Search found 913 matches
- Thu Sep 30, 2021 9:24 am
- Forum: OpenSees.exe Users
- Topic: Is it possible to have two elements with the same element tag?
- Replies: 1
- Views: 1898
Re: Is it possible to have two elements with the same element tag?
Elements with same tags are not allowed.
- Fri Sep 24, 2021 9:33 am
- Forum: OpenSees.exe Users
- Topic: modeling of a spring and a damper in parllel
- Replies: 5
- Views: 4908
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
https://opensees.berkeley.edu/wiki/inde ... th_Element
https://opensees.berkeley.edu/wiki/inde ... on_Command
- Sat Aug 21, 2021 1:25 pm
- Forum: OpenSees.exe Users
- Topic: elastomericBearingPlasticity
- Replies: 2
- Views: 1821
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
- Tue Aug 17, 2021 8:53 am
- Forum: OpenSees.exe Users
- Topic: Cable Lifting Analysis
- Replies: 4
- Views: 2620
Re: Cable Lifting Analysis
Could you also post your question on the OpenSeespy forum? You may get more feedback there.
- Tue Aug 17, 2021 8:40 am
- Forum: OpenSees.exe Users
- Topic: Does dynamic analysis need to add cell density?
- Replies: 1
- Views: 1551
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
- Mon Aug 09, 2021 5:37 pm
- Forum: OpenSees.exe Users
- Topic: Issues on the Stiffness Matrix Extraction & Output
- Replies: 9
- Views: 7078
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
- Mon Aug 09, 2021 5:35 pm
- Forum: OpenSees.exe Users
- Topic: constrain problem
- Replies: 2
- Views: 2002
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.
- Mon Aug 09, 2021 5:31 pm
- Forum: OpenSees.exe Users
- Topic: mass moment of inertia
- Replies: 6
- Views: 4217
Re: mass moment of inertia
Rigid Diaphragm command https://opensees.berkeley.edu/wiki/inde ... gm_command
- Mon Aug 09, 2021 5:30 pm
- Forum: OpenSees.exe Users
- Topic: mass moment of inertia
- Replies: 6
- Views: 4217
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.
- Sun Jul 25, 2021 6:23 pm
- Forum: OpenSees.exe Users
- Topic: Placing Multiple Recorders into Single File
- Replies: 2
- Views: 2839
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
- Tue Jul 20, 2021 9:15 am
- Forum: OpenSees.exe Users
- Topic: Modelling of columns subjected to large axial force
- Replies: 2
- Views: 2888
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.
- 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: 4031
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.
- 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: 2383
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.
- Mon Jul 19, 2021 9:15 pm
- Forum: OpenSees.exe Users
- Topic: Issues on the Stiffness Matrix Extraction & Output
- Replies: 9
- Views: 7078
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
https://opensees.berkeley.edu/wiki/inde ... tA_Command
- 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: 4031
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?