Search found 5866 matches

by fmk
Wed May 23, 2018 2:10 am
Forum: OpenSees.exe Users
Topic: Error in applying initial velocity to a SDOF
Replies: 1
Views: 349

Re: Error in applying initial velocity to a SDOF

you have 0 unknown dof when you use the transformation method .. you might try the Penalty method
by fmk
Fri May 11, 2018 9:32 am
Forum: OpenSees.exe Users
Topic: dashpot connect with nonlinear spring in series
Replies: 3
Views: 573

Re: dashpot connect with nonlinear spring in series

if you are getting results, then you can .. whether the results are correct or not is something else .. looking at the code in the Maxwell model, i would doubt it .. this of course assumes young Prof. Dimitrios Lignos got it correct .. perhaps you should send him an email. He is now is Switzerland. ...
by fmk
Fri May 11, 2018 9:19 am
Forum: OpenSees.exe Users
Topic: Problem with using DataBase commands in OpenSees
Replies: 2
Views: 735

Re: Problem with using DataBase commands in OpenSees

the material you are using: Concrete07 was not added to the ObjectBroker code, i have added the code. if you can build the beast that is OpenSees you can start using the code know.
by fmk
Fri May 11, 2018 9:12 am
Forum: OpenSees.exe Users
Topic: WARNING -- PathSeries::getDuration<> on empty Vector
Replies: 3
Views: 1070

Re: WARNING -- PathSeries::getDuration<> on empty Vector

simple script for you to play with: model Basic -ndm 2 set accel " Path 1 -dt 0.01 -filePath a.dat" pattern UniformExcitation 1 1 -accel $accel you should play with to sort out your problem, e.g. if a.dat does not exist or is an empty file: OpenSees tmp.tcl OpenSees -- Open System For Earthquake Eng...
by fmk
Fri May 11, 2018 9:02 am
Forum: OpenSees.exe Users
Topic: Get fiber stress-strain at specific cross-section (IP)
Replies: 1
Views: 397

Re: Get fiber stress-strain at specific cross-section (IP)

the only options are to figure out the integration weights (you might trying using the default ones and addinng other ones at points wanted with a 0 weight .. check if it works by doing it and comparing results .. they should not change) .. other option is to use disp based elements and put nodes at...
by fmk
Fri May 11, 2018 8:59 am
Forum: OpenSees.exe Users
Topic: ShellDKGT
Replies: 10
Views: 2145

Re: ShellDKGT

not seeing the error:

fgrep ShellDKGQ ShellDKGT.*
ShellDKGT.cpp: s << "EL_ShellDKGQ\t" << eleTag << "\t";

can you post a 4 node example that just creates 4 nodes, 1 material and 1 element
by fmk
Fri May 11, 2018 8:51 am
Forum: OpenSees.exe Users
Topic: Applied displacement
Replies: 8
Views: 929

Re: Applied displacement

the trick was only needed if there were no accelerations at the base. as you are using the Penalty method, the base nodes appear in the equations and Newmark is solving for them and updating accelarations at the node. Sometimes people when using Penalty, also keep the fixity in the dof which results...
by fmk
Thu May 03, 2018 6:08 pm
Forum: OpenSees.exe Users
Topic: Applied displacement
Replies: 8
Views: 929

Re: Applied displacement

the accel should be 0 (unless you used Penalty) .. you should be able to set the accel by including the -accel acelSeriesTag to the time groundMotion (possibly an undocumented feature) .. if you used Penalty tou could check the results for the accel by creating a Matlab script and using the relation...
by fmk
Thu May 03, 2018 6:02 pm
Forum: OpenSees.exe Users
Topic: Why does not the period change even though shear is included
Replies: 6
Views: 1456

Re: Why does not the period change even though shear is incl

you cannot use with disp beam element, your only choice is to switch to forcebeam element .. or put element in parallel with a force beam element with negligably small elastic section (can't be too small as has to invert it) and the shear aggregator you are using.
by fmk
Wed May 02, 2018 8:39 pm
Forum: Parallel Processing
Topic: Error using OpenSeesSP
Replies: 6
Views: 3666

Re: Error using OpenSeesSP

thanks .. probably LayeredShellSection is not working in parallel.

can you post the section and materials commands
by fmk
Wed May 02, 2018 8:36 pm
Forum: OpenSees.exe Users
Topic: How to check if the analyze is completed?
Replies: 3
Views: 792

Re: How to check if the analyze is completed?

set ok [analyze 1]
puts $ok

will output 0 if it worked, other number if did not.
by fmk
Wed May 02, 2018 8:33 pm
Forum: OpenSees.exe Users
Topic: Applying an earthquake acceleration to model
Replies: 6
Views: 1721

Re: Applying an earthquake acceleration to model

when you used uniform acceleration it does not apply any acceleration to the base nodes .. what it does is create a forcing function F(t) = -ag(t) M 1, M being the mass matrix and ag being the ground motion and 1 a vector of 1's and 0's, 1 in the vector if the corresponding dof is in the dirn specif...
by fmk
Wed May 02, 2018 8:28 pm
Forum: OpenSees.exe Users
Topic: Applied displacement
Replies: 8
Views: 929

Re: Applied displacement

are you basically saying that the acceleration recorded at the ground node is not the same as that you used to derive the displacements?
by fmk
Wed May 02, 2018 8:21 pm
Forum: OpenSees.exe Users
Topic: Region
Replies: 2
Views: 325

Re: Region

you can build up the element or nodes into a list and then put an eval around the command

set cmd region -ele $eleList ....
eval $cmd