Home Forums NextFEM Designer support forum simple example of p-delta analysis

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  • #3486
    parhyang
    Participant

    hello

    is there any simple example of p-delta analysis using OpenSees as a solver?
    i did several try, but not succeed. in text mode editing are quiet easy to change at geomTransf options

    regards

    #3487
    NextFEM Admin
    Keymaster

    Hello,
    please set, in Analysis options, Static, Non-linear and P-Delta options. Or, for other types of analyses, check “second-order” option.

    #3489
    parhyang
    Participant

    seems work only using Oofem solver, but not for Opensees. it will cumbersome with editing manually inside text editor. would it be much better supports? thank for interest

    #3661
    NextFEM Admin
    Keymaster

    PDelta in opensees is managed by PDelta transformation, you should find this line in the TCL file.

    #3664
    parhyang
    Participant

    Attached a simple example I questioning, running these problem using built-in OOFEM solver working fine. However, it’s not works for OpenSees as solver when I switch in option menus.

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    #3666
    NextFEM Admin
    Keymaster

    Yes we confirm this, thanks for reporting us. This will be corrected in the next minor update.

    #3672
    NextFEM Admin
    Keymaster

    Solved in v1.7p1, now available.

    #3675
    parhyang
    Participant

    Updating to above versions are working now for OpenSees, however the results are too far. OOFEM solver has shown a consistent and correct answer, not in case using OpenSees solver. Try to understand the problem, I re-create the model then replicates, add loads manually and running. It shown my second duplicated models with manually define load combination are correct, not in case defining these combination trough menus.

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    #3682
    NextFEM Admin
    Keymaster

    Yes, it seems that you left the loadcases in the model set for LC1 also for non-linear cases. In Analysis settings, click on LC1, remove PDelta effects check and delete all the case you find in TH loadcases. Then re-enable Pdelta effects and store the changes.
    There’ll automatic controls in future, thanks for reporting us.

    #3684
    parhyang
    Participant

    I follow as suggested above and it’s working properly now, automatic control for these task are good ideas to avoid something missed at important procedures. I can understand how it’s hard and difficult to implementation the compatibility of both solver (OOFEM & OpenSees). Many thanks for any effort, hopes NextFEM will growing better and be the best interface to bridging the gaps for these famous advanced solver.

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