# Homework Help: Differentiate between rectangular beam and flange beam

1. Dec 29, 2017

### tzx9633

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. Dec 29, 2017

### Staff: Mentor

As i read it, you need to design it both ways and then compare the two.

3. Dec 29, 2017

### tzx9633

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 ?

4. Dec 29, 2017

### 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.

5. Dec 29, 2017

### tzx9633

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 ?

6. Dec 30, 2017

### tzx9633

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 ?

7. Dec 30, 2017

### Staff: Mentor

You're beyond my expertise. I'll let someone else answer.

8. Dec 30, 2017

### Nidum

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 .

9. Dec 30, 2017

### tzx9633

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 ??

10. Dec 30, 2017

### tzx9633

afaik , rectangular beam doesnt have beams and slab are cast together

11. Dec 30, 2017

### Nidum

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 .