Posted by: Remodeler ® 05/31/2004, 11:48:58 Author Profile Mail author Edit

I am installing 2 steel 90 degree angle beams each 1/2 inch thick 5 inches x 5 inches by 11 feet.  These beams will be used as support in a house where I am removing a first floor wall.  The beams will be placed so that one flage of each beam is perpendicular to the ceiling (that is flanges are going into ceiling) while the other flanges will be parallel to the ceiling and supporting the second floor floor joists.  What I need to know is where I can get information to caluclate the type and size of pipe I will need to support these beams on both ends.  The length of these support pipes that I would place under each beam is about 8 foot 8 inches.  Thanks in advance

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Re: need help pipe strength
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Posted by: jcmcgraw ® 06/03/2004, 11:16:10 Author Profile Mail author Edit

One other major thing you want to look at in supporting your new beam.  The foot print of the base plate of your column, and the thickness of the plate used.  With the pipe alone, you will only have 2.23 square inches of surface area at the end of the pipe on your first floor structure (if I am reading your original post correctly).  The base plate will have to spread this area out.  If you can, I would suggest using a 1/2" plate at least 8"x8".....giving you a bearing area of 64 square inches.  The size of this base plate will be "the bigger the better".

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Re: need help pipe strength
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Posted by: acroduster1 ® 06/03/2004, 08:23:20 Author Profile Mail author Edit

As McGraw said, steel pipes are pretty strong. A 3.5" dia x 0.216" wall thickness (std. 3" pipe) is good for 31,000 lbs @ 9' length! This even takes into consideration buckling effects... Acro

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Re: need help pipe strength
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Posted by: jcmcgraw ® 06/01/2004, 13:06:30 Author Profile Mail author Edit

This is just a thought, but wouldn't you be ahead to go to a hardware store or Lowes or some other home center and purchase a couple of the support tubes that are in most homes?  They are designed to be used just as you are planning, only they have adjustable hardened steel screw threads that allow them to be "fine tuned" to the height you are planning. As far as using pipe in this situation.  The compression strength in heavy walled pipe is really high. According to the Steel Construction Manual; standard wall pipe is calculated with a load capacity of 36 kips/square in.

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