If you can get 20' long bars the total length of your slab can be 20'. For ribbed slab, perform the bending calculation and choose the reinforcement (Load on each rib. Splitting the slab into two parts for easy calculation. Reinforcement Calculation for Circular Slab, Step 2 – Find the Number of (L) Bars required, Step 4 – Bar Bending Schedule Format – Circular Slab, A room specifically designed for circular slab, ) x 2 where h1 = distance between L & L1 or spacing of bars – 200 mm, The circular slab has reinforcement on both sides, so the. Subtract the clearance from the length and width to find the dimensions of the grid. How to Calculate Staircase Concrete Quantity? First, calculate the number of bars required (main and distribution both). The slab should be provided steel bars to withheld tensile force, so this slab is called the RCC slab. Derivation of D2/162 in Steel Weight Calculation. lineal feet of rebar plus the amount of waste. Thus, the maximum reinforcement ratio corresponds to a net tensile strain in the reinforcement, €t of 0.004. Concrete Structures & Design Sessional I One Way Slab Design Submitted To: Mr. Meraj Rubayat Kamal Md. T =range of temperature the slab is expected to be subjected to (F o) ∝∝∝∝ = thermal coefficient of concrete (in/in F o) Es = modulus of elasticity of steel (psi) The normal range of the coefficient of thermal expansion of concrete ( ∝) is 5 to 7 x 10-6. Thickness of the slab is decided based on span to depth ratio specified in IS456-2000. Steps to calculate the Reinforcement required for Slab:-Deduct the cover for finding length of bar. The spacing of main bars is … (percentage). L2= (√R2 – H22)2 R = Radius Of Slab ( Excluding Nominal Slab ) … 1.1(b) shows two center strips of a rectangular plate with spans l a and l b. Interior floor slabs are usually not subjected In the given slab system a. Take out the guesswork, and the “she’ll be right” approach knowing how much mesh you need in your slab with a simple formula. The slab should be strong enough to bear the required load according to design. L= Diameter Of Slab – Nominal Cover. slabs are plate elements used to form the floors of buildings. Total length of distribution bars Ly = L+2 (L1)+2 (L2)+2 (L3)+2 (L4)+2 (L5)+2 (L6)+2 (L7) = 2.95+ (2×2.92)+ (2×2.84)+ (2×2.70)+ (2×2.48)+ (2×2.16)+ (2×1.72)+ (2×0.93) Minimum reinforcement is 0.12% for HYSD bars and 0.15% for mild steel bars. RCC stand for reinforced concrete. Firstly you need the dimensions of slab. So, let’s learn the process of… Rebar Calculation For Slab In a building construction project, we need to calculate the quantity of slab reinforcement for […] Fig. Rifat Bin Ahmed ID: BCE 1402002207 Section: B3 2. The Calculation. If you can get 60' long bars the total length of your slab can be 60'. the amount the waste factor will add in lineal feet. I have given an example for the calculation of the quantity steel rod in slab below. minimum thickness of RCC slabs is 6 inches. There for I am skipping the calculation part. (feet + inches) Enter the width. Assume you have to prepare a bar bending schedule for a circular slab of 3 metre diameter with 12mm main & distribution bars with 200mm spacing; concrete cover of 25mm. Length of Head = (2×spacing) + (2×50) There is two spacing between 3 reinforcement and 50 mm length both side of 1st and 3rd reinforcement used in footing. Mass of reinforcement= density*volume. Calculation of slab reinforcement steel quantity with simple excel sheet This simple excel sheet will help you in calculation of quantity of reinforcement steel required for slabs, just put the basic details as shown in above figure, it will calculate the steel quantity and show you in a table which you can print and file it for record. No. The length of Extra bar is L/4. (feet + inches) Enter the grid spacing. Bala is a Planning & QS Engineer working at Megha Engineering & Infrastructure Limited. The calculation of One Way Slab Reinforcement Details Design is extremely tedious and time-consuming and after give more time is not 100% sure that design is best or not and also if some minor change comes in design if force to calculate full design step again and again . Select either the Theoretical (required) reinforcement layout located in the RC slabs design or Design > Required reinforcement of RC slabs/walls - options > Calculations to evaluate the reinforcement area for plates or shells. If you can get 40' long bars the total length of your slab can be 40'. Enter Main and distribution steel diameter in Excel Sheet. Where Reinforcement is called a steel rod. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years design life. SELFWEIGHT OF SLAB = 0.18 X 24 = 4.2 KN/m2. This type of slabs is supported on columns and beams. Reinforced concrete slab is very important element to make a building. The materials to be used are grade C25 concrete and grade 500 reinforcement. (inches) Enter a … Read also: Reinforced concrete design to Eurocode 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. Note – The circular slab has reinforcement on both sides, so the value will be multiplied by 2 to get the reinforcement length on the perpendicular side. It is a type of structural element. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. 2) height of chair :- vertical distance of chair bar is known as height of chair, it is main part of calculation to … (Convert Inches to feet) Enter the Thickness of the slab in mm only. Slab Reinforcement. Note – We need to calculate the Typical L’s for the 1 st half only, for the 2 nd half we will multiply it by 2 excluding the main bar.. Circular Slab Reinforcement Calculation. FORMULA = ( Total length – Clear cover )/ center to center spacing + 1 Main bar = (5000 – (25+25))/100 + 1 RCC Column Note here we are dealing with a simple manhole cover for calculation purposes; we have taken greater value as the diameter of the slab. The thickness of concrete slabs depends on loads and size. of bars= (Slab length (S)/spacing)+1 Equation 2. (If Don’t have cover details let it … Extra Bars:- The extra bar is provided at the bottom of Cranked bars to maintain the framework of the slab. Then, show all rebars in cross section and longitudinal sections. Distribution bar = 8 mm @ 130 mm c/c. Calculate the amount of rebar reinforcement needed for slabs and drive ways. For uniformly distributed loads of w per square foot of the slab, each strip acts approximately like a simple beam uniformly loaded by its share of w; i.e., w a and w b 1. 5. It assumed in this calculator that they are the same. Enter Cover Details. Reinforced concrete (R.C.) For example, if the slab is 10′ x 10′ and the clearance is 3″, the size of the rebar grid will be 9′ 6″ x 9′ 6″. Charpy Impact Test – Energy Absorption of Metal. (inches), Enter a waste factor, if required. FLOOR SLAB SCREEDING = 0.08 X 20 = 1.5 KN/m2. Step -1 : Calculation of no. 1.1: Load transfer in (a) One-way slab, (b) Two-way Slab (Nilson) Fig. Then you can calculate the quantity of concrete (volume=length*breadth*height). Whereas in one-way slab the reinforcement is provided in one direction as it carries load in … Its very easy, if you want gross values. Let’s discuss with an example calculation. Design of reinforced concrete structures(one way slab)+with calculation. Clear cover = 30 mm From top to bottom. 1. Main bars of 12 mm and cross bars of 10 mm are applied in the slab. of bars Calculate the number of bar required in both main and distribution bar. One-way solid slabs are designed as rectangular sections subjected to shear and moment. 3. Save my name, email, and website in this browser for the next time I comment. For ribbed slab, make the calculation of shear and choose shear reinforcement. What is the full form of 1BHK, 2BHK, 2.5BHK? Interactive Scaled Diagrams - Inch Formula = ( Total length – clear cover)/c/c spacing +1 For This Cause Using Pythagoras Theorem To Find Out The Length Of Each Reinforcement. For Pythagoras Theorem L1= (√R2 – H12)2 H1, H2, H3 =Spacing Of Reinforcement. The only formula you need to remember for the entire calculation is, From the above diagram, We can calculate the value of L, L = Diameter of Circular Slab – Concrete Cover on both sides = 3000-(2*25) = 2950 mm or 2.95 m, Radius of the slab = (Diameter of the slab – concrete cover on both sides ) / 2 = 2950/2 = 1475 mm or 1.475m, Number of L Bars = (Diameter of the slab – concrete cover on both sides)/Spacing = 1475/200 = 7.375 or 7 Nos, Apart from the Centre Rod (L), we need 3 more bars on both sides such as L1, L2, L3, For L = √(R2 – h12) x 2 where h1 = distance between L & L1 or spacing of bars – 200 mm, Therefore, L1 = √(R2 – h12) x 2 =  √((1475)2 – (200)2)x2 = 2066.7 mm, L2 = √(R2 – h22) x 2= √((1475)2 – (400)2) x 2 = 2007.8 mm, L3 = √(R2 – h32) x 2= √((1475)2 – (600)2) x 2 = 1905.58 mm. The use of this calculator depends on the maximum length you can get your bars. In practice, the circular slab of 3m diameter may have detailed reinforcement. (inches) Enter the required splice (overlap) of your bars. The reinforcement is generally taken as 1% of the volume of concrete. Following the process, you can easily calculate the quantity of steel required for any type of slab. The slab has to carry a distributed permanent action of 1.0 kN/m2(excluding slab self- weight) and a variable action of 3.0 kN/m2. Evaluate the length of the distribution bar PARTITION ALLOWANCE = 1.0 KN/m2. Pounds per Cubic Yards / Pounds per Cubic Foot, Concrete Cost from a Price per Cubic Yard, Convert Cubic Feet to Cubic Yards and Metres, Enter the required splice (overlap) of your bars. Thickness = 150 mm. In equation 1, center to center spacing of main reinforcement steel bars are used and shrinkage and temperature bar spacing is used in equation 2. Plan of Slab Reinforcement Steps to Calculate Steel Quantity: Enter Length and Width of your slab in ft in Excel Sheet. OTHER FINISHES ASUMED = 0.45 KN/m2. Approx Steel requirement = 1 x 7850 x 1% = 78.5 Kg/m3. The modulus of elasticity (E s) of reinforcing bars is generally taken as 29 x 106 psi. TILES ON FLOOR SLAB = 0.02 X 23 = 0.35 KN/m2 3.25. Enter the length. Only the Calculations option is active which may be performed using either the equivalent stiffness (elastic) or the stiffness update (inelastic) methods. 1: Types and arrangement of steel bars in one way slab. Reinforcement ratio is the ratio of reinforcement area to gross concrete area based on total depth of slab. This is needed to determine both the lengths of the rebar and how many rows and columns are needed. RCC Slab. He is the author, editor of Civil Planets. Solution, Given that; Length = 6 m. Width = 2.5 m. Main bar = 12 mm @ 100 mm c/c. Pd=9.5 kN/m) (10p) b. Unlike one way slabs, circular slabs are subjected to bending moments in both directions. We have discussed Bar Bending Schedule for different structural members such as, Here we are going to discuss the Bar Bending Schedule for Circular Slab, Circular slabs are not usually common like flat rectangular slabs that we use almost every floor. LEARN MORE SLAB SOFFIT RENDERING = 0.03 X 20 = 0.5 KN/m2 3.15 4.19. https://civilplanets.com/circular-slab-reinforcement-calculation Calculate Optimal Rebar Spacing and Weight for Concrete Slabs. The calculation for distribution bar for circular slab reinforcement will be exact same as main reinforcement. BBS for Slab.In This channel You can Learn about Civil Engineering Update Videos which are using generally in civil Engineering. Minimum Reinforcement Ratio: The grid is the horizontal and vertical spacing of your rebar. This is a step by step process of rebar calculation for a slab. For example, if a volume of concrete 1 m3 for a slab. Example calculation: Steel quantity = Volume of Concrete x Density of Steel x % of Steel. 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