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# Flange Width vs Deep of Beam Limit Criteria

## Flange Width vs Deep of Beam Limit Criteria

(OP)
Hi, i am designing a truss bridge. Is it possible to use fabricated steel section like I girder with 450mm deep [gross], 550mm width flange, 35mm thick web and 40mm thick flange?

I know the boundary in AASHTO/AISC for limiting the minimum width of flange and thickness of flange and web due local buckling, but i don't seen any maximum limit of flange width versus deep of beam of I girder.

Is possible to use larger width flange I girder/member comparing to it's deep?

Regards.

### RE: Flange Width vs Deep of Beam Limit Criteria

Yes, check flange local buckling criteria for the steel yield strength.

### RE: Flange Width vs Deep of Beam Limit Criteria

you have to calculate effective width. because, it may be effective width less than designing width of flange according to beam theory.

### RE: Flange Width vs Deep of Beam Limit Criteria

(OP)
Effective with for composite?
This is for truss bridge, not for composite bridge with slab.

Effective width to Beam theory? I don't know. What i know is Timoshenko Beam theory consider the shear coefficient. It's that what you mean? I think it only effects on bendings which minor in this truss bridge beam.

### RE: Flange Width vs Deep of Beam Limit Criteria

(you know that you cannot design too wide flange girder if it's a bending element)

### RE: Flange Width vs Deep of Beam Limit Criteria

(OP)
Nope, it's a frame of truss bridge, not a stringer

### RE: Flange Width vs Deep of Beam Limit Criteria

How about using higher strength steel?

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