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1spark (Electrical)
12 Mar 06 22:04
Iam an electrician trying to read and understand the structural drawings of a hospital project that I am working on.
In effort to properly locate sleeves for conduits in poured-in-place concrete walls, I need to determine the depth of beams.
Is there a rule-of-thumb for determining beam size or do I need a chart or manual?
Examples:  
(1)Is a W27X94 beam 27" deep, or is the actual depth determined by the weight per foot?

(2)Is a W14X311 column 14" square, or is the actual size determined by the weight per foot?

Any help is appreciated.
Helpful Member!(2)  mrMikee (Structural)
12 Mar 06 22:31
A W27 beam is nominally 27" deep but the actual depth will increase as the the weight per foot increases.  The lightest W27 is 84# with a depth of 26.71" and the heaviest is 178# at 27.81".  There is no general rule for the flange width since WF shapes are rolled in several diferent series.  

The W14 is rolled in a wide range of sizes from 22# (th=13.74"  and flange=5.000") to 730# (depth=22.42" and flange=17.89".)

The W14x311 you mentioned is:
depth=17.12
width=16.23

If you need more info you could try going online to a site of a supplier like Ryerson for example.

Regards,
-Mike
Helpful Member!(3)  UcfSE (Structural)
13 Mar 06 2:29
Check out this page from efunda.  You can check off what beams you want and it will give you section dimensions.  They were right for the few I checked.

Steel Wide-Flange Section Dimensions from Efunda

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