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Recent content by lukeme

  1. lukeme

    How to do Hilbert Transform in Matlab?

    Dear forum members, Do you know if it is possible to perform the Hilbert transform of simple function, say, f(t)=sin(t) in Matlab? Thanks so much.. Luke
  2. lukeme

    Legend onto the line directly in Figure?

    Dear members, Is it possible, while drawing figures, to add a legend direclty onto the lines of a figure instead of having a seperate legend box. In other words, consider the following as curves/lines in a plot, is it possible to do -------P=2-------- .......P=3....... _______p=4_______ and...
  3. lukeme

    Vibration of a Simple beam under compression?

    Thank you stressed.. I got it :P Luke
  4. lukeme

    Axial load level as a percentage of Buckling load?

    Thank you guys for your replies, But I was just wondering about the ratio of the axial load present at that column (not the capacity of the column) to its buckling load. Thanks so much for your input :)
  5. lukeme

    Vibration of a Simple beam under compression?

    Dear friends, How can I determine the transverse natural frequencies of simply supported beam under an axial compressive loading? When I apply the loading at supports, no changes in the freqeuncies occur beacuse, I guess, the beam does not feel it is under axial loading. Specifcally, how can I...
  6. lukeme

    Axial load level as a percentage of Buckling load?

    Dear forum members, I would like to know the level of axial load of a column (or beam) in a concrete or steel frame at service conditions as a percentage of buckling load.(1%, 10%, 50% or what?) Any body has an idea? Pls help. Thanks very much. Luke
  7. lukeme

    PushOver example?

    dear zer, thanks for your help but I know of that movie, it does not give any details of the analysis procedure. what I d like to learn are the essence of the Pushover and how you d perform for a simple RC structure, issues related with modeling the steel bars in the elements etc. Any...
  8. lukeme

    PushOver example?

    Dear members, Does anyone have pushover examples performed using SAP2000 (ETABS or DRAIN2D)? Please help. Thanks so much. Luke
  9. lukeme

    FEA course notes

    dear feadude, I am looking for college (undergrad or grad) FE course notes. dear TSG4 and GBor http://ocw.mit.edu/index.html did not work for me, as no course on FE there. There is a similar course but the course notes are taken by handwriting-namelly, hard to read & understand. Plz let me...
  10. lukeme

    FEA course notes

    Dear members, Do u know of free course notes (or related materials) of FE or introduction to FE? Please help. Luke
  11. lukeme

    How to define a rotational spring?

    Dear mmachado30, I appreciate your reply. Thank you. Luke
  12. lukeme

    How to define a rotational spring?

    Dear forum members, I would like to model a local flexibility, caused by a crack on a beam, through a rotational spring. The spring has stiffness about Z axis only, the spring assumed to be fixed at other directions. To model this spring, what kind of element should I use? and what...
  13. lukeme

    How to define a Timoshenko beam

    Dear Drej, The analytical work I have been doing is to drive the equation of motion of a Timosheko beam governing the transverse osccillation of the beam. Then imposing the initial conditions (support conditons), I try to find the modal response (frequencies, mode shapes etc.) I need to...
  14. lukeme

    How to define a Timoshenko beam

    Dear Drej, I have been investigating the effects of shear def. and rotational inertia on the frequencies of a beam, that s why I need to use Timoshenko beam. I did some analytical work and got the results. However, the results seem incorrect and need to compare them with true/actual values. I...
  15. lukeme

    How to define a Timoshenko beam

    Dear Claudio or drej, Thanks so much for your reply but I could not really understand this Ansys and have not been able to find the frequencies of a simple Timoshenko beam. I am also trying to find them by hand but the results are contradictory. I am realy desperate. Would you please find...
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