ACI 318-92 PDF
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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Offset bars shall be bent before they are placed in the forms. A complete publications catalog is available from ACI Headquarters free of charge.
Concrete—A mixture of portland cement, fine aggregate, coarse aggre- gate, and water. A two-way slab shall be considered as consisting of strips in each direction as follows: One layer consisting of not less than one- half and not more than two-thirds the total required shall be placed not less than 2 in.
Concrete, structural lightweight — A concrete containing lightweight aggregate conforming to Section In columns restrained laterally by struts, it shall be the clear distance between consecutive struts in each vertical plane; provided that to be an adequate support, two such struts shall meet the column at approximately the same level, and the angle between vertical planes through the struts shall not vary more than aic deg from a right angle.
Investigation may be restricted to those cross 31-92 nearest each end of the member that are required to develop their ultimate strength under the specified ultimate load.
The area of reinforcement shall be determined from the bend- ing moments at the critical sections but shall be not less than re- quired by Section Slabs with paneled ceilings may be considered as flat slabs provided the panel of reduced thickness lies entirely within the area of inter- secting middle strips, and is at least two-thirds the thickness of the re- Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on Tension reinforcement shall be well distributed 318-9 the zones of maximum concrete acl and in the flange of T-beams.
Charts cover a wide range of concrete and steel strengths. ACI Year Index,pp. The effects of creep, shrinkage, axial deformation, 318-922 of attached structural elements, and foundation settlement shall be considered in the design. Splitting tensile strength— see Section Stress—Intensity of force per unit area.
When the specified yield point of the tension reinforcement exceeds 40, psi, beams designed on the basis of ultimate strength should always be built with shores unless provisions are made to prevent excessive ai cracking. The slab or footing in this case shall be designed as specified in the remainder of this section.
Building Code Requirements for Structural Concrete and Commentary (ACI 318-08, ISO 19338:2007)
The bents shall be taken longitudinally and transversely of the building. A yield strength in excess of 60, psi shall not be considered for shear reinforcement.
The equivalent of the bars so interrupted shall be provided by extra steel on all sides of the opening. The wire of the welded fabric wci be of not less than No. This fabric shall extend entirely around the column at a distance of 1 in.
For spans discontinuous at both ends, g or gi shall be taken as unity. The mini- mum size of bar shall be 5. Construction failing to show 75 percent recovery of the deflec- tion may be retested. No construction load shall be supported upon, nor any shoring removed from any part of the structure under construction until that portion of the structure has attained sufficient strength to support safely its weight and the loads placed thereon.
It is possible that heirs or the estate of the authors of individual portions of the work, such as illustrations, assert copyrights over these portions. For negative moment, along the edges of the panel at the ai of the supporting beams. The minimum number of bars shall be six for spiral columns and four for tied columns.
Full text of “ACI Building Code Requirements for Reinforced Concrete”
A middle strip one-half panel in width, symmetrical about panel center line. Users are free to copy, 318-2, and redistribute the work in part or in whole. In com- puting moments in columns due to gravity loading, the far ends of columns which are monolithic with the structure may be considered Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on At a noncontinuous edge the area of negative moment rein- forcement per unit width shall be at least one-half of that required Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on Web reinforcement shall be anchored at both ends in accordance with Section 3318-92 Concrete 318-29, The live load may be considered to be applied only to the floor or roof under consideration, and the far ends of the columns may be assumed as fixed.
Critical sections occur at the face of the support, at each point where tension bars terminate within a span, and at the point of inflection. In flanged members, if the centroidal axis is not in the web, the principal tensile stress should be determined at the intersection of the flange and the web.
In bars required for compression only, the compressive stress may be transmitted by bearing of square-cut ends held in concentric contact by a suitably welded sleeve or mechanical device.
Additional tests may be made at earlier ages to obtain ad- vance information on the adequacy of strength development where age-strength relationships have been established for the materials and proportions used.