Search found 23 matches

by Panos
Thu Jul 23, 2015 3:35 pm
Forum: OpenSees.exe Users
Topic: Update material during analysis
Replies: 0
Views: 5748

Update material during analysis

I am interested in applying the confinement of concrete according to CEB Model Code 1990 §3,5,2,1. According to the corresponding figure (Fig 3,5,4), concrete in tension contributes to the confining pressure in addition to confinement provided by the hoops. Consequently, the confining pressure is di...
by Panos
Tue Jan 06, 2015 3:32 pm
Forum: OpenSees.exe Users
Topic: node tag of specific coordinate
Replies: 3
Views: 3200

Re: node tag of specific coordinate

http://opensees.berkeley.edu/wiki/index.php/GetNodeTags
I found this command in the command manual but there's no desciption. Does this mean that the command isn't available or has been removed?
by Panos
Fri Aug 29, 2014 10:11 am
Forum: OpenSees.exe Users
Topic: torsional stiffness
Replies: 4
Views: 5098

Re: torsional stiffness

On account of this topic, I would like to ask the reason for customarily assigning large values of torsional stiffness when modelling 3D buildings (like the example you posted above), instead of the actual stiffness calculated using the equations of engineering mechanics.
by Panos
Fri Jan 17, 2014 9:42 am
Forum: Feature Requests/Future Directions
Topic: New commands
Replies: 3
Views: 14330

Re: New commands

Instead of automatic e-mails to users, you could create a change log page, similar to the log page of the software: http://opensees.berkeley.edu/OpenSees/changeLog.php I think this would be easier to create and more informative, since all changed will be listed together.
by Panos
Tue Dec 17, 2013 10:58 am
Forum: OpenSees.exe Users
Topic: Running OpenSees files from Notepad++
Replies: 10
Views: 11888

Re: Running OpenSees files from Notepad++

Sorry, I found the answer elsewhere and forgot to update the topic. Add the command "pause" in a new line in the end:
echo off
cls
echo Starting OpenSees..
echo off
location_of_OpenSEES\openSees.exe location_of_your_model\yourModel.tcl
pause
by Panos
Tue Dec 10, 2013 10:06 am
Forum: OpenSees.exe Users
Topic: Rigid beams in fiber modeling of RC shear wall (urgent)
Replies: 3
Views: 3382

Re: Rigid beams in fiber modeling of RC shear wall (urgent)

An element is effectively rigid, if the results from analyses with different E (eg. 1000E & 10000E) do not vary significantly. Usually, E=1000*Ec would be enough.
by Panos
Sat Nov 23, 2013 9:23 am
Forum: OpenSees.exe Users
Topic: ElasticTimoshenkoBeam
Replies: 2
Views: 3134

Re: ElasticTimoshenkoBeam

Out of curiosity, is the element documented? I can't find it in the element list in the command manual: http://opensees.berkeley.edu/wiki/index ... nt_Command
by Panos
Mon Sep 16, 2013 4:20 am
Forum: OpenSees.exe Users
Topic: List of nodes assigned to rigid Diaphragm
Replies: 5
Views: 5480

Re: List of nodes assigned to rigid Diaphragm

By the sound of it, the slaveNodeTag argument accepts only variables and cannot discriminate the elements of a given list. The only solution that I can think of right now is to greadually construct the diaphragm, using multiple rigidDiaphragm commands. Put the command within a loop and use the linde...
by Panos
Sun Sep 15, 2013 3:34 pm
Forum: OpenSees.exe Users
Topic: List of nodes assigned to rigid Diaphragm
Replies: 5
Views: 5480

Re: List of nodes assigned to rigid Diaphragm

I am not familiar with the rigidDiaphragm command, but this looks like a tcl-scripting error. If I understand correctly, the programme tries to implement a command defined by string "0 1 2 ....". Since there's no such command, an error is encountered. You can either try to remove the brack...
by Panos
Wed Jul 17, 2013 11:31 am
Forum: OpenSees.exe Users
Topic: existing story forces
Replies: 3
Views: 3242

Re: existing story forces

I think that you mean the total shear force of every column of a storey. I'm not sure if such a recorder is available, but you can you can calculate yourself the total shear force at the post-processing phase (eg. using matlab).
by Panos
Thu Jul 11, 2013 6:57 am
Forum: OpenSees.exe Users
Topic: Why different result from nonlinearBeamColumn and dsipBeamCo
Replies: 1
Views: 2150

Re: Why different result from nonlinearBeamColumn and dsipBe

I suggest that you should study the following presentation concerining the differences between these two elements. http://opensees.berkeley.edu/wiki/index.php/Discovering_OpenSees_--_Force-based_Element_vs._Displacement-based_Element In general, displacement-based elements require a more detailed me...
by Panos
Thu Jul 04, 2013 9:58 am
Forum: OpenSees.exe Users
Topic: Have to use fiber elements to get P-Delta for pushover?
Replies: 1
Views: 2227

Re: Have to use fiber elements to get P-Delta for pushover?

Above all, you 'll have to change the geometric Transformation to PDelta http://opensees.berkeley.edu/wiki/index ... sformation (I'm guessing you're using Linear).
by Panos
Fri Jun 28, 2013 8:51 am
Forum: OpenSees.exe Users
Topic: reading a .txt file in a list format
Replies: 2
Views: 2783

Re: reading a .txt file in a list format

the gets command reads only a line of data every time http://www.tcl.tk/man/tcl8.5/TclCmd/gets.htm
try the read command, or use a loop to read every line
by Panos
Thu Jun 27, 2013 2:05 pm
Forum: OpenSees.exe Users
Topic: Rayleigh Damping
Replies: 3
Views: 3210

Re: Rayleigh Damping

In order to assign damping values to 3 or more vibration modes, you have to use Caughey damping, but I do not know if such an option is available in opensees.
by Panos
Thu Jun 13, 2013 1:12 pm
Forum: OpenSees.exe Users
Topic: confinedconcrete01
Replies: 1
Views: 2583

Re: confinedconcrete01

Have you specified a unique material tag?