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Re: Holes in Steel beams

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CSA S16 "Design of Steel Structures" Section 14 does address this issue, although it is Limit States Design (Your LRFD) along with worked examples. If you wish, I can send you copies of the pages by fax or e-mail. They deal more with rectangular holes, but I believe there is reference to round holes. The spec does allow unreinforced holes in the centre half of the length within a centre depth not exceeding 1/3 of the beam depth. There are a few other restrictions but your case seems to meet those.

On 10/3/2014 4:05 AM, Joe Venuti wrote:
I have several W16x50 beams that we need to make 3" dia. penetrations
through. The fabricator was asking if they could cut circular openings and place a 4" dia std pipe x 2" long through the web and fillet weld around the pipe on both sides of the web. The openings would be at mid- height of beam. I contacted steel solutions center and their response was The AISC Specification does not address this particular condition so you will have to use your own judgment

The main span 30'-6" with 5'-6" cantilever each end. Holes will be 3ft- 6ft out from supports and third at 11'-6" out from support. Max moment is
44.2ft-kips Live and 31.0ft-kips Dead

What have others done in similar situation ?

Joe Venuti

Joven Engineering

P.O. Box 5098

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