Determinate vs Indeterminate Structures - Intro to Structural Analysis

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  • čas přidán 27. 08. 2024

Komentáře • 45

  • @The_Civil_Lab
    @The_Civil_Lab Před rokem +7

    I can't believe I finally found a youtube gem about civil... I've been struggling to find resources, the domain seems void of sharing intellectual knowledge! Thank you sir.

  • @ScottESchmidt
    @ScottESchmidt Před měsícem

    I never learned this method in engineering school, but I can say that most civil engineers with experience and all structural engineers can generally look at a structure like this and determine if it is either statically determinate or indeterminate by inspection. Knowing the degree to which it is indeterminate is interesting, but in practical application, most engineers will just plug it into their computer and let it do the hard part. Thank you again for an excellent video.

  • @StructuresProfH
    @StructuresProfH  Před rokem +1

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  • @islamqa5165
    @islamqa5165 Před rokem +1

    You have a really good natural talent to teach.. it is surely making you feel better that you are helping and serving to students... May Allah bless you.

  • @offthegridengineer2198
    @offthegridengineer2198 Před 2 lety +11

    I greatly thank you for these videos. They are extremely helpful!

  • @jiteshyar1218
    @jiteshyar1218 Před 5 měsíci

    How hard work have done during explanation can be easily noticed
    Really great 👍

  • @zxzhan5287
    @zxzhan5287 Před rokem

    Great and straightforward revision before my structural analysis final exam

  • @Harry-qc6ny
    @Harry-qc6ny Před rokem

    Your teaching style is amazing, very clear, straightforward which confuses me less. Cheers :)

  • @anarmyoftigers
    @anarmyoftigers Před rokem +2

    Great video. You explained it well and I’m happy to have learned something.

  • @felixcsgocs2
    @felixcsgocs2 Před 2 lety +1

    Beautifully explained

  • @MohamedAli-fo3xb
    @MohamedAli-fo3xb Před rokem

    THANK YOU FOR HELPING ME WITH THESE VIDEOS

  • @romarssieverything9667
    @romarssieverything9667 Před 2 lety +1

    thank you! You made this so easy.

  • @MecTudor
    @MecTudor Před 8 měsíci +1

    Hello, what about those systems where DoI=0, but you can't solve the reactions? (the critical ones)

    • @luziya7486
      @luziya7486 Před 5 měsíci

      This is my question as well

    • @MecTudor
      @MecTudor Před 5 měsíci

      @@luziya7486 These systems are very dangerous (they allow some displacements nearby the position of equilibrium and the magnitudes of some reactions are tending to infinite) so you have to avoid them. The problem of recognizing the critical forms is a serious problem.

  • @salemsimeon7471
    @salemsimeon7471 Před 9 měsíci

    Thank you. It was really helpful.

  • @harisshakoor79
    @harisshakoor79 Před 2 lety

    extremely helpful sir. very well explained. Thanks you sir

  • @ronyshamcghee6927
    @ronyshamcghee6927 Před 5 měsíci

    How do you know at what points equilibrium can be considered for the trusses example?

  • @stevenpro7321
    @stevenpro7321 Před 2 lety +1

    Thanks for sharing, it really helps. May I ask a question for the last frame, if there is only one hinge in the middle on the top how could I make the cut?

    • @StructuresProfH
      @StructuresProfH  Před rokem +1

      Great question, because this can get a little weird. Two cases to clarify here.
      (1) If the middle column only has a hinge on one side (instead of hinges on both sides, as shown in the video), then you would only need to make a single cut on the side with the hinge. The degree of indeterminacy would then be: 7 reactions + 6 internal forces - 3*(4 FBDs) = 1... meaning the frame is now indeterminate.
      (2) However, if both beams and the middle column all come together at a single hinged point, that's a bit different. This moment release is now applied to all three members, unlike in Case 1 described above where the hinge-to-the-side only affects a single beam and the column. To "cut" this, you'll separate all three members that connect into this hinge from each other. Once you've done that, you will have identical free body diagrams as in the video, so the DOI is still 0.

    • @stevenpro7321
      @stevenpro7321 Před rokem

      @@StructuresProfH It makes perfect sense and thank you for the explaination.

  • @bekehbenjamin775
    @bekehbenjamin775 Před 2 měsíci

    Does it mean that when ever your calculations gives you zero as an answer, it shows that the trusses is determinate?

    • @StructuresProfH
      @StructuresProfH  Před 2 měsíci

      Yep, zero means determinate (unless there is some other issue that causes instability).

  • @burhanuddinmotiwala1428
    @burhanuddinmotiwala1428 Před 3 měsíci

    for the last example if there were no hinges in the frame then would it be indeterminate to the fourth degree?

  • @ferozpatthan
    @ferozpatthan Před rokem

    Very Nice explanation ...

  • @shivasalehi2199
    @shivasalehi2199 Před 10 měsíci

    Thank you🙏🏼🌺

  • @clanwarme6152
    @clanwarme6152 Před rokem

    I don't understand the frames.. Is there any other simple way..?

    • @StructuresProfH
      @StructuresProfH  Před rokem +2

      There is an equation too. For two-dimensional frames, the Degree of indeterminacy (DOI) can be computed as:
      DOI = Reactions + 3*Members - 3*Connections - Releases
      ... where ...
      Reactions is the total number of reaction forces or moments
      Members is the total number of members (beams, columns, whatever) in the structure
      Connections is the total number of connections between members (including connections to the ground)
      Releases in the total number of hinges, expansion joints, etc. in the structure

  • @Tankaxattri403
    @Tankaxattri403 Před 10 měsíci

    Nice🎉

  • @SrilankanProud1
    @SrilankanProud1 Před rokem

    Thank you

  • @joealex2463
    @joealex2463 Před 3 měsíci

    how do you find r?

    • @StructuresProfH
      @StructuresProfH  Před 3 měsíci +1

      "r" is the number of releases, where a release counts as a single known internal force. So for example, a hinge in a beam forces the bending moment to be zero at that location - that counts as one release, because we know that M = 0 at that point. You can also have releases for shear and axial forces as well. These can even be combined. For example, a roller-like expansion joint in a bridge might count as two releases if both the axial force N = 0 and the bending moment M = 0 at that location.

    • @joealex2463
      @joealex2463 Před 3 měsíci

      @@StructuresProfH thank you!