calculating loads on concrete forms
calculating loads on concrete forms
(OP)
Anyone know how to calculate a load due to concrete ( poured )on forms. Is it as simple as if it was water? ( density x height for pressure ? )
THanks
THanks
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calculating loads on concrete forms
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RE: calculating loads on concrete forms
RE: calculating loads on concrete forms
RE: calculating loads on concrete forms
RE: calculating loads on concrete forms
Your original question says "...load due to concrete (poured) ON forms." To me that implies a deck or suspended slab. Your second post implies a wall - there is a BIG difference!
RE: calculating loads on concrete forms
RE: calculating loads on concrete forms
Boy it is hard to believe that the same lateral load will be experienced by the forms regardless of wall thickness. I know theory dictates it but when you look at it in a practical sense you would think that a 2" thick 5ft high wall would exert a lot less lateral load on the forms than a 10" wall.
Thank you again!
RE: calculating loads on concrete forms
RE: calculating loads on concrete forms
Hurd, M.K., "Formwork for Concrete, SP-4", 6th Edition, American Concrete Institute, Farmington Hills, MI, 1995, 500 pp.
Also, the October 2003 issue of "Concrete International", the magazine of the Amercian Concrete Institute, on pages 41-46, had an article titled "Using Interactive Spreadsheets for Teaching Concrete Formwork Design". A good article on formwork and an example of speadsheet design for formwork calculations.
RE: calculating loads on concrete forms
Regards
RE: calculating loads on concrete forms
Internal frictions can induce a 2 ft high 8" wall poured over a slab and free to flow out at the bottom. If it were fluid, it wouldn't stand up to this head pressure. It would all flow out the bottom.
I'm sure there's many factors involved. Including mix design and choice of agregates and admixtures. Age of mix, temperature, consolidation, vibration.
I wouldn't so quickly discount the form thickness either. I'm sure a 2" thick wall would stand much higher than an 8 inch wall. It may have something to do with surface friction. In which case, the wall pressure of an 8" wall would be higher than a 2" wall.
The form designers have rules, but they aren't as simple as suggested.
RE: calculating loads on concrete forms
As stated above, treating concrete as a fluid (in a wall) is very conservative; the "slump" of water is 12 inches, compared with 3 to 6 inches for "typical" fresh concrete.