thickness of slab formula

10. I have read through ACI 360R-06 "Design of slabs on ground" and -10 and none of which really have given me a suitable way to prove that the thickness I assumed works. Slabs shear strength should be addressed if less than the ultimate shear load exerted on it. Its also possible that what works in one state may not be legal in another, depending on the laws in that state. The minimum thickness can be determined by many factors: Shear strength of beamless slabs (usually a controlling factor); slab must be thick enough to provide adequate shear strength Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! However, you must also be careful not to spend too much money on its construction by ensuring it isnt too thick. Some slabs might measure up to 20 inches in thickness. Width of slab S2 = 7443/2 = 3721.5 mm. These slabs are mainly applicable where structure requires less formwork. In design the assumed approximate depth has to be checked for stresses, deflection, punching shear(if it is a flat slab) etc. There are a few rules of thumb you can plan with and your codes may specify minimums, but if you are worried about l. Minimum Standard Concrete Slab Thickness For Office Building Civil Sir. Ld= development length (which is 40 d) d is dia of bar. Under strain, a concrete slab will split if it is made too thin. Calculate the square footage by measuring the length and width of the area to be covered. Just plug in the numbers, make sure you choose meters, and hit calculate. Main bars: Formula =L+2Ld+ (10.42D) - 21d. Using bending and shear needs to determine the thickness of a slab is not shared. Floors - Reinforced Slab Length. RCC roof slab is horizontal structure is to provide flat surface on floor/ceiling in building. Four to twelve inches is a good thickness range for precast concrete walls when built solidly. Minimum Clear spacing between bars based = aggregate size + 5; generally, we use 20mm aggregate for concrete works. If there is a different thickness at any point along the punching shear perimeter, the program will use the thinnest thickness for the entire calculation. Solved 3 4 0 M 12 3rd Floor Slab 0m 2nd Chegg Com. for example in high rise building if increase the thickness of RCC slab by 5mm result significantly increases column axial load. From pg no 91 IS 456-2000. You can target the Engineering ToolBox by using AdWords Managed Placements. Determination of Moments of slabs (Laterally . of steps in flight x tread) + width of landing beam] Thickness of waist slab = span /20 = 4000/20 = 200 mm To learn the remaining process, watch the following video tutorial. LL = 6.76 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 = 69.5 try 100 mm Dead load Slab weight = 2.36 Live load Canopy = 1.9 Factored loads Factored dead load = 3.3 Factored live load = 3.23 Total factored load = 6.53 Compute moments At support: ( - ) M1 = 3.27 . The slab is infinitely long in the y-z plane, but has thickness d along the x axis. The red block therefore displaces 1.25 L water, an amount equal to the volume of the block. Step 2. Convert a measurement in inches to a measurement in feet. Traffic engineers, any thoughts on this? Slab thickness formula:- slab thickness formula calculation is only based on construction and detailing requirement according to BS8110 part 01 says that. Negative Moment on Continuous Edge = 0.087 x 288.5 x 10^2 = 2.510 k-ft. Sandwich precast concrete walls, with the 1-4-inch insulation, should be 5-12 inches thick as well. Concrete Slab Floors Yourhome. Cookies are only used in the browser to improve user experience. The prospect of investing more money on a thicker slab may attract some individuals to minimize costs. You have entered an incorrect email address! One-way slab. You should ensure that your concrete slab is at least 3.5 inches thick if you want to use it as direct support on the ground. Can I just design it as a one or two way slab and find thickness that way? I assumed a typical value of 6 thickness but I know when it comes times to give the speech on how I determined 6 would work, I wont be able to prove it. The basement space has become inefficient as a parking area so I'd like to transfer this whole structure to an 8x8 or 16x16 grid of columns by using the transfer floor/slab. The design of slabs for these conditions is covered in ACI . If necessary, appropriate techniques should be used. So if you make a column of size 250mm x 250mm it should not exceeds the height of 3m. The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure. As per ACI 318-14 code, the conduits and pipes should not be greater in . Concept Videos. Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm. Deflection and shear criteria must be met by two-way slab thickness. Homework Statement: Consider a slab centered at the origin with uniform volume charge density, . Main Steel - 3d or 300 mm whichever is smaller; Distribution Reinforcement for Concrete Slab Design: Depth of a simply supported one way . ii. Example if we take maximum coarse aggregates size is 20mm then we have to take 4X20=80mm minimum as per IS code provisions. However, most residential and commercial structures have a six-inch thick concrete slab. Decide on the desired thickness of the concrete. spacing formula for main bars of columns: 1) 2) The total system completely counts on the geometrical dimensions of the slab in which if the ratio Long side / short side Two Way Slab Reinforcement Calculation A standard residential driveway is commonly 4-6 inches thick concrete with re-enforced steel bars 3 on the wind speed to account . Step 1 - Find out the no. Negative Moment on Discontinuous Edge = 1/3 x 0.432 = 0.144 k-ft. . For example, the percentage of reinforcement of a 30-inch slab with two layers of No. Patio slabs, on the other hand, are usually four inches wide. Example: Height = 8', Length = 40', Thickness = 8" Convert thickness to feet: 8 12 = 0.667 feet Volume in cubic feet = .667 x 8 x 20 = 213.44 ft Volume in cubic yards = 213.44 ft 27 = 7.9 yd Volume in cubic meters = 213.44 ft x .0283 = 6.04 m This might not apply to your situation, be sure the method sits right with you. Columns can build as long column fails by buckling. According to Unified Building Code (UBC), the least thickness of ribbed slab should be 1/12 distance among ribs or 51mm. We don't collect information from our users. the width of the slab in metres; thickness of the slab in millimetres; Results. finally it affect the cost of construction. Slab area in square meters: 100.00 m 2. You Can Follow me on Facebook and Subscribe our Youtube Channel, 1)what is concrete and its types and properties, 2) concrete quantity calculation for staircase and its formula. It is possible to lessen the thickness of a slab without affecting its structural integrity if a concrete specialist approves of the plan. Mx = x wlx 2. Use of 5 to 6 (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads. The minimum RCC beam size should not be less than 9 9 or 225mm 225mm with the addition of a 125mm rcc slab thickness. I am a Civil Engineer by profession but Ive specialized and taken the journey in the field of Quality Engineering. My name is Engr Waseem Raja and Im the author of TheCivilEngineerings.com. Punching Shear Perimeters That Cross Different Slab Thicknesses. Slab thickness for apartment:- thickness of slab for apartment must be at least L/20 for simply supported slabs; L/24 for slabs with one end continuous; L/28 for slabs with both ends continuous; and L/10 for cantilevers; where L is the span. HOWEVER, in real life situations a slab is NOT loaded uniformly. On the other hand, residential and commercial structures need a six-inch thick concrete slab. Use of 5 to 6 (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads. A variety of variables influences concrete slab thickness. Reinforced concrete allows a wide range of structural options and provides cost-effective solutions for a multitude of situationsfrom residential buildings with moderate live loads and spans of about 25 ft, to commercial buildings with heavier live loads and spans ranging from 40 ft to 50 ft and beyond. Maximum Height of Concrete Column, tandards such as ACI 318 specify the minimum thickness of the slab based on the length of the slab. As a result, what works in Europe may not necessarily work in the United States or South America. In this video i will teach you that how to calculate thickness of One way and Two way slab According to ACI 318.#SlabThickness#MinimumThickness#ACI_318#ACI#C. Chain-link enclosure and rocks within. If the consistency is chosen based on deflection requirements, it must still be tested throughout the design process. The stronger the slab will be, the more concrete is, normally put at a thickness of 2 inches or more. Design the slab following the provisions of the ACI code. Additionally, floors must be at least 12 inches below the frost lines in areas where freezing is a problem. 3 Inch Composite Floor Deck 3 inch composite floor deck is the deepest composite floor deck that's readily available. For example, in a conventional garage, the concrete slab must be at least four inches deep to meet building code requirements. Beam length from Grid- (L - M) is 7443 mm and Grid- (1 - 2) 5320 mm as given. Search: Concrete Slab Load Capacity Calculator . no. Enter your length, width, and thickness then hit calculate and you'll see how many cubic yards you need. Maximum Size of Concrete Slab, Concrete Slab Thickness, Maximum Thickness of RCC Slab, Maximum Height of Concrete Column, In this Article today we will talk about the Maximum Size of Concrete Slab | Concrete Slab Thickness| Maximum Thickness of RCC Slab | Maximum Height of Concrete Column | Maximum Length of Concrete Beam | Standard Size of Beam | Column Dimensions | Concrete Column Sizing | Minimum Concrete Thickness, The maximum span & depth of a beam(cantilever / simply supported / continuous) are decided bydeflection limits. It is only possible to use this kind of slab in regions that are not expected to sustain much weight. The size of the columns depends on the total load on the columns. Other than that, the concrete mix grade and grade of Steel is also an important factor to the thickness of slab. Save my name, email, and website in this browser for the next time I comment. The thickness of your concrete slab will be determined in part by the local building regulations. Calculate the percentage of reinforcement with the formula P = 8.33UA/t, where P is the percentage and t is the thickness. All 250psf would be directly transferred through the concrete to the soil. te = Equivalent thickness of the slab calculated as the net area of the slab divided by the width, in which the maximum thickness used in the calculation shall not exceed 2 t. For SI: 1 inch = 25.4 mm. Slab thickness in m:- General, 0.10m to 0.15m slab thickness is considered for residential and commercial building with reinforcement detail as per design. There would be no shear or bending forces in the slab at all. 2. Maximum Chip Thickness obtained in Slab Milling using Depth of Cut is a method to determine the maximum thickness of scraped Chip generated when worked under a given Depth of Cut and is represented as A c max = 2* V f * sqrt (d cut / D t)/(N * rot) or Maximum Chip Thickness = 2* Feed Speed * sqrt (Depth of Cut / Diameter of a Cutting Tool)/(Number of Teeth on Cutting Tool * Rotational . 1. It's the strongest metal floor deck and can span the furthest. Choosing a thick enough slab for both internal and external columns is critical. The minimum thickness of the slab base is calculated from t = sqrt ( 3w/Qbs * (a^2 - b^2/4 ) ) Where, Qbs = permissible bending stress in the slab base ( 185 MPa ) If a solid round steel column is supported over a square base plate, then the thickness of the base plate is calculated by t = 10 * sqrt ( 90W / 16 Qbs * B / ( B - do ) ) Where, W . How do you calculate percentage of concrete in steel? Load Calculation: Live Load = 2 kN/m 2 Self-weight of the slab = 3.25 kN/m 2 Floor Finish = 1 kN/m 2 Total = 6.25 kN/m 2.

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thickness of slab formula

thickness of slab formula