Search found 15 matches

by aaataha
Fri Oct 15, 2021 6:58 pm
Forum: Parallel Processing
Topic: Accuracy of OpenSeesMP results
Replies: 1
Views: 8358

Accuracy of OpenSeesMP results

Hello,

I am using openseesMP for modeling a large soil medium (partitioned) and noticed a difference in the results compared to sequential analysis. What could be the reason for this deviation of openseemMP results?
by aaataha
Sat May 22, 2021 7:48 am
Forum: OpenSees.exe Users
Topic: Soil modelling
Replies: 0
Views: 4217

Soil modelling

hi,

I have a soil model. And I am using MultiYieldSurfaceClay material and quad elements for modeling the soil. However, I get this error when running the analysis:

FATAL:MultiYieldSurfaceClay::Can not deal with e2p

what's that mean?
by aaataha
Fri Jan 15, 2021 2:03 am
Forum: Parallel Processing
Topic: parallel analysis of a nonlinear frame
Replies: 2
Views: 6250

parallel analysis of a nonlinear frame

Hi, I am trying to run a model of a nonlinear frame system with force-based elements using openseesSP. However, the analysis doesn't start at all and i get this error "ForceBeamColumn3d::update() -- could not invert flexibility". Although the analysis of the same model can be done successfully using...
by aaataha
Sat Nov 21, 2020 3:55 am
Forum: OpenSees.exe Users
Topic: analysis warning
Replies: 1
Views: 1963

analysis warning

Hi

I am trying to perform a site response analysis of a 2D soil model. The soil is modeled using quad elements. During the analysis, I get this warning:

WARNING DOF_Group::setID - invalid location 2 in ID of size 2

What does that mean?
by aaataha
Fri Nov 20, 2020 2:33 am
Forum: OpenSees.exe Users
Topic: 2D soil model with plane strain formulation
Replies: 1
Views: 1966

2D soil model with plane strain formulation

Hi,

I am trying to model an elastic isotropic soil medium using plane strain formulation. So, do I need to either use only a quad element with a plane strain type or only a PlaneStrain material to impose the plane strain conditions? or should I use both?

Thanks
by aaataha
Fri Nov 20, 2020 2:04 am
Forum: OpenSees.exe Users
Topic: modeling of an elastic isotropic soil
Replies: 1
Views: 1971

modeling of an elastic isotropic soil

Hi,

I am trying to model an elastic isotropic soil and I am wondering about the appropriate material to be used.
for the ElasticIsotropic material:

nDMaterial ElasticIsotropic $matTag $E $v <$rho>

is the soil shear modulus implicitly defined in terms of E and v?
by aaataha
Sat Oct 24, 2020 6:46 am
Forum: OpenSees.exe Users
Topic: error with defining a node
Replies: 2
Views: 2667

error with defining a node

I defined a node using this command node 08010 6.00 0.00 -1.00 however, i get this error when running the model: WARNING invalid nodeTag Want: node nodeTag? [ndm coordinates?] <-mass [ndf values?]> expected integer but got "08010" while executing "node 08010 6.00 0.00 -1.00" (file "model5dist.tcl" l...
by aaataha
Sat Oct 24, 2020 4:59 am
Forum: OpenSees.exe Users
Topic: modeling of a spring and a damper in parllel
Replies: 5
Views: 4794

modeling of a spring and a damper in parllel

Hi, I am trying to model a spring-damper system in which the spring and the damper are placed in parallel. I couldn't find any material or element that would simulate that behavior. The available ViscousDamper material simulates a spring and a damper put in series, and the Viscous material isn't all...
by aaataha
Fri Aug 28, 2020 8:38 am
Forum: OpenSeesPy
Topic: Convergence problems with force-based elements
Replies: 7
Views: 7349

Re: Convergence problems with force-based elements

Try with Newmark instead of alphaOS. Also, see if you have issues with all elastic materials. I use newmark as the primary integrator. But then I use a convergence approach that incorporates different nonlinear algorithms, integrators, time step sizes and tolerance values. Here it is: # %%% DYNAMIC...
by aaataha
Fri Aug 28, 2020 8:31 am
Forum: OpenSeesPy
Topic: Convergence problems with force-based elements
Replies: 7
Views: 7349

Re: Convergence problems with force-based elements

This forum is generally for OpenSeesPy (Python) specific questions. But, perhaps you can make all your uniaxialMaterials Elastic and see if you have convergence problems. Here are some steps to follow: https://wp.me/pbejzW-1C It's difficult to say what the problem is based on your post. A screen sh...
by aaataha
Fri Aug 28, 2020 8:04 am
Forum: OpenSeesPy
Topic: Convergence problems with force-based elements
Replies: 7
Views: 7349

Convergence problems with force-based elements

Hi, I am modelling a 5-story, 2-bay and 1-bay in the horizontal two directions, RC structure. For performing a nonlinear seismic analysis, I once used a dispbeamcolumn element and then forcebeamcolumn element for modeling both beams and columns. In terms of convergence, the dispbeamcolumn element wa...
by aaataha
Sat Aug 22, 2020 1:00 pm
Forum: OpenSeesPy
Topic: Dynamic analysis under bidirectional earthquake
Replies: 4
Views: 5115

Re: Dynamic analysis under bidirectional earthquake

i figured out the problem. It is because i defined the element recorder like that: recorder Element -file Results/Force11111.out -time -ele 11111 section 1 force But once I deleted the "seciton 1" part, the results are reasonable. But I still don't understand what the results at the section mean?! I...
by aaataha
Sat Aug 22, 2020 12:34 pm
Forum: OpenSeesPy
Topic: Dynamic analysis under bidirectional earthquake
Replies: 4
Views: 5115

Re: Dynamic analysis under bidirectional earthquake

selimgunay wrote:
Sat Aug 22, 2020 12:27 pm
This looks like a simply supported boundary condition. I would recommend checking the boundary conditions for the bottom nodes of your columns.
This is the command I used for the boundary conditions

fixY 0.0 1 1 1 1 1 1
by aaataha
Sat Aug 22, 2020 12:22 pm
Forum: OpenSeesPy
Topic: Dynamic analysis under bidirectional earthquake
Replies: 4
Views: 5115

Dynamic analysis under bidirectional earthquake

Hi, I am carrying out dynamic analysis on a 3D RC structure with fixed supports using a bidirectional earthquake. When I extract the straining actions of the base columns at the base section, i get no moments about the x and y axes. why is that? All frame elements are modeled using the dispBeamColum...
by aaataha
Tue Oct 15, 2019 3:29 pm
Forum: OpenSees.exe Users
Topic: involuntary change of the current directory
Replies: 0
Views: 1708

involuntary change of the current directory

Hi, i am trying to run three files [model.tcl, Gravity.tcl, PushX.tcl] from inside another file using the "source" command: wipe; puts [pwd]; source model.tcl; puts [pwd]; source Gravity.tcl; source PushX.tcl; All files are in the same folder. However, when i try running the script, the current dire...