pre-engineered metal building
pre-engineered metal building
(OP)
Howcome the horizontal component of reaction at base of pre-engineered metal building is significantly high that we need hair pins?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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pre-engineered metal building
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RE: pre-engineered metal building
RE: pre-engineered metal building
These large thrusts mentioned by jike also are often offset vertically from the footing far enough to cause the footing overturning ratio to be a problem. Using some kind of reinforcement in the slab resists these forces at a more favorable elevation.
Many people will not use hairpins or other reinforcement because of the argument that somebody will eventually cut it. It's a valid concern, but I have a hard time getting too worked up over it. The actual likely load is nowhere near the design live load except in heavy snow areas. There's also the unscientific observation that I've never heard of a metal building failing because the footing slid, causing a roller instead of a pin boundary condition.
BTW, the correct 2005 terminologiy is Metal Building System -- there's not much pre-engineered about these things nowadays.
14159
RE: pre-engineered metal building
RE: pre-engineered metal building
This is usually done in the smaller buildings but can conceivably be done for larger - just costs more. This may explain those times when you saw cracks without reinforcing ties in the slab.
But the lateral forces must be resisted in some fashion.
RE: pre-engineered metal building
RE: pre-engineered metal building
For larger thrust loads I use a tie beam instead of counting on the slab reinforcing. Tie beams have to have mechanical splices instead of lap splices per ACI tension members.
RE: pre-engineered metal building
RE: pre-engineered metal building
My opinion is the slab tie is a stiffer connection and more reliable than trying to get resistance out of a foundation, unless you have something like a drilled pier foundation.