The Reorganized ACI 14 Code. – Are You Ready? Neal S. Anderson, P.E., S.E.. Staff Consultant. Simpson Gumpertz & Heger, Chicago, Illinois. The American Concrete Institute (ACI) has pub- lished Building Code Requirements for Struc- tural Concrete (ACI ) and Commentary. /R ACI Building Code and Commentary. PREFACE. The code portion of this document covers the design and construction of structural concrete .
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Spiral reinforcement shall conform to Eq. The reinforcing spiral shall extend from the floor level in any story or from the top of the footing to the level of the lowest horizontal reinforcement in the slab, drop panel, or beam above.
Calcium chloride or an admixture 381-10 calcium chloride shall not be used. In the area common to two column strips, not more than one-eighth of the width of strip in any span shall be interrupted by openings. The top surface shall be generally level.
No frozen materials or materials containing ice shall be used. These drawings, details, and specifications shall show the size and position of all structural elements and reinforcing steel; pro- vision for dimensional changes resulting from creep, shrinkage, and temperature; the specified strength of the concrete at stated ages; the specified strength of the reinforcing steel; the magnitude and location of prestressing forces; and the live load used in the design.
The numerical sum of the positive and negative bending moments in the direction of either side of a rectangular panel shall be assumed as not less than in which F — 1.
Tables cover a wide range of working stresses. Tension in the precompressed tension zone: Such bars shall avi at least 24 in. For a listing of and access to all product errata, visit the Errata page.
Account shall be taken of any recesses which reduce the compressive area. Where longitudinal bars are offset at a splice, the slope of the inclined portion of the bar with the axis of the column shall not exceed 1 in 6, and the portions of the bar above and below the Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on One layer zci of not less than one- half and not more than two-thirds the total required shall be placed not less than 2 in.
The shear at sections between the face of the support and the section a distance, d, therefrom shall not be considered critical.
Building Code Requirements for Structural Concrete and Commentary
If that occurs, the procedures of ACI should be emploved to determine if the average strength being sup- plied is adequately in excess of the specified strength. Welded splices or other positive connections may be used instead of lapped splices. Enter the email address you signed up with and we’ll email you a reset link. The temperature of the liquid, gas, or vapor shall not exceed F. These results may be achieved through many equally satisfactory methods.
In columns restrained laterally by struts or beams, with brackets used at the ac, it shall be the clear distance between the floor and the lower edge of the bracket, provided that the bracket width equals that of the beam or strut and is at least half that of the column. Precast concrete—A plain or reinforced concrete element cast in other than its final position in the structure.
In concrete joist floors in which the clear distance between joists is not more than 30 in.
Transfer — The operation of transferring the tendon force to the con- crete. This case shall be considered in accordance with Section Transfer of loads to the metal core shall be provided for by the use of bearing members such as billets, brackets, or other positive connec- tions; these shall be provided at the top of the metal core and at in- termediate floor levels where required. Offset bars shall be bent before they are placed in the forms. A column strip consisting of the two adjacent quarter-panels, one each side of the column center line.
The Code is written in a format that allows such reference without change to its language. 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 axi is located at approximately the same distance from the axis of bending, the ultimate strength shall not exceed that computed by: Where the exterior supports provide only negligible restraint to the slab, the 31810 of tx and t2 for the exterior panel shall be increased by at least 15 percent.
Deflection of mem- bers due to the prestressing force and deformation of falsework shall be considered in the design. In tied columns the amount of reinforcement spliced by lap- ping shall not exceed a steel ratio of 0. Values of x r T 0. Tension reinforcement shall be well distributed in the zones of maximum concrete tension and in the flange of T-beams.
The assumptions made shall be consistent throughout the analysis.
All piping and fittings shall be tested as a unit for leaks im- mediately prior to concreting. Pretensioning tendons immediately after transfer, or posttensioning tendons immediately after anchoring A curve shall be established showing the relationship between water-cement ratio or cement content and compressive strength.
The shear stresses at sections between the face of the support and the sec- tion a distance d therefrom shall not be considered critical. 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. Reinforced concrete bearing walls of two-story dwellings may be 6 in. Where information for the determination of fsH is not avail- able, and provided that fse is not less than 0.
Full text of “ACI Building Code Requirements for Reinforced Concrete”
The effects of creep, shrinkage, axial deformation, restraint of attached structural elements, and foundation settlement shall be considered in the design. The metal cores shall be designed to carry safely any construction or other loads to be placed upon them prior to their encasement in concrete. Portions exposed above grade shall, in addition, be reinforced with not less than the amount specified in Section Plain bar—Reinforcement that does not conform to the definition of deformed bar.
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 At least 25 percent of required negative reinforcement in the column strip shall cross the periphery located at a distance of d from the column or column capital.
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 Resistance to bending moments at any floor level shall be provided by distributing the moment between the columns immediately above and below the given floor in proportion to their relative stiffnesses and conditions of restraint.
318-08: Building Code Requirements for Structural Concrete and Commentary
The slab or footing acting essentially as a wide beam, with a potential diagonal crack extending in a plane across the entire width. The ties shall be so arranged that every corner and alternate ac bar shall have lateral support provided by the corner of a tie having an included angle of not more than deg and no bar shall be farther than 6 in.
Pavements, pipes, and circular tanks are not included. For negative moments and shears, w is the total dead load 3181-0 live load for use in Table 1.