Search found 84 matches

by Gholamreza
Sat Oct 31, 2020 6:18 am
Forum: OpenSees.exe Users
Topic: Assign BWBN material to ZeroLength element ?
Replies: 1
Views: 677

Assign BWBN material to ZeroLength element ?

Hello Engineers, I was wondering to know if I can assign BWBN material to ZeroLength element? In general, How can I make sure if I could assign a specific material to a specific element? For example, I know that Viscous Material can only be assigned to truss and zeroLength elements. and now I wanted...
by Gholamreza
Sat Sep 19, 2020 10:44 am
Forum: OpenSees.exe Users
Topic: Damping cause divergence
Replies: 5
Views: 4191

Re: Damping cause divergence

I use the frequency of the first two modes (w1 and w2). I am not sure about the differences between current, initial, and committed stiffness. I assume these are related to opensees source codes and integration steps. let say damping matrix [C]=a[M]+b[K]. I use the frequency of the first two modes (...
by Gholamreza
Sat Sep 19, 2020 7:55 am
Forum: OpenSees.exe Users
Topic: Damping cause divergence
Replies: 5
Views: 4191

Damping cause divergence

Hello engineers, I have a 20 story SAC building modeled in Opensees. My dynamic analysis is just fine but as soon as I add 2% rayleigh damping I get the following error : WARNING: CTestNormDispIncr::test() - failed to converge after: 100 iterations current Norm: 2.31217e-09 (max: 1e-09, Norm deltaR:...
by Gholamreza
Mon Aug 31, 2020 12:37 pm
Forum: OpenSees.exe Users
Topic: Base Moment
Replies: 5
Views: 966

Re: Base Moment

I am doing time history. So, then I should use element recorders (globalForce) to record the forces (axial forces, Fy) in elements (columns) connected to boundary conditions (supports) at base and also get the base moment (Mz) in those elemnets and take the moment about a point ! OR I can use the no...
by Gholamreza
Mon Aug 31, 2020 11:52 am
Forum: OpenSees.exe Users
Topic: Base Moment
Replies: 5
Views: 966

Re: Base Moment

Can you give me a hint ?
by Gholamreza
Mon Aug 31, 2020 6:20 am
Forum: OpenSees.exe Users
Topic: Base Moment
Replies: 5
Views: 966

Base Moment

Hello Engineers,

I was wondering if there is a recorder to get the seismic base moment of structure similar to base shear ? if element recorder does so, please explain or give me the example!!
by Gholamreza
Thu May 28, 2020 11:53 am
Forum: OpenSees.exe Users
Topic: Hinged Frame with Diagonal Bracing
Replies: 6
Views: 6534

Re: Hinged Frame with Diagonal Bracing

informative
by Gholamreza
Mon Jul 08, 2019 1:23 pm
Forum: OpenSees.exe Users
Topic: Relative acceleration to lower story
Replies: 0
Views: 526

Relative acceleration to lower story

Hello engineers,
Is there any node recorder or any way I can record relative acceleration (to the lower story NOT to the ground) in MDOF ?
For example I'd like to record the acceleration of 5th story relative to 4th story ? Something similar to concept of DRIFT.
by Gholamreza
Mon Jul 08, 2019 1:18 pm
Forum: OpenSees.exe Users
Topic: Stiffness Matrix
Replies: 2
Views: 1061

Re: Stiffness Matrix

You can use PrintA command for the elements in mass and stiffness matrices. You need to use appropriate analysis parameters.
by Gholamreza
Tue Jun 11, 2019 6:45 am
Forum: OpenSees.exe Users
Topic: Static pushover analysis
Replies: 2
Views: 696

Re: Static pushover analysis

What is the error ?
by Gholamreza
Fri Dec 14, 2018 6:09 am
Forum: OpenSees.exe Users
Topic: Bouc Wen Material
Replies: 2
Views: 2866

Bouc Wen Material

Hi, I modeled SDOF with nonlinear spring using Bouc Wen model in MATLAB (yielding displacement is 1cm). I'd like to do the same thing in OPENSEES. I tried Bouc-Wen, Steel01 and also Hysteretic material but my result is not as MATLAB. How can I determine the yielding displacement in Bouc-Wen material...
by Gholamreza
Fri Nov 30, 2018 6:31 am
Forum: OpenSees.exe Users
Topic: MASS/Stiffness Matrix Interpretation
Replies: 2
Views: 2505

MASS/Stiffness Matrix Interpretation

Hello engineers, I use Print A command to get Mass or Stiffness matrix for a system (let say SDOF) but I don't know how to interpret that. here is the example: I got this 6x6 stiffness matrix for SDOF: 2.06761e+06 0 17848 -2.05571e+06 0 0 0 1.56867e+14 -3.13734e+14 0 -1.56867e+14 -3.13734e+14 17848 ...
by Gholamreza
Fri Nov 30, 2018 5:53 am
Forum: OpenSees.exe Users
Topic: how to calculate structure's energy
Replies: 21
Views: 16068

Re: how to calculate structure's energy

Informative
by Gholamreza
Wed Oct 31, 2018 1:31 pm
Forum: Framework
Topic: explicit methods for dynamical analysis
Replies: 14
Views: 21970

Re: explicit methods for dynamical analysis

So informative, Thanks
by Gholamreza
Tue Oct 30, 2018 5:57 am
Forum: OpenSees.exe Users
Topic: Explicit Newmark integrator
Replies: 2
Views: 824

Re: Explicit Newmark integrator

I guess the command is as follows: integrator NewmarkExplicit $gamma When I use this command, I 'll get the following error: ........................................................................................................................................................................ WARNIN...