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Grolabar Where no capital is used, the face of the column shall be con- sidered as the edge of the capital. The simplified design equations given in Chapters 16 and 19 are satisfactory. The calculated lateral force moments from wind or earth- quake may be combined with the critical moments as determined by the cai 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.
Building official—See Section c. Service live load—The live load specified by the general building code of which this code forms a part. 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. A clearance of at least 3 in. 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.
Where a column is without a concrete capital, the dimension c shall be taken as that of the column in the direction considered. Flat slabs within the limitations wci Sectionwhen designed by elastic analysis, may have resulting analytical moments reduced in such qci that the nu- merical sum of the positive and average negative bending moments Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on ACI Year Index,pp.
CIRIA C PDF In exterior panels, except for bottom bars adequately an- chored in the drop panel, all positive reinforcement perpendicular to the discontinuous edge shall extend to the edge of the aaci and have embedment, straight or hooked, of at least in. The shear stress, vc, permitted on an unreinforced web in Sec- tion c shall be 0. If the number of tests is small, there may be more than the indicated permissive percentage below the specified strength even though the average strength and the uniformity of the concrete are satisfactory.
Welded wire fabric with welded intersections not farther apart than 12 in. A column strip consisting of the two adjacent quarter-panels, one each side of the column center line. Unbonded steel shall be per- manently protected from corrosion. When mechanical anchorages are not provided and the contact surface is rough and clean 40 psi 2.
Halfway between the face of the column or pedestal and the edge of the metallic base, for footings under metallic bases c The width resisting compression at any section shall be assumed as the entire width of the top of the afi at the section under con- sideration.
Spiral reinforcement shall conform to Eq. For design purposes, any of these percentages may be varied by not more than axi percent of its value, but their sum for the full panel width shall not be reduced. Plain concrete—Concrete that does not conform to the definition for reinforced concrete. Building Code Requirements for Structural Plain Concrete Aci The tension reinforcement is replaced in design computations with a concrete tension area equal to n times that of the rein- forcing steel.
Bends for all other bars shall radii on the inside of the bar not less than the values of Table b. In T-shaped sections allowance shall be made for the effect of flange. Jacking force — The temporary force exerted axi the device which in- troduces the tension into the tendons.
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: Shear reinforcement consisting of bars, rods or wire shall not be considered effective in members with a total thickness of less than 10 in.
Where column capitals are used, the value of c shall be taken as the diameter of the cone described in Section b measured at the bottom of the slab or drop panel. Solid or ribbed slabs with clear spans of not more than 10 ft that are built integrally with their supports may be designed as continuous slabs on knife edge supports with spans equal to the Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on Slabs with recesses or pockets made by permanent afi re- movable fillers between reinforcing bars may be considered flat slabs.
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.
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JoJogore Calcium chloride or an admixture containing calcium chloride shall not be used. Where slabs are thus analyzed separate- ly, it may be assumed in determining the bending at a given sup- port that the slab is fixed at any support two panels distant there- from provided the slab continues beyond that point. Rate and method of placing concrete 2. At least 50 percent of the required negative reinforce- ment afi the column strip shall cross the drop panel, if any.
ACI 318-92 PDF
Vitaur Cai the column base, provision shall be made to transfer the load to the footing at safe unit stresses in accordance with Section a. Aggregate—Inert material which is mixed with portland cement and water to produce concrete. Available soon, it will aid the design of structural members by ultimate strength methods compatible with the Building Code. Web reinforcement shall be anchored at both ends in accordance with Section Flat slabs within the limitations of Sectionwhen designed by elastic analysis, may have resulting analytical moments reduced in such proportion that the nu- merical sum of the positive and average negative bending moments Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on The reinforcement in the bottom of the slab shall be at right angles to the diagonal or may be of Generated for Acj Aly Abdel-razik Moustafa University of California, Berkeley on In T-shaped sections allowance shall be made for the effect of flange. These requirements shall not apply to compression reinforcement. ACI Building Code Requirements for Reinforced Concrete 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.