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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

i expected you asked about stringers between main truss.

(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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