While according to Eurocde 2, section 5.10.8, at ULS, it is necessary partial factors for preload (being 1.2 and 0.8). In the ACI code partial factor for preload is equal to 1.0 (only it is equal to 1.2 in anchorage zones).
Why is there such a difference? Does it exist any other factor according to ACI that involves the uncertainties of the preloading?
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