What does crack stress in handling a concrete pile really mean?
What does crack stress in handling a concrete pile really mean?
(OP)
I checked in ACI318 and PCI Handbook, but can't find such a terminology crack stress in handling a concrete pile. Is this "crack stress" during handling a concrete pile a bogus terminology and the question asking for the "crack stress" during handling a concrete pile a bogus question?
Previously I thought it may imply allowable handling stress of a concrete pile which equals 6*sqrt(fc')+fpc with fpc=0(see <<Foundtion Design --- Principles and Practices>> by Donald P. Coduto. After a second thinking, it seems crack stress and allowable handling stress can't mean same thing. So What does this "crack stress" really mean? Does anybody know?
Thanks a lot for your help!
Previously I thought it may imply allowable handling stress of a concrete pile which equals 6*sqrt(fc')+fpc with fpc=0(see <<Foundtion Design --- Principles and Practices>> by Donald P. Coduto. After a second thinking, it seems crack stress and allowable handling stress can't mean same thing. So What does this "crack stress" really mean? Does anybody know?
Thanks a lot for your help!






RE: What does crack stress in handling a concrete pile really mean?
I would just ask for calcs showing that the strength is ok for however they plan to rig it during erection.
RE: What does crack stress in handling a concrete pile really mean?
Suppose in a test you were asked to answer how many psi the crack stress in handling a concrete pile is and the only information given to you is the concrete fc'. Would you think it is a bogus question?
RE: What does crack stress in handling a concrete pile really mean?
RE: What does crack stress in handling a concrete pile really mean?
RE: What does crack stress in handling a concrete pile really mean?
It seems very few people visits the Concrete Pile Engineering forum and even less people responds to the question, therefore I posted here seeking for help.
StructuralEIT:
Yes, my first reaction is also to consider fr=7.5(f'c)^0.5 as the crack stress. But the maximum value it gives you to select is 6(f'c)^0.5, the other values given to you include
1.5(f'c)^0.5, 3(f'c)^0.5, and 4.5(f'c)^0.5. None of 7.5(f'c)^0.5 as your choice.
I am thinking could it be possible that it is asking for the permissible stress at transfer which will equal 3(f'c)^0.5? But I am still suspect where the word "crack stress comes from. Any thought?
Thanks!
RE: What does crack stress in handling a concrete pile really mean?
RE: What does crack stress in handling a concrete pile really mean?