fix 5 0 1 1 fix 9 0 1 1 ...
by aminrahmaani
Fri Jun 17, 2011 8:34 pm
Forum: Soil Modelling
Topic: Newmark integrator
Replies: 2
Views: 1574

Newmark integrator

Hi, The results of my numerical model are significantly affected by the value of Newmark Integrator parameters. I looked at some examples, and I noticed that different values are being used by different people e.g. 0.5, 0.65, 1.6 and ... I'm wondering whether I can use the value of let's say 3.0 or ...
by aminrahmaani
Fri Jun 17, 2011 1:29 pm
Forum: Soil Modelling
Topic: Plain GroundMotion command
Replies: 5
Views: 2065

Plain GroundMotion command

Dear fmk, Would you explain more the following "Note", mentioned in description of Plain GroundMotion command (OpenseesWiki): "For earthquake excitations it is important that the user provide the displacement time history, as the one generated using the trapezoidal method will not provide good resul...
by aminrahmaani
Fri Jun 17, 2011 1:20 pm
Forum: Soil Modelling
Topic: Brick8N Element
Replies: 2
Views: 1469

Re: Brick8N Element

I want to use the material properties developed by Prof. Jeremic (i.e. Dafalias and Manzari, 2004) Constitutive model.
by aminrahmaani
Thu Jun 16, 2011 5:43 pm
Forum: Soil Modelling
Topic: Brick8N Element
Replies: 2
Views: 1469

Brick8N Element

Hi all,

Has anybody used Brick8N element, developed by Prof. Boris Jeremic? Using this type of element with different sizes in a mesh results in some wrong results, but interestingly using equal size of these elements in a mesh leads to the correct results. Do yo have any idea?

Thanks in advance.
by aminrahmaani
Sat Apr 09, 2011 1:07 pm
Forum: OpenSees.exe Users
Topic: UniformExcitation Pattern
Replies: 1
Views: 959

UniformExcitation Pattern

Hi, I have a question on "UniformExcitation Pattern". I found somewhere that: " UniformExcitation Pattern -- this type of pattern imposes a user-defined acceleration record to all fixed nodes, in a specified direction." This means that if I want to excite a model in x direction, using this command: ...
by aminrahmaani
Fri Apr 08, 2011 9:28 am
Forum: Soil Modelling
Topic: Analyzing large number of 3D elements
Replies: 1
Views: 1030

Analyzing large number of 3D elements

Hi all, I'm modeling soil media by using Brick8N 3D elements. Increasing the number of elements (say 4000 elements), I got this error: "" BandGenLinSOE : ran out of memory for A <size, super,sub><123408, 3686, 3686> "" My question is : Is there any limit for the number of elements and nodes in OpenS...
by aminrahmaani
Wed Feb 02, 2011 11:31 pm
Forum: OpenSees.exe Users
Topic: OpenSees Manual
Replies: 1
Views: 831

OpenSees Manual

Hi to all,

Is there any new manual of the recent versions of OpenSees (I have the manual of OpenSees version 1.7.0)??? That would help use the new commands, especially the ones related to soil modeling!!!