Web Holes
Web Holes
(OP)
I am currenly working on a project and there is a W36x135 and our client would like to place holes in the Web. They would like to place 3-3" Diameter holes in 4 different locations along the beam. The beam is 32' long. The first set of holes would be at 4' on each end and the other sets placed 8' apart.
I am looking for a good revference with examples. All I can find is the ASCE Task Committe (7.33, 7.34) should serve as a basic guid but I have not been able to locate this information.
I am looking for a good revference with examples. All I can find is the ASCE Task Committe (7.33, 7.34) should serve as a basic guid but I have not been able to locate this information.






RE: Web Holes
RE: Web Holes
RE: Web Holes
In this case, the holes are no problem. Space them on about 9" centres, leaving 6" of meat between the holes, and at middepth.
For larger holes, there are probably already threads dealing with them.
COEngineer, lost your glasses?
RE: Web Holes
RE: Web Holes
They do these type of holes all the time and often dont tell the engineer. The AISC design guide is really applicable for larger holes.
RE: Web Holes
Just to be complete though, this isn't something like a transfer girder with a 900 kip reaction landing right on top of one of these holes, right?
RE: Web Holes
Like others have said, I doubt a hole like that will have a large effect but it may be significant if you are already near capacity. It's worth checking imo.
RE: Web Holes
RE: Web Holes
This beam does not have a 900 kip load on the beam anywhere.
My concern was not necessarily one hole but there would be a total of 12 holes in the beam.
RE: Web Holes
RE: Web Holes
RE: Web Holes
RE: Web Holes
If you have it in the middle third, the stress concentration factors actually work in your favor. The elastic stress is only 1/3 of the maximum and the concentration factor wont be more than 3. The result is just better utilisation of the steel above and below the hole.
regards
csd