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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Splitting tensile strength— see Section Stress—Intensity of force per unit area.
318-08: Building Code Requirements for Structural Concrete and Commentary
Longitudinal location of bends and ends of bars: Deflection, camber, eccentricity, and uplift 5. The values of coefficients assumed for design, and the acceptable ranges of jacking forces and steel elonga- tions shall cai shown on the plans. In bars required for compression only, the compressive stress may be transmitted by bearing of square-cut ends held in acl contact by a suitably welded sleeve or mechanical device.
These results may be achieved through many equally satisfactory methods. Transfer — The operation of transferring the tendon force to the con- crete. Spiral reinforcement shall conform to Eq.
Building Code Requirements for Structural Concrete and Commentary
Since this primary objective has been achieved by a combined membership effort. In such case, the allowable load, the gross area adi, and the required percentages of reinforcement shall be taken as those of the circular column. Identification marks shall be reproduced from the placing plans. The strength at transfer shall be adequate for the require- ments of the anchorages or of transfer through bond as well as meet camber 31-810 deflection requirements. In a composite member fVc will be the 3188-10 compressive stress at the centroid of the composite section, or at the 31810 of the web and flange when the centroid lies within the flange, due to both prestress and to the bending moments resisted by the precast member acting alone.
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 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. The strength tests shall be made at 28 days or the earlier age at which the concrete is to receive load, as indicated on the plans.
The Commentary is provided for this purpose. The assumptions made shall be consistent throughout the analysis. Members, not exposed to freezing ac nor to a corrosive qci, which contain bonded prestressed or unprestressed reinforcement located so as to control These values may be exceeded when not detrimental to proper structural behavior as provided in Section The total thickness, t2, in inches, of slabs with drop panels, at points beyond the drop panel shall be at least 4. The center to center spacing of reinforcement shall be not more than three times the slab thickness and the ratio of wci in each direction shall be not less than required by Section These requirements shall sci apply to compression reinforcement.
Web reinforce- ment between the face of the support and the section at a distance d therefrom shall be the same as required at that section. The calculated lateral force moments from wind or earth- quake may be combined with the critical moments as determined by the empirical method, and the lateral force moments shall be distributed between the column and middle strips in the same pro- portions as specified for the negative moments in the strips for structures not exceeding ft high with maximum story height not exceeding 12 ft 6 in.
The remainder of the reinforcement shall be uniformly dis- tributed in the outer portions of the footing. Pavements, pipes, and zci tanks are not included.
Jacking force — The temporary force exerted by the device which in- troduces the tension into the tendons. Test results showing the adequacy of such devices must be presented. Such struts shall be of adequate dimensions and anchorage to restrain the column against lateral deflection. Click here to sign up. The capacity of the column through the floor system shall be computed using the weaker concrete strength and 318-01 ver- tical dowels and spirals as required.
Tension reinforcement shall be well distributed in the zones of maximum concrete tension and in the flange of T-beams. At least 50 percent of the required negative reinforce- ment in the column strip shall cross the drop panel, if any.
In columns restrained laterally by struts or beams, with brackets used at the junction, it shall be the clear distance between acci floor 3318-10 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. When the negative moments are assigned to the composite section, adequate pro- vision for shear transfer must be made throughout the full length of the beam.
Full text of “ACI Building Code Requirements for Reinforced Concrete”
A semicircular turn plus an extension of at least four bar diameters but not less than 2Vz in. Where the ratio of short to long span is less than 0.
Reinforcement—Material that conforms to Sectionexcluding prestressing steel unless specifically included. Unbonded tendons are free to move rela- tive to the surrounding concrete.