Search found 38 matches

by martinmasanes
Tue Apr 29, 2014 11:50 am
Forum: OpenSees.exe Users
Topic: Analysis time
Replies: 1
Views: 244

Analysis time

Dear fmk: I'm doing some research (IDA analysis) with a relatively large model with elastic and nonlinear elements. It is a plane frame. I want to know if there is a combination of analysis commands that can help me to save time. For example in the actual model, a time history analysis for a seismic...
by martinmasanes
Mon Apr 28, 2014 6:04 am
Forum: OpenSees.exe Users
Topic: Brace Buckling
Replies: 1
Views: 502

Re: Brace Buckling

In case anyone is doing the same, I found a simple working solution. the Only mputa that you need to know is the length from the beam-columns connection to the middle of the barce, then using the drift command you avoid the Story drift problem and get the deformation (in %) of the node, so you only ...
by martinmasanes
Wed Apr 23, 2014 7:06 am
Forum: OpenSees.exe Users
Topic: Brace Buckling
Replies: 1
Views: 502

Brace Buckling

Dear all: I'm doing some research on braced frames and studing brace buckling, and have a problem trying to capture the displacement of the middle node of the brace. My braces have 10 elements (like Vesna's example) and the main problem is to capture the displacement of the middle node because of 2 ...
by martinmasanes
Fri Apr 04, 2014 6:32 am
Forum: OpenSees.exe Users
Topic: Insufficient arg
Replies: 8
Views: 1717

Re: Insufficient arg

Sorry!! Had not read the limitation that there exists on the N-1 DOF whith the default eigen Solver...problem solved

Thanks
by martinmasanes
Thu Apr 03, 2014 8:12 am
Forum: OpenSees.exe Users
Topic: Insufficient arg
Replies: 8
Views: 1717

Re: Insufficient arg

Sorry I wasn't using the current version, but it was because the model doesn't work on the current version. I get a "domain error: argument not in valid range". The error occurs during the eigen analysis, so i think there is a problem in the version 2.4.3 with the eigen command. My eigen analysis is...
by martinmasanes
Mon Mar 31, 2014 9:48 am
Forum: OpenSees.exe Users
Topic: Insufficient arg
Replies: 8
Views: 1717

Re: Insufficient arg

I'm using version 2.4.2 (rev. 5540). about the command, I'm using what says on the source code. I'm sure this is the offending command because the model works fine, then I add this single command and it doesn't work, and shows the warning about the args.
by martinmasanes
Mon Mar 31, 2014 7:26 am
Forum: OpenSees.exe Users
Topic: about fiber section segmentation
Replies: 4
Views: 606

Re: about fiber section segmentation

IDR should not change with different number of fibers in your sections, only the info you can get for a section analysis
by martinmasanes
Sat Mar 29, 2014 3:43 pm
Forum: OpenSees.exe Users
Topic: Insufficient arg
Replies: 8
Views: 1717

Re: Insufficient arg

Thanks for the reply.
When i used puts"..." y got:

uniaxialMaterial SteelBRB 6 20408.16 37.75 62.29 1.2 1.0 0.3 69.77 0.2 1.05 0.15 1.0e-14

wich I suposse, is correct.
by martinmasanes
Thu Mar 27, 2014 2:21 pm
Forum: OpenSees.exe Users
Topic: Insufficient arg
Replies: 8
Views: 1717

Insufficient arg

Dear fmk I'm trying to use the SteelBRB uniaxial material, but i get the message of insuficient args, and I think I'm setting all the required parameters, what a have on my model is set matID_BRB 6 set Sigmay_0 [expr 370*$MPa]; set Sigmay_T [expr 1.65*$Sigmay_0]; set alpha_T 1.2; set beta_T 1.0; set...
by martinmasanes
Fri Feb 28, 2014 9:12 am
Forum: OpenSees.exe Users
Topic: SteelBRB element
Replies: 6
Views: 3202

Re: SteelBRB element

Thanks!, just passing here and found your answer.
by martinmasanes
Fri Jan 10, 2014 10:54 am
Forum: OpenSees.exe Users
Topic: Story Shear
Replies: 1
Views: 244

Story Shear

Dear All

I'm performing a time history analysis and want to capture the story shear. The model is a braced frame, so the question is which is the best recorder to capture the shear at each story


Thanks!!

Martin Masanes
by martinmasanes
Mon Jan 06, 2014 5:52 pm
Forum: OpenSees.exe Users
Topic: local coordinates
Replies: 5
Views: 444

Re: local coordinates

I know I should know this, but to compute the axial displacement, I shoul consider only the end nodes/elements, or is it necesary to include de inner node/elements displacements? I ask this because the braces buckle, so I have the doubt if the axial displacement (ploted in all the reports about this...
by martinmasanes
Fri Jan 03, 2014 11:18 am
Forum: OpenSees.exe Users
Topic: local coordinates
Replies: 5
Views: 444

Re: local coordinates

The brace is a "chain" of 10 forceBeamColumn elements, like Vesna's example of SCBF.
by martinmasanes
Fri Jan 03, 2014 6:24 am
Forum: OpenSees.exe Users
Topic: local coordinates
Replies: 5
Views: 444

local coordinates

Dear fmk I'm working with an SCBF and I want to measure the axial displacement of a brace, so the recorder I'm using is the node disp recorder, and then get the axial displacement correcting with sin() and cos(). The question is if there exist a recorder so that I can get the axial disp without corr...
by martinmasanes
Sat Dec 28, 2013 6:11 am
Forum: OpenSees.exe Users
Topic: Recorders
Replies: 0
Views: 298

Recorders

Dear All Hello, I have a relatively big model of a 6 story SCBF and used Vesna's example to build it (Using 10 elements per brace, rigid end of beam and columns,...). It is running fine and was able to process every ground motion I've tried on it. But I need your help to know which recorders are the...