Search found 5866 matches

by fmk
Wed May 02, 2018 8:17 pm
Forum: OpenSees.exe Users
Topic: Why does not the period change even though shear is included
Replies: 6
Views: 1409

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

sorry .. shear aggregator does not work with disp based elemnets, only forced based include shear defo effects if provided in the section.
by fmk
Wed May 02, 2018 8:02 pm
Forum: OpenSees.exe Users
Topic: Record flexure and shear displacements components
Replies: 2
Views: 313

Re: Record flexure and shear displacements components

you cannot record that info from the element .. and your approach will not work for a nonlinear model.
by fmk
Wed May 02, 2018 7:47 pm
Forum: OpenSees.exe Users
Topic: Viscous damper with MultipleSupport disp input
Replies: 4
Views: 1270

Re: Viscous damper with MultipleSupport disp input

the viscous material is looking at change in vel of two connected nodes to get a force value .. as you only provide an imposed displacement at the node and no associated vel, the material is going to have a 0 force as there is no delta velocity between the nodes.
by fmk
Thu Apr 26, 2018 5:28 am
Forum: OpenSees.exe Users
Topic: Algorithm Failed at Iteration
Replies: 2
Views: 502

Re: Algorithm Failed at Iteration

if the solver fails it means the tangent matrix is singular, i.e. a 0 encountered on diagonal during factorization, i.e. your model is unstable. .. as it does get through the first few steps you could try swicthcing to a ModifiedNewton with initial stiffness iterations
by fmk
Thu Apr 26, 2018 5:23 am
Forum: OpenSees.exe Users
Topic: ConvergenceTest object failed in test
Replies: 4
Views: 1302

Re: ConvergenceTest object failed in test

the message says that after 100 iterations it failed to reach the convergence that you specify of 1.0e-5 on the norm of the disp increment, at the 100'th step the norm was 14.4 and the norm of the unbalance was 36.9. as it is failing in the very first analysis step .. your model is probably incorrect.
by fmk
Wed Apr 18, 2018 4:04 pm
Forum: OpenSees.exe Users
Topic: Push and Pull
Replies: 9
Views: 1225

Re: Push and Pull

if i do print node Node: 1 Coordinates : 0 Disps: 0 Velocities : 0 unbalanced Load: 0 reaction: 180000 ID : -1 Node: 2 Coordinates : 1 Disps: -6 Velocities : 0 unbalanced Load: -180000 reaction: 0 ID : 0 Node1 ele1 Node2 i.e. 180000 --> []-------------{] <--180000 sure looks o.k. from an equilibrium...
by fmk
Wed Apr 18, 2018 3:55 pm
Forum: OpenSees.exe Users
Topic: Error while building OpenSees source code by Visual Studio
Replies: 5
Views: 711

Re: Error while building OpenSees source code by Visual Stud

no .. it is looking for a lib it cannnot find .. look to see in the opensees project settings where tcl86t.lib is being set and try changing to tcl86.lib or whatever the lib you have is.
by fmk
Wed Apr 18, 2018 3:53 pm
Forum: OpenSees.exe Users
Topic: Develop a material/opensees
Replies: 1
Views: 523

Re: Develop a material/opensees

you could place a link to the dll in the wiki. you need my permission to get wiki page access. it will of course be useless when we update to newer versions.
by fmk
Wed Apr 18, 2018 3:52 pm
Forum: OpenSees.exe Users
Topic: Problem with initial strain material!!!!
Replies: 1
Views: 490

Re: Problem with initial strain material!!!!

post a small example. try not to use variable up the wazoo so i can see what the actual numbers are.
by fmk
Wed Apr 18, 2018 3:48 pm
Forum: OpenSees.exe Users
Topic: loss of output data
Replies: 1
Views: 321

Re: loss of output data

try adding a 'remove recorders' before program exits
by fmk
Mon Apr 16, 2018 9:44 pm
Forum: OpenSees.exe Users
Topic: 2d Dynamic non linear RC fiber model - Period too long!
Replies: 10
Views: 2033

Re: 2d Dynamic non linear RC fiber model - Period too long!

you do not need units at all .. the examples have them because the person who did them firmly believed in them .. if you keep your units constant in a file then drop them. as for rigid offsets .. they may be needed, depends on the column and the connection, if very stiff then modeling the beam going...
by fmk
Mon Apr 16, 2018 9:38 pm
Forum: OpenSees.exe Users
Topic: Error while building OpenSees source code by Visual Studio
Replies: 5
Views: 711

Re: Error while building OpenSees source code by Visual Stud

did you install tcl .. if so probably in wrong place .. find where tcl lib is and then and then edit the project setting to use that file.
by fmk
Sat Apr 14, 2018 7:22 pm
Forum: OpenSees.exe Users
Topic: Interpretation of .out files
Replies: 3
Views: 439

Re: Interpretation of .out files

try -xml instead of -file in the command line .. the xml description of data the preceeds the data in the output may help
by fmk
Sat Apr 14, 2018 7:20 pm
Forum: OpenSees.exe Users
Topic: High Cycle counting
Replies: 1
Views: 328

Re: High Cycle counting

you can modify the fatigue material to do whatever you want.