Search found 110 matches

by jwaugh
Mon Aug 31, 2009 3:16 pm
Forum: OpenSees.exe Users
Topic: opensees doesn't run..Help..urgent..
Replies: 10
Views: 5054

I have used it in a 3D model, how else would I have done multi-directional loading, and it worked fine.
by jwaugh
Thu Apr 17, 2008 7:11 am
Forum: OpenSees.exe Users
Topic: What is this opensees error mean??
Replies: 5
Views: 2906

Silvia, what he is doing is right. At least it is right according to how I have used "sp" before.

If you take the same model and change it to Displacement control and cycle it that way then it works.
by jwaugh
Fri Apr 11, 2008 9:22 am
Forum: OpenSees.exe Users
Topic: Release DOFs
Replies: 3
Views: 2191

THanks, I want to make like a hinge, I hadn't thought of the double node.
by jwaugh
Thu Mar 27, 2008 12:59 pm
Forum: OpenSees.exe Users
Topic: Release DOFs
Replies: 3
Views: 2191

Release DOFs

Is it possible to release a specific DOF on an element. Say you want to release the moment at the end of a beam element. How would this be accomplished?

Thanks
by jwaugh
Thu Feb 28, 2008 7:08 pm
Forum: OpenSees.exe Users
Topic: multi-point constraint displacement controlled pushover
Replies: 10
Views: 4430

Silvia,

Does this question show up often enough to add a example of it? I wrote a quick example for mbazan, do you want it?
by jwaugh
Thu Feb 21, 2008 11:44 am
Forum: OpenSees.exe Users
Topic: multi-point constraint displacement controlled pushover
Replies: 10
Views: 4430

Silvia has it. Here how I do it on a regular basis, I needed to apply a displacement history to different DOF on the same node. set SeriesPath1 "Path Series -dt 1 -filePath Y_Displ.txt" set SeriesPath2 "Path Series -dt 1 -filePath Z_Displ.txt" pattern Plain 2 $SeriesPath1 { sp 8 2 1 } pattern Plain ...
by jwaugh
Fri Jan 11, 2008 8:41 am
Forum: OpenSees.exe Users
Topic: OpenSees weirdness with axial load
Replies: 4
Views: 2355

I will give that a try, but that is weird because I have done it that way many times before and never had a problem with it.
by jwaugh
Thu Jan 10, 2008 2:32 pm
Forum: OpenSees.exe Users
Topic: OpenSees weirdness with axial load
Replies: 4
Views: 2355

OpenSees weirdness with axial load

Ok, when I run the following script it executes just fine. model basic -ndm 3 -ndf 6 # Create nodes node 3 0.0 0.0 377.77 node 5 72.0 0.0 377.77 node 7 144.0 0.0 377.77 node 9 216.0 0.0 377.77 node 11 288.0 0.0 377.77 node 13 360.0 0.0 377.77 node 15 432.0 0.0 377.77 node 4 0.0 0.0 -377.77 node 6 72...
by jwaugh
Tue Jul 10, 2007 10:09 am
Forum: OpenSees.exe Users
Topic: section deformation
Replies: 2
Views: 2589

Okay, the tension steel will have some residual strain, use a stress-strain recorder to confirm this. But if you take it back to zero displacement you will see the column has some displacement when it passes through zero force. Plane sections remain plane is in effect through ALL stages of the analy...
by jwaugh
Wed Jun 27, 2007 11:38 am
Forum: OpenSees.exe Users
Topic: New Concrete Model
Replies: 1
Views: 2136

New Concrete Model

I developed a new concrete model for OpenSees based on Chang and Mander's 1994 concrete model. I gave the model out to some people at the NEES Annual Meeting, and it will be in the next release of OpenSees. If you are using this model please post in here or send me a PM with your name and email so I...
by jwaugh
Sun Apr 15, 2007 7:18 pm
Forum: OpenSees.exe Users
Topic: Mode Shape
Replies: 14
Views: 10272

I updated the proc to read like this: proc procGetTperiod {Neigen {PrintScreen "off"}} { set fmt1 "Mode=%.1i: Tperiod=%.3f " set PI [expr 2*asin(1.0)]; # define constants set iTperiod "" set lambdaN [eigen $Neigen] for {set i 1} {$i <= $Neigen} {incr i 1} {; # zero to one set lambda [lindex $lambdaN...
by jwaugh
Sun Apr 15, 2007 5:58 pm
Forum: OpenSees.exe Users
Topic: wall
Replies: 10
Views: 5716

Boris, you are right if the wall's height to length ratio are low you shouldn't use a beam element. However, if you are looking at a system where the main lateral resistance is the wall, then I wouldargue that if the wall is four stories tall then the h/l is probably > 3, then it will be flexure dom...
by jwaugh
Sun Apr 15, 2007 9:47 am
Forum: OpenSees.exe Users
Topic: Mode Shape
Replies: 14
Views: 10272

I have tried editing the script you gave me to find the period so it reads as following: proc procGetTperiod {Neigen {PrintScreen "off"}} { set fmt1 "Mode=%.1i: Tperiod=%.3f " set PI [expr 2*asin(1.0)]; # define constants set iTperiod "" set lambdaN [eigen $Neigen] for {set i 1} {$i <= $Neigen} {inc...
by jwaugh
Fri Apr 13, 2007 1:45 pm
Forum: OpenSees.exe Users
Topic: Mode Shape
Replies: 14
Views: 10272

I still get:

Node::getEigenvectors<> = eigenvectors have not been set.

What is going wrong?
by jwaugh
Fri Apr 13, 2007 8:08 am
Forum: OpenSees.exe Users
Topic: Mode Shape
Replies: 14
Views: 10272

Yes, that is the only DOF with Masses associated with it.