Differentiate between rectangular beam and flange beam

[tzx9633]

Homework Statement

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

Homework Equations

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 . [/B]

 

[anorlunda]

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

 

[tzx9633]

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

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 ?

 

[anorlunda]

Part C of the question says find the "ultimate" design. That is meaningless unless you show a comparison of more than one design.

 

[tzx9633]

Part C of the question says find the "ultimate" design. That is meaningless unless you show a comparison of more than one design.

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 ?

 

[tzx9633]

Part C of the question says find the "ultimate" design. That is meaningless unless you show a comparison of more than one design.

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 doesn't have beams and slab are cast together, am i right ?

 

[anorlunda]

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

 

[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 .

 

[tzx9633]

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 .

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 ??

 

[tzx9633]

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 .

afaik , rectangular beam doesn't have beams and slab are cast together

 

[Nidum]

afaik , rectangular beam doesn't have beams and slab are cast together

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 .