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Homework Help: Differentiate between rectangular beam and flange beam

  1. Dec 29, 2017 #1
    1. The problem statement, all variables and given/known data
    How to differentiate between rectangular beam and flange beam ??? In the question below , the answer provided is flange beam , I'm wondering can i design it as rectangular beam

    2. Relevant equations


    3. The attempt at a solution

    Since there's no clue whether the flange beam or rectangular beam , i think i can also design it as retcnagular beam . Correct me if i am wrong .
     

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  2. jcsd
  3. Dec 29, 2017 #2

    anorlunda

    Staff: Mentor

    As i read it, you need to design it both ways and then compare the two.
     
  4. Dec 29, 2017 #3
    ok , thanks for the answer ... how if other question ? Is there any specific clue that we should use flange or rectangular beam ? In what conditions , we should use flange beam ?
     
  5. Dec 29, 2017 #4

    anorlunda

    Staff: Mentor

    Part C of the question says find the "ultimate" design. That is meaningless unless you show a comparison of more than one design.
     
  6. Dec 29, 2017 #5
    how if other question ( not this question) ? Is there any specific clue that we should use flange or rectangular beam ? In what conditions , we should use flange beam ?
     
  7. Dec 30, 2017 #6
    Since the question specifies that the beams and slab are cast together, can i say that the beam must be 100% flange beam ? IMO , the rectangular beam doesnt have beams and slab are cast together, am i right ?
     
  8. Dec 30, 2017 #7

    anorlunda

    Staff: Mentor

    You're beyond my expertise. I'll let someone else answer.
     
  9. Dec 30, 2017 #8

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    There just is not enough definite information given in the problem statement .

    So it's down to @tzx9633's judgement - if designing this floor slab for real what would he use ? What is commonly used in such situations ?

    That's how things work in engineering . There is seldom enough definite information provided at the start of a new project .
     
  10. Dec 30, 2017 #9
    This is just a coursework question , it's just an question from the exercise ...Since the question specifies that the beams and slab are cast together, can i say that the beam must be 100% flange beam ??
     
  11. Dec 30, 2017 #10
    afaik , rectangular beam doesnt have beams and slab are cast together
     
  12. Dec 30, 2017 #11

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    That's a valid observation . So you can reasonably make the decision that it needs to be a flanged beam . That is what I would have decided on as well .

    Really any beam being cast directly into a concrete slab has to have features which lock into the concrete . These features occur naturally in a flanged beam but would have to be provided as extras for any type of flat sided beam .
     
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