temporary stress increase for concrete
temporary stress increase for concrete
(OP)
Is there an allowable stress increase for concrete under temporary load? If so, where is this stated, what is the duration for temporary stress increase?
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temporary stress increase for concrete
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temporary stress increase for concretetemporary stress increase for concrete(OP)
Is there an allowable stress increase for concrete under temporary load? If so, where is this stated, what is the duration for temporary stress increase?
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RE: temporary stress increase for concrete
When you push on a wood board, you expect it to bend a little and pop back into place.
When you push on a concrete beam, it will crack and stay how it is.
RE: temporary stress increase for concrete
RE: temporary stress increase for concrete
For prestressed you can even exceed 12sqrt(fc')now so there really is not a limit so long as you meet other criteria for design and detailing.
Unless your specification documents or exposed condition requires you to keep the stresses below 5 to 7.5 sqrt(fc`) you can go as high as you need to so long as your crack width is within limits and your deflection also meets ACI. You should properly detail your section for crack control also.
See ACI 318-02:
9.5,10.6, & 18.4
Beyond that there is not a temporary stress increase you can use if you have specific limits specked out. Even though it is a temporary load as AggieYank points out it has lasting affects on the concrete member. You can't totally un-crack a cracked concrete beam.
RE: temporary stress increase for concrete