# Beam math

• posted on September 3, 2004, 11:51 pm
I'm planning on removing a load bearing wall, so I've been doing some preliminary investigation. Don't worry I'll have an engineer when I can find one willing to do a small job.
The wall in question is about 16' and is located on the main floor of a two story house. The basement has a 20' steel beam (W10x30) in the same location. I was concerned that placing the end post of the upstairs beam 4' from the end of the basement beam would stress the steel beam too much. So I plugged the numbers (1200 * 20 vs 1200 * 4 + 9600 + 9600) into a couple of beam programs and discovered that the deflection numbers actually decreased. I must be missing something here?
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• posted on September 4, 2004, 5:30 am
wrote:

that beam's deflections.
Brian W
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• posted on September 4, 2004, 8:52 am

Check the shear - it might be the limiting condition. Also even if the shear checks out, web stiffeners might be advisable.
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rich

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• posted on September 4, 2004, 11:02 am
rich wrote:

-rob
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• posted on September 4, 2004, 2:47 pm
wrote:

Thanks for the responses.
Shear seems OK. According to the #s the beam is marginal in it's original configuration, although we've never experienced any significant bounce. My 1200 figure ((40L + 30L + 30D) *12) is probably 10% over code though.
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• posted on September 7, 2004, 9:46 am
William Pounds wrote:

think I read that the average occupancy live load in a house is 6 psf. Additionally, the more stories a beam carries, typically, the less it bounces due to damping from walls etc.
-rob
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• posted on September 4, 2004, 12:34 pm
I thought you'd say some thing like if you have one bottle of Jim Beam you get a lot of friends and some work done. Two bottles, you get more friends and less work.
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Christopher A. Young