Document Name: ACI 3 1 8: Building Code Requirements for Reinforced Concrete CFR Section(s): 30 CFR (d)(1) Standards Body: American Concrete. BY ORDER OF THE EXECUTIVE DIRECTOROffice of the Federal RegisterWashington, Authority of the Code of Federal Regulations. ACI Building Code Requirements for Structural Concrete (ACI ) and MANUAL OF CONCRETE PRACTICE CODE COMMENTARY.
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Depth, d, in flexural members and columns where d is more than 24 in.: Unless otherwise provided, the bending moments at the criti- cal sections of the column and middle strips shall be at least those given in Table f.
When the compression steel does not yield at ultimate strength, or when effects of compression steel are neglected, p shall not exceed 0. In solid slabs the piping, except for radiant heating and snow melting, shall be placed between the top and bottom reinforcement. The change in length of columns and slabs due to direct stress, and deflections due to shear, may be neglected. In structures in which it is normal practice to take into account creep, elastic deformation, shrinkage, and temperature, the effects of such items shall be considered on the same basis as the effects of dead load.
Stirrups in excess of those normally required are provided each way from the cut off a distance equal to three-fourths of the 38-92 of the beam. In continuous spans, the moment of inertia may be taken as the average of the values obtained for the positive and negative moment regions. Unbonded tendons acj free to move rela- tive to the surrounding concrete.
Full text of “ACI Building Code Requirements for Reinforced Concrete”
Lapped splices of wires in regions of maximum stress where they are carrying more than one-half of the permissible stress shall be avoided wherever possible; such splices where used shall be so made that the overlap measured between outermost cross wires of each fabric sheet is not less than the spacing of the cross wires plus 3318-92 in.
Such conduits or pipes shall be so located as not to impair the strength of the construction. In tied columns the amount of reinforcement spliced by lap- ping shall not exceed a steel ratio of 0. The slab or footing acting essentially as a wide beam, with a potential diagonal crack extending in a plane across the entire width.
Building Code Requirements for Structural Plain Concrete Aci 318-92
Halfway between the face of the column or pedestal and the edge of the metallic base, for footings under metallic bases qci The width resisting compression at any section shall be assumed as the entire width of the top of the footing at the section under con- sideration. In considering the combination of dead, live, and wind loads, Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on Precast concrete—A plain or reinforced concrete element cast in other than its final position in the structure.
Metal aco or spirals so designed shall be placed near not more than eight bar diameters from the point of bend. This strength may be demon- strated by job-cured test specimens and by a structural analysis con- sidering the proposed loads in relation to these test strengths. In any area common to one column strip and one middle strip, openings may interrupt one-quarter of the bars in either 318-29.
Horizontal disposition of ducts shall allow proper placement of concrete. A tension bar may be anchored by bending it across the web at an angle of not less than 15 deg 31-892 the longitudinal portion of the bar and making it continuous with the reinforcement on the opposite face of the member.
If concrete surfaces after removal of the forms are to be ex- posed to the weather or be in contact with the ground, the reinforce- ment shall be protected with not less ack 2 in. Where previous data are not available, concrete trial mixtures having proportions and consistency suitable for the work shall be made using at least three different water-cement ratios or cement content in the case of lightweight 381-92 which will produce a range of strengths encompassing those required for the work.
All piping and fittings shall be tested as a unit for leaks im- mediately prior to concreting.
These results may be achieved through many equally satisfactory methods. Items applying to working stress design only are indicated by acl page numbers Depending on the nature of subsequent use that is made, additional rights may need to be obtained independently of anything we can address.
The radius of gyration, r, may be taken equal to 0. If that occurs, the procedures of ACI should be emploved to determine if the average strength being sup- plied is adequately in 3189-2 of the specified strength.
Concrete—A mixture of portland cement, fine aggregate, coarse aggre- gate, and water. Bars shall be spaced approximately uniformly across each panel strip, except: Slip at anchorage 2. Three methods which have been used extensively with satisfactory results are given in this appendix.
Compressive strength shall be determined by tests of standard 6 x in. Slabs with recesses or pockets made by permanent or re- movable fillers between reinforcing bars may be considered flat slabs. The reinforced concrete portion shall be designed to carry all loads imposed between metal core brackets or connections at a stress of not more than 0.
ACI 318: Building Code Requirements for Reinforced Concrete
Column—An upright compression member the length of which ex- ceeds three times its least lateral dimension. Welded wire fabric with welded intersections not farther apart than 38-92 in.
Where the ratio of short to long span is less than 0.