Some brands of forms have preformed chases that run the length of each. Minimum clear cover to reinforcements in slab depends on the. This is illustrated in Figure 1, where #5 bars are used in both the top (T) and bottom (B) layers in T wo-way slabs are generally defined as suspended slabs where the ratio of the long to the short side of a slab panel is 2 or less. However, this is the absolute minimum and applies only when there is no load on the concrete slab at all. The Rebar Calculator contains equations and data used in working with reinforcement bars (rebar) in concrete slabs. The lengths are in meters and centimeters, the areas are in square meters, the volumes are in cubic meters, and the weights are in kilograms and metric tons. Once you have determined that the foundation of the house is strong enough to sustain a concrete floor, lay down wood sheeting. A rebar slab calculator is a tool used to determine the quantity and spacing of reinforcing bars (rebars) needed in a concrete slab. and 6000 btu/hr heat loss in the second. The minimum shrinkage and temperature reinforcement shall be as per Table 4. REBAR SPACING: GP‐7 SERIES MODELS: 4‐1/​4" 3000 PSI / 28 Day Aging #6 Rebar:. 4, and No. 5 rebar, then measure and mark for your dowels at a 18. Wet your concrete after the pour. extension of existing reinforced concrete (R/C) structural elements such as slabs, walls, and columns (Figure 3), either to facilitate expansion of floor space or to address other functional changes in the use of the structure. 7736 m 2. Properly compacted sub-grades can reduce needs for reinforcement – as well. 0 pounds per cubic yard (0. Floor slabs can range from a simple residential basement slab to a heavy-duty industrial floor. 5 kPa), column spacing typically ranges from 15 to 25 ft (4. The reinforced concrete floor slab is kept free of the perimeter walls. Standard concrete floor slab thickness in residential construction is 4 inches, five to six inches is recommended if the concrete will receive occasional heavy loads, such as mortar homes or garbage trucks. The edge of the slab is usually thicker and acts as the footing for the walls. On average are required, for 100 square feet with 5 inches thick slab, 19 strips of 3/8” rods (30 ft each one), are 570 ft. 3: Two-way slabs supported on four sides; Clause 6. Concrete rebar calculator plan view diagram. Space joints (in feet) no more than 2-3 times the slab thickness (in inches). unless otherwise noted, all slabs on grade are to be reinforced with 10mm bars at 400mm o. 2L at the intermediate support. 5" of XPS foam board underneath, 1150 square feet, 7 feet below ground. Minimum thickness of concrete slab, beam, column, foundation and other structural members is selected to meet the design requirements as per standard codes. 2 Spacing s of transverse barsUse min 3/8 inch 24 inch on center rebar (wired together) not mesh. 1 Flexural Cracking in Reinforced-Concrete SlabsFor mid-depth rebar, the program will use the bottom bar size and spacing options. Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. 02 To control deflection, r. Many concrete slabs for homes, driveways, garages, and sidewalks are built according to standard thickness recommendations and do not require a specific. No, you do not need rebar for a 4-inch slab of concrete on grade. Step 1. The support for reinforcing steel in floor slabs is shown in figure 7-24. Number of Required Bars Formula = (Length of slab / spacing) + 1. Clear span of the two way slab = 5000 mm. Calculate how much rebar you need to reinforce a concrete slab. Contact*: Severity*: Description*:Problem #3 – Shrinkage cracks that allow moisture to reach the rebar. 1. Since this is a patio, you could use 6x6 10/10 wire mesh instead of the rebar. AI Homework Help. Floors shall be a minimum 3 1 / 2 inches (89 mm) thick (for expansive soils, see Section R403. UB 610 x 179_BP_Pinned. For this case, the lift should not be installed without written authorization from theIt has stood up to some really heavy equipment for 25 years. 1 can be used for these purposes. 15% of the slab’s cross-sectional area), the spacing of tendons in at least one direction shall not exceed the smaller of eight times the slab thickness and 1. 00 m 7 cantilever reinforced concrete beams 18 mm for every 3. ** For alternate steel schedules and/or slab thickness determine As (end area of steel, in2) as shown below and use USDA NRCS Standard Drawing ES-46 to select bar size = and spacing that meets or exceeds the computed end area of steel. For multi sided slab, first draw the shape: 1: Hit Clear + Start and enter Side Length of first side to draw, then hit appropriate direction (Arrow) button to draw. 3 Factored live load = 3. spacing requirements and to repeat bar size and spacing as often as possible. the slab joint spacing should be the same as for an un-reinforced slab. The shear reinforcements are provided from the support. The floor has been designed with two mats of steel, 7 1/2" total concrete thickness and 50 ksi steel beams with a single row of shear studs on the beams. Column spacings are 48 feet center to center. Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. ) slabs are plate elements used to form the floors of buildings. 40 (default) and 60 are common. For this case, the lift should not be. ~ INTRODUCTION Cold-formed steel deck sections are used in many composite floor slab applications wherein the steel deck serves not only as the form. Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. If the maximum diameter for slab thickness is 75 mm, so the diameter of reinforcing bars should be 8 mm. A flat plate floor with a live load of 100 psf is only about 8% more expensive than one with a live load of 50 psf, primarily due to the minimum thick-ness requirements for. Patio slabs are used in pathways. Minimum reinforcement is 0. , interior beam dimensions = 14 in. If shear reinforcement is required for in-plane strength, spacing of longitudinal reinforcement shall not exceed l w /5. Also, a small hole in the concrete will be totally fine, given the fact that there is a rebar grid. roof and floor inertia forces only. This calculator uses 35% of balanced rebar area as the steel area for design of slab. Heavy Loads. The two design options are a ground-bearing slab, or a pile supported suspended slab. Corner angle. 1) provides the code basis. The roof of a concrete home can be used as a slab-on-grade floor for the wood frame on the second story. For example, one-way slab thickness. STRENGTH REINFORCEMENT REBAR SPACING GP‐7 SERIES MODELS 4‐1/4” 3000 PSI / 28 Day Aging #6 Rebar 12 In. Elevated Slabs - Design. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos. c) Slab reinforcement percentage less than 0. 5” long, are typically dosed at the rate of 60-68 pounds per cubic yard. Lower composite deck-slab weight than 3WxH-36 for the specified concrete thickness 8 inch on center low flute spacing to allow for bearing wall studs to be at 16 inches on center Non-composite deck 7⁄ 8 inch depth, 32 inch coverage 2 foot to 7 foot Span Range No Acustadek® Options Good for short span conditions1. Download : Download high-res image (140KB)Others say rebar in the middle is a waste. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. The existing rebar spacing is @ 16 in. Once you input these values, you. My main building is 6" concrete with #4 rebar on a 6X6 grid. 1 Introduction: A structural member used for covering spaces in the form of roof or floor is called a slab. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. This slab will have rolling fork lift loads. MotorCity (Structural) 22 May 17 13:44. The structural design of the concrete floor slab on-ground is dominated by the sub-grade conditions and the floor loadings. 00 m 4 3. 76 Slab designation: CS1 Check if one-way or two-way slab 1 Slab is one way since it is catilever slab Minimum slab thickness min t = 69. 00 m 21 reinforced concrete slab 3 mm for every 3. Joint spacing that is greater than 15 feet require the use of load transfer devices (dowels or diamond plates). 10) Deflection and end-slip behavior. Generally, rebar has an immense impact on concrete. ACI 360, "Design of Slabs-on-Grade", refers to this as a Type B slab. last quarter of 2014, the prices i got for the rebars (12m lenght) are: 9mm deformed rebar - P110 10mm - P138 12mm - P205 16mm - P385. So, if we have used 12mm dia rebar in column maximum permissible spacing is 72mm and for 16mm dia longitudinal rebar the spacing is 96mm and so on. The typical depth for rebar placement for slabs is 2-4 inches. Concrete Slab Rebar Spacing Guideline Report an Issue. , edge beam dimensions = 14 in. For the footing, it usually comes between 16mm to 25mm dia depending upon the size of the footing and the reinforcement bar used in compression mesh. Assessing General Pier Spacing Requirements In addition to the type of soil or backfill, structural loads , and weather conditions, pier spacing specifications will depend on a few other factors, such as the square footage of the home, floor plan, location of any openings, types of piers used, whether the home has one or two stories, and. 8. Rebar (short for reinforcing bar ), known when massed as reinforcing steel or reinforcement steel, [1] is a steel bar used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension. And rebar is sized by eights of an inch. Commonly called “rebar,” these 1/2-inch-diameter steel rods are embedded in the center of the slab to create a grid that extends lengthwise and crosswise to help the concrete better resist pulling and bending forces. 3 Storey Building: Larger diameter rebars, such as 16mm and 20mm, may be used to accommodate the. 73 per square foot, with an average cost of $6. 5 m. 14 and No. 15 1-1 CHAPTER 1 INTRODUCTION 1-1. The concrete floor will be reinforced according to WAC 246-359-430. Matt, You need to tie the new footing and foundation wall into the existing structure's footing and foundation wall, so yes drill and epoxy the rebar in. 6. , edge beam dimensions = 14 in. T F 8. #5 rebar on a 6X6 grid, No cracks in that, poured the same time as the slab in the heated addition. Steel shall be located within 2” of the top or the upper 1/3 of the slab. C. Rebar steel will be calculated for the bending moments “Mx” and “My. For example in a slab of 6-inch depth, a rebar of 6/8 inch will be used. This steel runs vertically and should lap the same size reinforcing steel out of the footing. 1) for con-c r ete cover over re i n f o rc e m e n t h a v e not been consistent. There are many variables that influence the decision of how much space to leave, including the maximum load the slab is likely to. For example, one-way slab thickness. Grid length = Slab-length – (2 * edge-Rebar-spacing) The total length needed for Rebar is measured vertically and horizontally. One reason is simple ease of construction. C. Cutting length of main bar = Clear span of slab + (2 × Development Length) ( 2 × D e v e l o p m e n t L e n g t h) + Inclined Length - Bend Length. The formula is, Number of bars = (length ÷ spacing) + 1. If the slab is poured against an existing foundation wall or another slab, you would use the #4 or #5 rebar to dowel it to the which ever you are butting too. Drive a stake at the end. 3. 1. for early-entry sawed joints. SCI P300 is a comprehensive guide for the design and construction of composite slabs and beams using steel decking. ACI 318-08. Modeling floor diaphragms. To reinforce a 4” concrete slab or driveway with steel rebar, determine the grid spacing and rebar size – #3 or #4 in a 12” to 18” grid. 2 – Contraction joints, states the following: “ (d) Joint depth shall be a minimum of ¼ the slab thickness for formed or tooled joints, or dry-cut sawed joints in hardened concrete (e) Joint depth shall be a minimum of 1 in. Then, the new slab needs to be left alone. Its primary purpose is to increase the tensile strength of the concrete, helping it resist cracking and breaking. Generally, #4 rebar (1/2 inch in diameter) is the most common size used for slab on grade applications. 5 inches of spacing (18" + 1/2" diameter of the rebar). 87 d Spacing of bar = Design of Continuous Slab Suppose a slab is supported at the ends and also at intermediate points on beams, the maximum sagging and hogging moments to which the slab is subjected to due to uniformly distributed load, can be computed as follows: Let = intensity of dead load per square metre. Grade 40 means that the yield strength is 40,000 psi and the code allowed strength is 20,000 psi. make sure rebar is in the center of the slab, or close to it. I was thinking of the following: basement wall 8 inches thick 10 feet high backfilled up to 7 to 8 feet. The span is 2. ˘ ˘ˇSpacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. Selecting the correct type of rebar is as impor tant as the diamet er and grade. : Regarding reinforcement in slabs, please clarify whether you find a rebar spacing of 16 inches as good in reducing crack widths as a spacing of 6 or 8 inches, assuming there is the same total area of reinforcement in any case. A slab with this joint spacing may be reinforced with bars (ASTM A 615, A 616, A 617, or A 706) or WWF (ASTM A 185 or A 497). e. Avoid using air contents over 3% for interior slabs. With this calculator, you’re trying to calculate the dimensions of your rebar grid (length and width). A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. It requires input values for the dimensions of the slab, the size and spacing of rebars, and other parameters, providing an estimate of the required rebar quantities. of the most advantageous location for a floor opening depends on the type of two-way slab you’re designing or evaluating. 2. reinforcement for the bottom fibers of the composite slab. most of the time). It is possible to pour a concrete garage floor without installing rebar for reinforcement. Ch. Rebar Spacing. 8 ). The bracing comes out after curing. ÞArranged bars should be strong enough not to deflect when a person steps onmaximum spacing of reinforcement in both directions. Figure 1a: Joint Spacing in Meters. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. The slab will have 1/4" vinyl applied to the top, and we were thinking of casting the slab without control joints to prevent curling at the joints. These cracks have little impact on durability. f. That is, there are breaks in the rebar along the runs. Grads Slab/ Slab on grade: The slab which is cast on the surface of the earth is called a Ground slab. 64 mm) between longitudinal rebar 2 and 3, which is the same as the rebar construction and traditional tape measurement results. Steel reinforcement bar size for footing of G+1/ 2nd floor building:- we will assume a structure of G+1 (two storey) residential building, using standard 4″ thick walls, according to general thumb rule, use of mesh bar of 12mm or number 4 (#4) size (diameter) of steel reinforcement as main and distribution bar (T12@6″C/C of Fe500) is most. It may be desirable to tie and reinforce the new slab to the pre‐existing surrounding floor. Generally, for a standard residential foundation, the minimum spacing between rebar should be at least 4 inches. Unless you are going to park a very large truck on the slab the 2'x2' oc #4 rebar is over kill IMHO. SLAB REINFORCEMENT SIZE REINFORCEMENT SPACING ANCHOR ANCHOR Cutting that rebar ain’t going to do shit, despite all the “engineers” comments to the contrary. So, pathway slabs go under heavy loads continuously. I am confused about the grid. Part of the building is 2 storeys high. The more layers of rebar you have, the harder it becomes to properly vibrate the concrete. Concrete slabs-on-ground containing 6 × 6 W1. Tie the rebar together. Wire mesh is better then rebar, if it can be kept up off the bottom of the slab. Total Volume of concrete in cubic yards. The Rebar and Concrete in a Slab calculator computes the total length and weight of rebar and the volume of concrete needed for a slab. The size of the rebar depends on the specific application, but typically #4, #5, #6, and #8 rebar are used. Looking at the layout of the walls i think that the slab is 1 way spanning, but i would like to know what methods are available to check this. If too much water was. vided in the slab under the net. Suspended slab/Two-way slab/One-way slabToday's video answers the questions I get asked most frequently: - How do you read or interpret slab reinforcement pl. vapor retarders - some times referred to as vapor barriers, insulation, etc. However, no matter how basic or complex. 10%. 73 Therefore, use 12 mm bars @ 0. 1. It simply means it contains steel. 2 Storey Building: For increased load-bearing capacity, a mix of 12mm and 16mm rebars could be appropriate. An example is shown in Fig. Parking lots have most loads imposed on interior slabs sur-11. Fa b r ic may also be supported at the center of the slab, or it may be installed in two flat layers with the top layer (nega-t i v e steel) extending on either side of the support for one-quarter of the span (See Fi g u r e 1). REBAR SPACING: GP‐7 SERIES MODELS: 4‐1/ 4" 3000 PSI / 28 Day Aging #6 Rebar: 12 in: XPR‐9 SERIES MODELS: 4‐1/ 4" 3000 PSI / 28 Day Aging #6 Rebar:. Main bars in the slabs should not be less than 8 mm if you are using the H. This is illustrated in Figure 1, where #5 bars are used in both the top (T) and bottom (B) layers in T wo-way slabs are generally defined as suspended slabs where the ratio of the long to the short side of a slab panel is 2 or less. 3. , and unfactored live load = 100 psf. On average are required, for 10 square meter with 12cm thick slab, 19 strips of 3/8” rods (9ml each one), are 171 ml. 8 mm) when subjected to 50 pounds (23 kg) applied over 1 inch square (645 mm) of material and are greater than 1 / 8 inch (3. I have some question regarding the placement of the expansion joints. 530 m Therefore, gross area of building = 201. We’ll run through these ties now: Saddle ties:As per clause 11. reqd identifying no. #TwoWaySlab #Basic #ConstructionWatch Basic Concept with its Practical Application by Construction AnimationJoin as member to support the channel. For example, The #3 bar size is 3/8″ diameter of the solid section, the #4 bar size is 4/8″ diameter of the solid section, and the #5 bar size is 5/8″ diameter of the solid section. There's no generally-accepted rule of thumb as to how to space rebar in a concrete slab. b. And the rebar details of (1) is 10mmØ @ 8″ c/c. Round up the value of n to the next whole number to find the nominal rebar size required for that spacing. Concrete volume calculator plan view diagram. (1) ε = θ (h b + h s) L-L 1. 10mm, 12mm, 16mm, 20mm. If you are using high shrinkage concrete, you might want to decrease the cut spacing. 00 m span 3. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. The maximum spacing of temperature steel is the smaller of 5 times the slab thickness or 18 in. I'd use: 8" thick concrete wall with #6 rebar at 12" oc EACH WAY with the VERTICAL rebar placed 3/4" clear from the face of the INTERIOR BASEMENT ROOM. then use 1/2 PEX tubing and create about 5 floor heating circuits, bring all of them to a convenient access point in the shop. 42), the overhanging flanges of. ACI 330R-08, Guide for the Design and Construction of Concrete Parking Lots is. The term "composite steel deck floor slab" is applied to systems in which the steel deck has some mechanical means of providing positive interlocking between the deck and the concrete. to 9. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. Finally, you pour the concrete into the molds. Here:Bar Tying Requirements. Install tie down 'J' bolts into the slab using a template of the base of the. Most homeowners can expect to pay between $4. The design and spacing of expan-sion and control joints is genera l l ysee table 3 for spacing. The procedure: Lay up the first 4-foot height of wall. Section 13. E. LIFT MODELS. Floor Under Solids or Semi- solids and Single Axle load (15,000 lbs. Essentially a early age concrete shrinkage problem (cement paste not reaching full strength/bond with aggregate and restraint on the concrete member due to rebar. But if the slab is a patio or driveway, it will need rebar. Because of this, the Building Code places limitations on the size and spacing of rebar in gunite & shotcrete. 5 Footing and slab construction. Welded wire. To maintain strength and longevity, concrete slab rebar spacing must fit together like a jigsaw puzzle. The maximum anchor bolt spacing shall be 4 feet (1219 mm) for buildings over two stories in height. One Way Slab Bar Bending Schedule Calculation. Concrete blocks made of sand-cement mortar can be used in place of the slab bolster. Make sure it is in the very center of the slab as if it is too close to the top or bottom it is also useless. Check ACI 360R-10 Guide to design or slabs on ground. c) Slab reinforcement percentage less than 0. To assign a Slab element to the floor, go to Assign>Wall/Slab/Deck sections. This design approach is sometimes referred to as continuously reinforced or joint-less slabs and allows numerous, closely spaced (3 to 6 feet), fine cracks to occur throughout the slab. Expert Guide to 2nd Floor. 2. com) 3. In either case, blocks should be used under the. 3 Welded wire reinforcement (with wire size not greater than MW30 or MD30) used in slabs not exceeding 3 m in span shall be permitted to be curved from a point near the top of slab over the. But as the depth grows, so does the need for reinforcing the structure. Now, divide each measurement by the 14-inch spacing. After pouring concrete walls, they are anywhere from 8 to 10 inches thick. Compression is a force that squeezes or crushes, and tension is a force that pulls something apart. b) Slab depth does not exceed 200 mm when the steel grade is 460. ) = 0. For building footings I would use a #5 (5/8 inch) rebar. Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the. 15% for mild steel bars. ) 400 dowel 400 250 %$56 $6 6+2:1 %277 %$56 # 2 & slab occurs mid-depth of slab [ /21* $7 723 bott. 4 size rebar (½ in. How far apart should rebar be spaced? approximately 12 inches Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. Most residential slabs contain reinforcement of less than. Clause 6. My understanding of slabs based on limited experience and a heck of a lot of reading here is:1. in concrete slabs. (not reducing for cover/spacing, etc. 5 bar or two No. Two layers of steel bar reinforcement are needed for secondary containment floors because tank loads induce both positive and negative bending moments in the floor. 4. 5 kPa), column spacing typicallyRepeat this process until you’ve laid all the necessary rebar. 6) Calculation of top rebar Please refer to the method in construction site as follows because it is very difficult to explain in theory. rebar strength is in tension, so by adding rebar to BOTTOM of foundation, it counter acts the load of compression. How far apart must rebars normally be spaced? There should be a clear distance at least equal to the bar diameter between parallel bars but never less than one inch. In some cases, concrete needs reinforcement with steel mesh. Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. Design Rules - Footing/Pile Cap Rebar. The thickness of concrete floor slabs supported directly on the ground shall not be less than 3 1 / 2 inches (89 mm). ASCE, SECB COURSE CONTENT Slab on Grades Construction: Introduction Concrete slabs on grade are a very common type of concrete construction. 006 inch; 0. L is the effective length of the beam and slab. 2. In two-way construction, According to Clauses 8. 3 -SPACING OF TRANSVERSE REINFORCEMENT 11. What Size Rebar for Concrete Slab? This usually depends on the intended workload. ˘ ˘ˇ Spacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. In either case, blocks should be used under the reinforcement to keep centered. Crazing is a result of poor surface curing and only visible in hard troweled slabs. If the slab is more than 24 inches thick, #5 (#5/8 inch diameter) rebar may be required. Dosage amounts shall be from 0. Industry Practitioners. , S. 1. In the process, install bar chairs (various types are available) in cores where vertical rebar must be installed. Whether the frame is precast, cast-in-place, masonry, or structural steel it can be accompanied by a HollowCore floor slab system. However, if the concrete slab is meant to be the footing of a small structure, #4 rebar with a diameter of 1/2-inch should be used. 2: Repeat and continue to draw complete (closed) shape. 5 bars; There shall be a minimum clearance between parallel reinforcement bars of 2 1/2 inches; Bars larger then # 5 increase the chances of shadowing (voids behind rebar) Always use the larger of the two. You cut as 4,000mm +760mm = 4,760mm. The suspended reinforced concrete slab is tied into the external capping beam. If the pressure on the concrete is to come from the top of the slab, the reinforcement should be laid deep near the bottom of the slab. For general purpose concrete slabs with 2,500 pounds compression strength, like patios, use a 1:2:4 concrete mix ratio. The national average cost of a concrete slab is $6. Overlap joints by a minimum of 12” for #3 and 15” for #4, bind with wire ties, and keep the steel 3” back from the. 2. There are three different sizes of rebar typically used for home construction projects. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. To use our rebar calculator, simply input the dimensions and specifications of your project. We would like to show you a description here but the site won’t allow us. R403. ( rS) Rebar Size (2,3,4,5,6,7,8,9,10,11,12,14,16,18,20) Use Size "0" for. Slabs. 00 m 7. Floor slabs can range from a simple residential basement slab to a heavy-duty industrial floor. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. The architect's instructions on the plan are: “New conc slab with #3 transverse bars at 12” O. The no. Content intended for mature audiences. a car weight about 5000lb. If the slab is poured against an existing foundation wall or another slab, you would use the #4 or #5 rebar to dowel it to the which ever you are butting too. Enjoy the Rebar Calculator for Slab. Tie wire is used to hold rebar in place to ensure that when concrete is placed the bars do not shift out of position. The steel rods help reinforce the strength of the concrete slabs giving the structure a strong form. The main bars are usually positioned in the slab’s bottom layer, with a minimum cover distance of 20mm from the slab’s bottom. 21 = 183. , 12, 24,. I have reinforced composite slabs 3 ways: all mesh (my least favorite), all #3 bars, or mesh w/ rebar over the beams only for slab negative reinforcement. For beams, these distances are 300 mm, 180 mm and 150 mm for grades of main reinforcement of Fe 250, Fe 415 and Fe 500, respectively. 00 m 14 over 6. In order to calculate this, you need to input the length and width of your slab. 15m and then Sand level is rammed. Summarize and show schedule of the design outputs such as beam dimensions, main rebars diameter and quantity, and shear rebar diameter and spacing. The following guidelines given below according to BS 7973-2:2001. However, if the concrete slab is meant to be the footing of a small structure, #4 rebar with a diameter of 1/2-inch should be used. 5% reinforcement (reproduced here as Table 1). Cut a second board to the width of the slab. ACI 332, Section 10. This new slab design does not account for second floor installations or installations in a ground floor with a basement beneath. 10. 2 and 9. b) Slab depth does not exceed 200 mm when the steel grade is 460. Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos. Metallic and non-metallic pipes and conduits. Where, d is the diameter of the bar. Reinforcing steel should be properly tied with wire to rigidly support it in its proper. The simplest type of two-way slab to construct is known as a flat plate. For live loads of about 50 psf (2. In a typical reinforced concrete building, reinforcement bars arranged as mats are incorporated into a concrete plate of minimum thickness 125 mm to form a reinforced concrete solid slab. In terms of steel I was going to go with 2% of the slab cross-sectional area in each direction, with a maximum rebar spacing of say 12" to 16" to keep the crack widths small. 6 inches. 3. 2nd. I'm in the process of designing a elevated composite concrete and metal deck floor slab for a warehouse. 5.