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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The concret- ing shall be carried on at such a rate that the concrete is at all times plastic and flows readily into the spaces between the bars. The end of a column shall be considered hinged in a plane if in that plane r’ see Section exceeds Where more than one-half of the bars are spliced within a length of 40 bar diameters or where splices are made at points of maximum stress, special precautions shall be taken, such as increased length of lap and the use of spirals or closely-spaced stirrups around and for the length of the splice.
The temperature of the liquid, gas, or vapor shall not exceed F. Account shall be taken of any recesses which reduce the compressive area.
The spacing for the remainder of the column strip may vary uniformly from that required for a or b to that required for the middle strip. At cracked sections, the ability of the concrete to resist tension is neglected.
The effects of creep, shrinkage, and temperature need not be considered except in un- usual cases. For negative moments and shears, w is the total dead load plus live load for use in Table 1.
Building Code Requirements for Structural Concrete and Commentary (ACI 318-08, ISO 19338:2007)
American Concrete Institute, A middle strip one-half panel in width, symmetrical about panel center line. In deter- mining the spacing of the reinforcement in the column strip, the mo- ment may be assumed to vary from a maximum at the edge of the middle strip to a minimum at 3189-2 edge of the panel.
Shear reinforcement consisting of bars, rods or wires shall not be considered effective in members with a total thickness of less than 10 in. These friction losses shall be calcu- lated: When a section is controlled by tension, and has reinforce- ment in one or two faces, each parallel to the axis of bending, and all the reinforcement in any one face is located at approximately the same distance from the axis of bending, the ultimate strength shall not exceed that computed by: Rate and method of placing concrete 2.
Approved positive con- nections for bars designed to carry critical tension or compression shall be equivalent in strength to an approved welded splice. In any area common to one column strip and one middle strip, openings may interrupt one-quarter of the bars in either strip.
Combination column—A column in which a structural steel member, designed to carry the principal part of the load, is encased 138-92 concrete of such quality and in such manner that the remaining load may be allowed thereon.
Splices 3188-92 wires stressed at not more than one-half the per- missible stress shall be so made that the overlap measured between outermost cross wires is not less than 2 in.
The capacity of the column through the floor system shall be computed using the weaker concrete strength and adding ver- tical dowels and spirals as required.
The structure shall show no evidence of failure in the adi, and the recovery of deflection caused by the second test load shall be at least 75 percent. This moment shall be divided between the columns immediately axi and below the floor or roof line under consideration in direct proportion to their stiffness and shall be applied without further reduction to the critical sections of the columns, c Determination of “c” effective support size 1.
Loads on ground or on previously-placed structure — Removal of forms a No construction loads exceeding the structural design loads shall be supported upon any unshored portion of the structure under con- struction. Metal ties or spirals so designed shall be placed near not more than eight bar diameters from the point of bend. Specimens made to check the adequacy of the proportions for strength of concrete or as a basis for acceptance of concrete shall sci made and laboratory-cured in accordance with “Method of 3188-92 and Curing Concrete Compression and Flexure Qci Speci- mens in the Field” ASTM C ACI Year Index,pp.
The amounts of longitudinal reinforcement and the requirements as to spac- ing of bars, details of splices and thickness of protective shell outside Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on The fraction fcx shall be taken as 0. Elongation requirements shall be taken from aver- age load-elongation curves for the steel used. Halfway between the face of the column or pedestal and the edge of the metallic base, for footings under metallic bases c 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.
Shrinkage of concrete 5. This reinforcement shall be designed to carry the load on the portion of the slab required for the flange of the T-beam. The value of c for the span where a bracket is used shall be taken as twice the distance from the center of the column to a point where the bracket is IV2 in.
The test load shall not be applied 318–92 the structural members to be tested have borne the full service dead load for at least 48 hr. A curve shall be established showing the relationship between water-cement ratio or cement content and compressive strength. Design of tension reinforcement shall not be based on a yield strength, fy, in excess of 60, psi unless tests are made in com- pliance with Section b.
Stresses vary as the distance from the neutral axis except for deep beams Sec- tion Where previous data 31-892 not available, concrete trial mixtures having proportions and consistency suitable for the work shall be made using at least 3189-2 different water-cement ratios or cement content in the case of lightweight aggregates which will sci a range of 318-29 encompassing those required for the work. Concrete, structural lightweight — A concrete containing lightweight aggregate conforming to Section Provision shall be made for transfer of shear and other forces through the construction joint.
Full text of “ACI Building Code Requirements for Reinforced Concrete”
This reinforcement shall be pro- vided for a distance in each direction from the corner equal to one-fifth 38-92 longest span. Where lapped splices are used, the minimum amount of lap shall be: Bars in a bundle shall terminate at different points with at least 40 bar diameters stagger unless all of the bars end in a support. Three adi which have been used extensively with satisfactory results are given in this appendix. The bending moments may be determined approximately by using an equivalent qci load per lineal foot of beam for each panel sup- ported as follows: A two-way slab shall be considered as consisting of strips in each direction as follows: Reinforced concrete—Concrete containing reinforcement and designed on the assumption that the two materials act together in resisting forces.