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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In a composite member fVc will be the resultant compressive stress at the centroid of the composite section, or at the junction 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. In flat slab construction, it shall be the clear distance between the floor and the lower extremity of the capital, the drop panel or the slab, whichever is least.
Jacking force — The temporary force exerted by the device which in- troduces the tension into the tendons. Special brackets shall be used to receive the entire floor load at each floor level. The fraction fcx shall be taken as 0. These friction losses shall be calcu- lated: Where metal column capitals are used, account may be taken of their contributions to stiffness and resistance to bending and shear.
Elongation requirements shall be taken from aver- age load-elongation curves for the steel used. 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.
ACI 318: Building Code Requirements for Reinforced Concrete
When additional vertical ties are 318–92 the allowable bond stress on a rough surface may be increased at the rate of 3188-92 psi for each additional area of steel ties equal to 1 percent of the con- tact area.
For intermediate positions of the pile center, the portion of the pile reaction to be assumed as producing shear on the section shall be based on straight-line interpolation between full value at 6 in.
Two-way action existing for the slab or footing, with potential diagonal cracking along the surface of a truncated cone or pyramid around the concentrated load or reaction. Plain bar—Reinforcement that does not conform to the definition of deformed bar.
At least two spacers shall be used for spirals 20 acj. The values of coefficients assumed for design, and the acceptable ranges of jacking forces and steel elonga- tions shall be shown on the plans. In addition to the foregoing, vertical joints shall be thoroughly wetted, and slushed with a coat of neat cement grout immediately before placing of new concrete.
Where a joint is to be made, 318-992 surface of the concrete shall be thoroughly cleaned and all laitance removed.
Its 17 chapters cover properties, design data, design tables, and useful suggestions on construction. Cai stirrups so required shall be 318-922 into the cast-in-place slab, where their area may also be relied upon to provide some or all of the vertical tie steel required in c. Help Center Find new research papers in: When minimum steel tie requirements of c are fol- lowed and the contact surface is rough and clean psi 4. These methods of design are to implement the pro- visions of Section Welded wire fabric with welded intersections not farther apart than 12 in.
Subject to limitations of Section c 4, the thickness of a flat slab and the size and thickness of the drop panel, where used, shall be 318–92 that the compression due to bending at any section, and the shear about the 3189-2, column capital, and drop panel shall not exceed those permitted in Part IV-A or Part IV-B. The steel takes all the tension due to flexure. A middle strip one-half panel in width, symmetrical about panel center line and extending through the panel in the direction in which moments are considered.
All columns supporting flat slabs shall be designed as pro- vided in Chapter 14 or 19 with the additional requirements of this chapter. These rules when approved by the Building Official and promulgated shall be of the same force and effect as the provisions of this code. Elastic shortening of concrete 3. Slip at anchorage 2. Concrete, structural lightweight — A concrete containing lightweight aggregate conforming to Section At the column base, provision shall be made to transfer the load to the footing at safe unit acii in accordance with Section a.
Twenty-four 6 x in. Pedestal—An upright compression member whose height does not exceed three times its average least lateral dimension. The reinforcement in the top of the slab shall be parallel to the diagonal from the corner.
Bars shall be spaced approximately uniformly across each panel strip, except: After 7 days moist curing followed by 21 days drying acl 73 F and 50 percent relative humidity, eight of ai test cylinders at each of the two strength levels shall be tested for splitting strength and four for compressive strength.
Variation in the moments of inertia of the slabs and columns along their axes shall be taken into account. Beams, girders, brackets, column capitals, and haunches shall be considered as part 38-92 the floor system and shall be placed mono- 31-892 therewith. A column strip one-half panel in width, occupying the two quar- ter-panel areas outside the middle strip. Such stirrups or ties shall be used throughout the distance where the compression reinforcement is required.
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.
Full text of “ACI Building Code Requirements for Reinforced Concrete”
Available soon, it will aid the design of structural members by ultimate strength methods compatible with the Building Code. Admixture—A material other than portland cement, aggregate, or water added to concrete to modify its properties. 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 Drain pipes and other piping designed for pressures of not more than 1 psi above atmospheric pressure need not be tested as required in 3.
Surface water—Water carried by an aggregate except that held by absorption within the aggregate particles themselves. The average of the values of c at the two supports at the ends of a column strip shall be used to evaluate the slab thickness U or t2 as prescribed in d. Effective area of concrete—The area of a section which lies between the centroid of the tension reinforcement and the compression face of the flexural member. The minimum dimension of any column shall be as deter- mined by a and b below, but in no case less than 10 in.
Account shall be taken of any recesses which reduce the compressive area. Longitudinal bars bent so that the axis of the bent bar makes an angle of 30 deg or more with the axis of the longitudinal portion of the bar 4. This Board shall be composed of competent engineers and shall have the authority to investigate the data so submitted, to require tests, and to formulate rules governing the design and construction of such sys- tems to meet the intent of this code.
Longitudinal location of bends and ends of bars: Sea water shall not be used. Critical sections for moment calculations are located as follows: FOOTINGS g In sloped or stepped footings, the supporting area for bearing may avi taken as the top horizontal surface of the footing, or assumed as the area of the lower base of the largest frustum of a pyramid or 318–92 contained wholly within the footing and having for its upper base the area actually loaded, and having side slopes of one vertical to two horizontal.