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Q: I Beam span and size calculations ( No Answer,   3 Comments )
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 Subject: I Beam span and size calculations Category: Reference, Education and News Asked by: don1944-ga List Price: \$25.00 Posted: 16 Sep 2006 09:49 PDT Expires: 16 Oct 2006 09:49 PDT Question ID: 765839
 ```Need to calculate the I beam size for an underground construction. the building is (inside dementions 60 feet X 100 feet. The walls are reinforced concrete 24' wide, the colum for I beam support is 18" on each end. There will be a reinforced concrete roof (which this beam will support) of 18". There will be 12 inches of pea gravel (for drainage) and 36 inches of soil on top of the structure. I have assumed a soil moisture rate at 1 cu ft of water (68# sq ft) pea gravel at 112 # sq Ft soil at 93# sq ft. I do not know how to calculate the wieght of a d8 dozzer to push the soil over the structure, do I calc the full amount of the dozer divided by the foot print of tracks ???? What size of I beam would be needed for a 4 ft spacing on center?``` Request for Question Clarification by redhoss-ga on 23 Sep 2006 06:08 PDT ```I didn't mean to discourage you. I was just trying to make things easier. If you want, I can answer your question as stated.```
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 ```What about using temporary construction support so you don't have to consider the dozer weight.```
 `Can't you use a Bobcat?`
 ```Don - It sounds you are preparing a bunker for nuclear war. You should watch the movie "Blast from the Past" for ideas. Back to your point: If you are considering a construction project of this magnitude slapped together without the assistance of a structural engineer and a qualified contractor, you are exposing yourself to enormous risk of collapse. For starters, support columns on 20 foot centers (permanent, not temporary) would go a long way toward a more practical, safe, and cost effective design. You didn't specify if money is no object. 60 foot clear spans would not be an I-beam exactly. It would have to be a fabricated truss. Here is a primer in bridge and truss design to give you a sense of the complexity of your project: http://pghbridges.com/basics.htm This could easily get mighty expensive, hence the advantage of additional interior supports, which would allow the use of simple beams. Please take my advice - This is definitely not a job for a beginner. Good luck! Big Blue```