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  1. kostast88

    Euler's Beam theory

    Actually no, you don't have such options in SAP2000. Shear deformations will affect flexural behaviour by default, so one could assume it's a "Timoshenko beam" by default the one in SAP.However it's NOT a Timoshenko beam, it's a different kind of theory, which coud be applied in both short and...
  2. kostast88

    unselect automatic design load combinations

    In the concrete/stell design selection (whatever you want) select the view/revise preferences option. This is where you choose the code and the design preferences. To deselect the auto load combinations check the "design load combinations selection" and untick the box "Automatic ...". To...
  3. kostast88

    hide objects

    Right click on your selection ,and click "show selection only" .Then to make hidden objects appear again, right click show all.
  4. kostast88

    Difference between constraints?

    Select the 4 joints in the perimeter of the slab and assign diaphragm.If however you are interested in modelling the slab (because you mentioned one-way) perhaps you should do this in etabs or safe,the other csi software which have additional tools for slabs.
  5. kostast88

    SAP2000 steel joints design

    The easiest way I can think of is to create a datasheet (like Ms Excel) and pass in the design expressions yourself, by exporting the analysis results. Pivot table option in Excel will come handy.
  6. kostast88

    SAP2000 Reorienting support reactions

    If you want to rotate the restraints, right click on the target joint and double click on the local axes property(or select it and assign->joint->local axes). From there define the angle you wish and just press ok.(eg in 2d frame, assign 45 degrees in rotation about Y axi).
  7. kostast88

    Non-Linear Pushover Analysis

    Are you sure this is the right file? -There are no frame hinges in this one (define->section properties->hinge properties...) -One of your materials has a stress-strain curve to behave as tottaly elastic -There is no nonlinear static analysis case but a direct integration one.The accel is the...
  8. kostast88

    Non-Linear Pushover Analysis

    Yes this is how you do it for the lateral load.It is just what I wrote before.Not a "true aceleration". What exactly doesn't make sense in the results you mentioned in the first post? Because I believe there is some confusion of static nonlinear with transient nonlinear analysis.
  9. kostast88

    Non-Linear Pushover Analysis

    Could you please clarify,where is this video and what accelaeration are you talking about? If you refer to "Accel" as a load type, in nonlinear load case window, then this is defined to tell the program that the lateral load will be incremental at say, 'UX' direction with a scale factor of...
  10. kostast88

    P-M Interaction Ratios to PDF

    print screen????
  11. kostast88

    NONLINEAR TIME HISTORY ANALYSIS SAP2000

    You haven't assigned either hinges,or nonlinear Link elements to your structure.Noonlinear analysis isn't just a tick in the analysis case and done.Refer to tutorials on nonlinear analysis with sap.Info can also be found on this forum.
  12. kostast88

    Question about Links elements (Sap2000)

    Define a single multilinear plastic element, and enable the DOFs you are interested in. For the nonlinear DOFs (I suspect rotation or θz) check the nonlinear option, and define a backbone curve with different properties for positive and negative force-deformation(the stifness is derived as the...
  13. kostast88

    SAP mesh/constraint problem

    1. You use constraints where you need them or where they are necessary. As IJR said, a little study is necessary on them.If what I see on this image is shell elements, then prefer a Weld constraint,which defines a master node, and all slave nodes in a user defined radius (tolerance) is forced to...
  14. kostast88

    Non-linear modelling

    1. Moment rotation points in the backbone curve are defined as the title implies by the FEMA 356 guidelines (that is θy=(My/EI)*Lp for beams,etc). Refer to the document for further information. 2. This part of the curve cannot be ignored with the auto-hinges.The FEMA 356 curve is very specific...
  15. kostast88

    Non-linear modelling

    If what you try to model is rotational springs, I think that Rotation-z, is R3 and not R2, since R2 is connected with M2 which is minor bending moment (and since your problem is 2D, your springs should respond to M3). Not 200% sure though. Why go with NLlinks and not with hinges?

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