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I tried changing the system command. I tried each of the available systems. They all gave me the same message except: ProfileSPD gave a run time error UmfPack gave a opensees error that said the LValue was too small. I think that my system is not suited for this system. I have no idea what to do nex...

When I run the eigen analysis first the same error message occurs. It says

OpenSees.exe has encountered a problem and needs to close. We are sorry for the inconvenience.

Hi,

I sent Frank my model of a 20 story building that was closing out opensees while run gravity analysis. I think that it is a memory problem but I don't know what to do. Can someone please help.

Joe

Dear Frank, I have a large model of a nine story building with a mesh of shell elements describing the floors of the building. The problem occurs when I attempt to run and eigen analysis the program shuts down and a Runtime error message is displayed. "Program: C:\tcleditor\bin\OpenSees.exe Thi...

I think that for some reason the shell elements are condensing out the I-Theta term of the mass matrix thus eliminating all of the torsional modes of the building. Is there an element like a shell element that I could use that would not do this?

Thank you

Hello, I am modeling a three story building in three dimensions and am looking for the floor response due to triaxial excitation. I have a bare frame model that uses frame elements and floor described with a rigidDiaphragm command. I also have a model that explicitly models the floor diaphragm with ...

Hello basir, I too am modeling the SAC building except I am modeling the entire building in 3-D. I also am having difficulty matching the period with my SAP models, however your period match significantly better than mine in the elastic case. I was wondering if you were modeling any pin ended beam c...

Thank you, That's what I have done. I think the constraints handler may be an issue. I understand that the Penalty and Lagrange methods are not the best for transient analysis. Thus that leaves the transformation method, however if I want to assign rigid diaphragms at the floor level I then have con...

This is part of a 3-story building with 6 bays in one plan direction and 4 bays in the other plan direction. The moment frames are on the exterior frames in each direction but the interior frame have simple beam column connections. When you say remove the rotational degree of freedom do you mean wit...

I am trying to model an interior column of a multiple story building in a 3D model. There are four beams connected to column at each floor level, all of which are pinned. I have defined 5 nodes at this location and connected them with the equalDOF command. The master node is defined as node1 and fou...

Thank you,

I appreciate the quick response.

Thank you,

I will look into it.

There is not a command at the element level to apply this release? or some way to input the stiffness (i.e. 4-4-2 for rigid or 3-0-0 for pin-pin)?

Hello Anyone,

I am trying to develop 3-D models of the original LA SAC Buildings (3- 9- 20-). I am having difficulty matching the periods of vibration to SAP Models. Has anyone modeled these buildings in the past and had similar problems.

Thanks

jwieser

Hello Anyone,

I am new to OpenSees and am having difficulty modeling beams with end releases (simple "pin" connections). If anyone could let me know how this is done simply I would appreciate it.

Thank you

jwieser