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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This is satisfied when: Within these limitations, columns may be offset a maximum of 10 percent of the span, in direction of the offset, from either axis between cen- ter lines of successive columns. Cross grain compression 8.
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: For design purposes, any of the moments determined from Table f may be varied by not more than 10 percent, but the numerical sum of the positive and negative moments in a Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on All concrete materials and all reinforcement, forms, fillers, and ground with which the concrete is to come in contact shall be free from frost.
Calcium chloride shall not be used.
Full text of “ACI Building Code Requirements for Reinforced Concrete”
A clearance of at least 3 in. The pressure test shall be held for 4 hr with no drop in pressure except that which may be caused by air temperature. The minimum horizontal and vertical reinforcement in the faces shall be as in Section f ; the minimum tensile rein- forcement as in Section Items applying to working stress design only are indicated by italic page numbers The spacing of the bars shall not exceed five times the thickness of the flange, nor in any case 18 in.
Columns smaller than required by Eq.
The equivalent of all bars interrupted shall be pro- vided by extra steel on all sides of the openings. A deg turn plus an extension of at least 12 bar diameters at the free end of the bar, or Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on Except in anchorage regions, strain in reinforcing bars shall 318-922 assumed equal to the strain in the concrete at the same position. Any opening larger than described above shall be analyzed by accepted engineering principles and shall ack completely framed as required to carry the loads to the columns.
Twenty-four 6 x in. Approved positive con- nections for bars designed to carry critical tension or compression shall be equivalent in strength to an approved welded splice. Such struts shall be of adequate dimensions and anchorage to restrain the column against lateral deflection. Where a joint is to be made, the surface of the concrete shall be thoroughly cleaned and all laitance 31-892.
Screw connections shall be prohibited. 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. For determining reinforcement, the thickness of the drop panel below the slab shall not be assumed to be more than one- fourth of the distance from the edge of the drop panel to the edge of the column capital.
Concrete—A mixture of ack cement, fine aggregate, coarse aggre- gate, and water. Shear reinforcement consisting of bars, rods or wires shall acu be considered effective in members with a total thickness of less than 10 in. They shall be properly braced or tied together so as to maintain position and shape. Aggregate—Inert material which is mixed with portland cement and water to produce concrete.
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. Any reasonable assumptions may be adopted for computing the relative flexural stiffness of columns, of walls, and of floor and roof systems.
ACI 318: Building Code Requirements for Reinforced Concrete
The assumptions made shall be consistent throughout the analysis. Elastic shortening of concrete 3.
Precast concrete—A plain or reinforced concrete element cast in other than its final position in the structure. 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 In such case, the allowable load, the gross area considered, and the required percentages of reinforcement shall be taken as those of the circular column.
Sleeves, pipes, or conduits of any material not harmful to concrete and within the limitations of this section may be embedded in the concrete with the approval of the engineer provided they are not considered to replace the displaced concrete.
The average shear stress shall satisfy the requirements of Chapter 12 or In calculations of section properties prior to bonding of ten- dons, areas of the open ducts shall be deducted. Combination column—A column in which a structural steel member, designed to carry the principal part of the load, is encased in concrete of such quality and in such manner that the remaining load may be allowed thereon. Creep of concrete 4. 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.
Combinations of 1 or 2 with 3 c Stirrups or other bars to be considered effective as web rein- forcement shall be anchored at both ends according to the provisions of Section The stirrups shall extend into the member a distance d from the compression face.
Effective vibration is commonly the most suitable means.