Search found 913 matches

by selimgunay
Fri Sep 24, 2021 9:33 am
Forum: OpenSees.exe Users
Topic: modeling of a spring and a damper in parllel
Replies: 5
Views: 4794

Re: modeling of a spring and a damper in parllel

You can activate Rayleigh damping in the zerolength element with the doRayleigh option and use the region command to assign the dashpot constant.

https://opensees.berkeley.edu/wiki/inde ... th_Element
https://opensees.berkeley.edu/wiki/inde ... on_Command
by selimgunay
Sat Aug 21, 2021 1:25 pm
Forum: OpenSees.exe Users
Topic: elastomericBearingPlasticity
Replies: 2
Views: 1797

Re: elastomericBearingPlasticity

There should not be a specific problem of using any element together with the rigiddiaphragm command. To explore further, you can develop a SDOF system in OpenSees and ETABS with the same mass and using Elastomeric Bearing element in OpenSees and the corresponding element in ETABS
by selimgunay
Tue Aug 17, 2021 8:53 am
Forum: OpenSees.exe Users
Topic: Cable Lifting Analysis
Replies: 4
Views: 2602

Re: Cable Lifting Analysis

Could you also post your question on the OpenSeespy forum? You may get more feedback there.
by selimgunay
Tue Aug 17, 2021 8:40 am
Forum: OpenSees.exe Users
Topic: Does dynamic analysis need to add cell density?
Replies: 1
Views: 1541

Re: Does dynamic analysis need to add cell density?

You can either add mass/length along the element to use a consistent mass matrix or mass at the nodes to use a diagonal mass matrix
by selimgunay
Mon Aug 09, 2021 5:37 pm
Forum: OpenSees.exe Users
Topic: Issues on the Stiffness Matrix Extraction & Output
Replies: 9
Views: 6802

Re: Issues on the Stiffness Matrix Extraction & Output

That sounds great. Did you code the new functions in the source code? If so, you can approach Frank McKenna and Michael Scott for potential implementation of your functions in the standard OpenSees version
by selimgunay
Mon Aug 09, 2021 5:35 pm
Forum: OpenSees.exe Users
Topic: constrain problem
Replies: 2
Views: 1985

Re: constrain problem

Is this a 2D or 3D frame. If it is 2D, because the axial stiffness of the beams is generally large enough, it is a bit questionable why your period changes from 0.48 sec to 0.37 sec when you include an "equaldof" command. If it is a 2D frame you don't need the equaldof command to start with.
by selimgunay
Mon Aug 09, 2021 5:30 pm
Forum: OpenSees.exe Users
Topic: mass moment of inertia
Replies: 6
Views: 4137

Re: mass moment of inertia

You should use a RigidDiaphragm constraint in OpenSees and assign the masses and mass moment of inertia to the center of mass.
by selimgunay
Sun Jul 25, 2021 6:23 pm
Forum: OpenSees.exe Users
Topic: Placing Multiple Recorders into Single File
Replies: 2
Views: 2641

Re: Placing Multiple Recorders into Single File

In your OpenSees file, you can add commands to read from the recorder file and append that information to another file in the for loop
by selimgunay
Tue Jul 20, 2021 9:15 am
Forum: OpenSees.exe Users
Topic: Modelling of columns subjected to large axial force
Replies: 2
Views: 2727

Re: Modelling of columns subjected to large axial force

How are you modeling the braces and beams? If you have them elastic, that may be the reason of large axial forces.
by selimgunay
Mon Jul 19, 2021 10:08 pm
Forum: OpenSees.exe Users
Topic: How to release moment at the ends of a rigid link?
Replies: 7
Views: 3930

Re: How to release moment at the ends of a rigid link?

You can replace one of the equalDOF with a zerolength element that has quite large stiffness except the rotational DOF.
by selimgunay
Mon Jul 19, 2021 9:20 pm
Forum: OpenSees.exe Users
Topic: Time History Analysis on 3D RC Frame: Convergence problem at only one column
Replies: 3
Views: 2302

Re: Time History Analysis on 3D RC Frame: Convergence problem at only one column

You can try reducing the number of fibers, especially in the cover.
by selimgunay
Mon Jul 19, 2021 9:15 pm
Forum: OpenSees.exe Users
Topic: Issues on the Stiffness Matrix Extraction & Output
Replies: 9
Views: 6802

Re: Issues on the Stiffness Matrix Extraction & Output

You can also use the printA command for the structure stiffness matrix.

https://opensees.berkeley.edu/wiki/inde ... tA_Command
by selimgunay
Mon Jul 05, 2021 4:28 pm
Forum: OpenSees.exe Users
Topic: How to release moment at the ends of a rigid link?
Replies: 7
Views: 3930

Re: How to release moment at the ends of a rigid link?

Are you sure that it is not an unstable system when you have hinges at the member ends?