By ACI Committee 301
ACI 301 covers normal development necessities for cast-in-place structural concrete and slabs-on-ground. the 1st 5 sections hide fabrics and proportioning of concrete; reinforcement and prestressing metal; creation, putting, completing, and curing of concrete; formwork functionality standards and building; therapy of joints; embedded goods, fix of floor defects; and completing of shaped and unformed surfaces. Provisions governing checking out, evaluate, and recognition of concrete in addition to attractiveness of the constructions are incorporated. the rest sections are dedicated to architectural concrete, light-weight concrete, mass concrete, posttensioned concrete, shrinkage-compensating concrete, commercial ground slabs, tilt-up development, precast structural concrete, and precast architectural concrete.
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Extra info for ACI 301-10: Specifications for Structural Concrete
It is assumed that the value of the design variable B for the chosen joint is obtained according to the Danish offshore code (DS 449) (the format of which is similar Part One Keynote Lectures 30 to the general format of the Euro-cades) . qk 1/Jqqk 1/Jqqk 1/Jqqk nd1 · · · nd5 1/Jssk "fJSk 1/JsSk 1/Jssk 1/JvVk 1/JvVk "fJVk 1/Jvvk o o o o Pdl · · · Pd5 mdl' · = 1/JwWk 1/JwWk 1/JwWk "fJWk (2) substituted together with the design values Pud = Puk/"fm, mud = m"k/"fm, nud = nuk/'Ym of the resistance variables into the limit-state equation (1).
3 Optimal reliability The discussion of the problem about the choice of the reliability level can conveniently be supported on the following often considered simplified decision theoretical model. The anticipated capital investment in a structure under design is obviously a function c(p) of the required failure probability p. This function can be assumed tobe decreasing. ) measured in monetary units. For each value of p we thus have a lottery (a game) between two consequences, namely a consequence with the utility -c(p) corresponding to the event of no failure, and a consequence with the utility -2c(p) - d corresponding to the event of failure.
The choice among the remaining code formats is arbitrary, as pointed out long ago by Freudenthal . A requirement of reasonable calculational operability may rule out some further formats. Left over with a finite set of different probabilistic code formats we need a principle for making a unique choice among these formats. Referring first to the tubular joint example with the limit state (1) the prudency principle is to choose that code format for which there is minimum of the coefficient of variation of the reliability index for the population of designs obtained according to the given partial safety factor code with fixed factor values.