BOX SECTION PROPORTIONS IN LRFD BRIDGE SPEC.2007

[CHARLESCOSTA]

Hi,
I was looking for proportions of web and flange for single box section in lrfd bridge spec-2007{SI edition).In 6.10.2 I could get these values for I section.In 6.11.2.2 these values for tub section are given.However proportions for box section could not be found (like ratio of compression flange width to flange thickness).Did I miss it somewhere
or its omitted (which would be really surprising).Your
help is requested in this matter.Thanks in advance.

 

[bridgebuster]

Is this what you mean by box? []
Is this what you mean by tub? T_T

This shape, [], is typically used for truss chord members - although I did use it for a pedestrian bridge - and not used a girder. If you use the [] as a bending member you have to follow the proportions for a tub.

 

[Dinosaur]

I recommend moving this to the Bridge Design section.

 

[CHARLESCOSTA]

Bridgebuster,
Your notation of box and tub section is same as given in AASHTO bridge design spec 2007 and this was what I meant.
However finally I could locate flange proportion for box section.In 6.11.8.2.2.Actually flexure resistance for compression flange is given in terms of flange slenderness
b/t.So in other words for given compressive stress in flange maximum allowable b/t can be found out.For I and tub section b/t is explicitly given to be <=24t.