Deflection of Trusses Virtual Work Method

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  • Опубліковано 15 гру 2024

КОМЕНТАРІ • 33

  • @reza1001us
    @reza1001us 6 місяців тому +2

    It was a good and complete example. Thank you.

  • @qashafi2754
    @qashafi2754 2 роки тому +2

    Nice presentation. Explained and solved in a very simple way. Thank you very much

    • @nadimshbeeb417
      @nadimshbeeb417  2 роки тому +1

      You're welcome. And thanks for the feedback

  • @tayoojumiri8820
    @tayoojumiri8820 27 днів тому

    I understand very much better now, Thank you❤

  • @jaimechavez9466
    @jaimechavez9466 2 роки тому +1

    where does the 4.5 come from? i am assuming he is using pythagoram theorm which will be square root of 2.25^2 + 3.5^2 which equals to 4.16 rather than 4.5, right?

  • @francesloveend.galang4463
    @francesloveend.galang4463 3 роки тому +1

    Where does 1.36 came from? Timestamp (10:12)

    • @nadimshbeeb417
      @nadimshbeeb417  3 роки тому +1

      It should be 1.2 not 1.36

    • @francesloveend.galang4463
      @francesloveend.galang4463 3 роки тому

      @@nadimshbeeb417 thank you sir! May I ask sir, what if I also have a given settlement. I want to find vertical displacement due to settlement and fabrication error. What formula should I use sir? 😊

    • @nadimshbeeb417
      @nadimshbeeb417  3 роки тому

      In that case you would multiply the reaction due to the virtual system with the actual settlement value at that reaction (support) and add or subtract depending on direction to the required displacement and equate to zero since there is no internal work

    • @francesloveend.galang4463
      @francesloveend.galang4463 3 роки тому

      @@nadimshbeeb417
      Sir can you check?
      Problem is: AB and and BD are fabricated 3/4 in too long and support D settles 0.25 in.
      Reaction of Support D in virtual system: 1/2 kips
      Settlement at D: 0.25 in
      Fv of AB = (-5/8) kips
      Fv of BD = (-5/8) kips
      Fabrication error = 3/4 in
      Solution for vertical displacement due to settlement and fabrication error:
      (1/2 kips)(0.25 in) + (-5/8 kips)(3/4 in)(2 members) = - 0.8125 in.
      I wonder if I got it right. Thank you so much sir! ❤️

    • @nadimshbeeb417
      @nadimshbeeb417  3 роки тому

      As an equation it looks good but I have no sense for the direction.

  • @Senamile_Mphandle
    @Senamile_Mphandle Рік тому

    Is A a pin or roller?

  • @Mohamed-ef5zw
    @Mohamed-ef5zw 2 роки тому

    How can I check if this deflection is acceptable or not?

    • @nadimshbeeb417
      @nadimshbeeb417  2 роки тому

      It depends on the design codes.

    • @Mohamed-ef5zw
      @Mohamed-ef5zw 2 роки тому

      @@nadimshbeeb417 what is the deflection limit for truss in Euro Code?

    • @nadimshbeeb417
      @nadimshbeeb417  2 роки тому

      www.newsteelconstruction.com/wp/eurocode-design-factors-and-limits/

  • @ntonyjaime_
    @ntonyjaime_ Рік тому

    How did you get n

    • @nadimshbeeb417
      @nadimshbeeb417  Рік тому +1

      Slide 6

    • @ntonyjaime_
      @ntonyjaime_ Рік тому

      ​@@nadimshbeeb417oh so like n,are the forces found in the virtual system? And I have one more question, assuming the forces pointing down are horizontal instead how would you represent that in the virtual system

    • @nadimshbeeb417
      @nadimshbeeb417  Рік тому

      Yes, they are the virtual system. Regarding your second question, the virtual system is the system where you want your displacement. If you've noticed, I used the same virtual system to answer all questions. If you change the original loading and still want to find the vertical displacement at E, you can use the same virtual system.

  • @danz02TB
    @danz02TB Рік тому

    how did you get -0.59KN

  • @kwakuboateng2068
    @kwakuboateng2068 2 роки тому +1

    I don't understand how he got the 57.26°

    • @Zii3zoz
      @Zii3zoz 2 роки тому +1

      I pretty sure instead of 2.5 its 2.25 so it will be tan -¹= 3.5/2.25 = 57.26

    • @jaimechavez9466
      @jaimechavez9466 2 роки тому

      @@Zii3zoz where does the 4.5 come from? i am assuming he is using pythagoram theorm which will be square root of 2.25^2 + 3.5^2 which equals to 4.16 rather than 4.5, right?

    • @nadimshbeeb417
      @nadimshbeeb417  2 роки тому +1

      You're right it is 2.25 not 2.5

    • @nadimshbeeb417
      @nadimshbeeb417  2 роки тому

      Members AE, EB and CD are 4.5 (2.25+2.25). The rest are 4.16 (rounded to 4.2)

    • @ricardoarturolaraperaza9988
      @ricardoarturolaraperaza9988 Рік тому

      @@Zii3zoz EXACTLY