minimum reinforcement for slab on grade

"How to Specify, Order and Use Welded Wire Reinforcement… The temperature reinforcement shall not be less than ½ inch at nine 9 inch center to center. Where a grade of steel other than D500N (deformed bars, grade prefixed by a grade designation 500 steel, normal ductility) is required, the size of bar should be Bar structural properties (default grade is D500N) A8 14-D250N12-S-300 A8 14-R12-S-300 (for plain round reinforcing bar, Grade 250N) If the slab is 5 inches thick or less, then position the steel at mid-depth. The bottom layer reinforcement due to tension at the bottom of the slab indicates that the minimum reinforcement of 0.13 in2/ft is adequate for most of the slab except for an area of 2’-0” x 2’-0” under the posts. W for round reinforcing bar, Grade 500L 5. the reinforcing required. The required amount of reinforcement for an area 2’-0” x 2’-0” under the post is the envelope of Asx(T) and Asx(B) S min = 0.0018 (for f y = 60,000 psi). During the placing of the reinforcement, it is advised to place the reinforcement bars closer to the surface of the slab top surface without compromising the minimum concrete coverage over the reinforcement. In this one-way slab, restraint of movement by the stair towers might require the area of shrinkage and temperature reinforcement to be twice as great as the minimum area required by Section 7.12.2.1 of ACI 318-02. A minimum steel ratio of 0.5% of the slab cross section is recommended so that the saw cut of contraction joints can be eliminated. For a precast reinforced concrete slab, the minimum cover required is ⅝-inch for #11 bar and lower. RE: Minimum reinf. In calculating the actual I of the slab, the sections shown in Figure 11 should be used. For a cast-in-place concrete slab, this sits around ¾-inch. The minimum ratio of required reinforcement is; FOR SLABS: f min = 0.002 (for f y = 40,000 psi). You cannot achieve this thin level of concrete when exposed to the weather or in contact with the ground. Reinforcing has to be supported so that it is in the top 1/2 to 1/3 of the depth of the slab throughout the pour. for slab-on-grade kslee2006 (Structural) 2 May 06 12:52 The hair-pin design is valid only when the column is supported directly on top of the pedestal of the footing, which in turn is seperated from the slab-on-grade through expansion joint. Steel reinforcement is available in Grade 40 or Grade 60; the grade number refers to the minimum tensile yield strength of the steel (Grade 40 is minimum 40 ksi steel and Grade 60 is minimum 60 ksi steel). For most slabs on grade, position the reinforcement at one-third the depth from the top surface. Finally, the IRC doesn’t show this in the code section, but you may need insulation under the slab, that is verified with the IECC. As can be seen, the exterior beams can be deepened, or all beams can be deepened. Page 5 • TF 700-R-03 The ground slab is for a storage facility with moving forklifts. FOR WALLS: For Vertical Steel. Supporting reinforcement Since positioning of reinforcement is critical, support devices must be used to What is the minimum overlap/splice length for reinforcement in a slab-on-grade? Without the extra reinforcement, width of cracks perpendicular to … f min = 0.0025. Assume we have a 200mm thick ground slab reinforced with 12mm @ 200 c.c both ways. Either grade may be used for residential construction; however, most reinforcement in the U.S. market today is Grade 60. "Supports Are Needed for Long-Term Performance of Welded Wire Reinforcement in Slab-on-grade" (TF 702-R-08) WRI Tech Facts. 7.3—Reinforcement for crack-width control only 7.4—Reinforcement for moment capacity 7.5—Reinforcement location Chapter 8—Design of shrinkage-compensating concrete slabs, p. 360R-32 8.1—Introduction 8.2—Thickness determination 8.3—Reinforcement 8.4—Other considerations Chapter 9—Design of post-tensioned slabs-on-ground, p. 360R-36 For Horizontal Steel. It is felt that deeper exterior beams are more effective, but as long as the slab is kept symmetrical it does not seem to matter. f min = 0.0015.

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