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. of bars Calculate the number of bar required in both main and distribution bar. RCC stand for reinforced concrete. (inches), Enter a waste factor, if required. What is the full form of 1BHK, 2BHK, 2.5BHK? Minimum Reinforcement Ratio: The grid is the horizontal and vertical spacing of your rebar. RCC Column Whereas in one-way slab the reinforcement is provided in one direction as it carries load in … Concrete Structures & Design Sessional I One Way Slab Design Submitted To: Mr. Meraj Rubayat Kamal Md. 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) Example calculation: Steel quantity = Volume of Concrete x Density of Steel x % of Steel. Step -1 : Calculation of no. 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. 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. Main bars of 12 mm and cross bars of 10 mm are applied in the slab. If you can get 20' long bars the total length of your slab can be 20'. Where Reinforcement is called a steel rod. FLOOR SLAB SCREEDING = 0.08 X 20 = 1.5 KN/m2. Distribution bar = 8 mm @ 130 mm c/c. Evaluate the length of the distribution bar Save my name, email, and website in this browser for the next time I comment. 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. L= Diameter Of Slab – Nominal Cover. Charpy Impact Test – Energy Absorption of Metal. It is a type of structural element. Firstly you need the dimensions of slab. (feet + inches) Enter the width. 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. the amount the waste factor will add in lineal feet. The thickness of concrete slabs depends on loads and size. 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. Note here we are dealing with a simple manhole cover for calculation purposes; we have taken greater value as the diameter of the slab. No. Reinforced concrete slab is very important element to make a building. The materials to be used are grade C25 concrete and grade 500 reinforcement. Reinforcement ratio is the ratio of reinforcement area to gross concrete area based on total depth of slab. Calculate the amount of rebar reinforcement needed for slabs and drive ways. Extra Bars:- The extra bar is provided at the bottom of Cranked bars to maintain the framework of the slab. slabs are plate elements used to form the floors of buildings. Assume We need to calculate the reinforcement for a circular slab of 2 Metre diameter with 12 mm main rod and 10 mm distribution rod @ spacing 200 mm and clear cover as 25 mm. 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 . 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. SELFWEIGHT OF SLAB = 0.18 X 24 = 4.2 KN/m2. FORMULA = ( Total length – Clear cover )/ center to center spacing + 1 Main bar = (5000 – (25+25))/100 + 1 Unlike one way slabs, circular slabs are subjected to bending moments in both directions. (percentage). Only the Calculations option is active which may be performed using either the equivalent stiffness (elastic) or the stiffness update (inelastic) methods. The spacing of main bars is … Circular slabs are used in the following areas. 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. Rifat Bin Ahmed ID: BCE 1402002207 Section: B3 2. Reinforced concrete (R.C.) (inches) Enter a … 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. Then you can calculate the quantity of concrete (volume=length*breadth*height). How to Calculate Staircase Concrete Quantity? 1. For This Cause Using Pythagoras Theorem To Find Out The Length Of Each Reinforcement. 1.1(b) shows two center strips of a rectangular plate with spans l a and l b. SLAB SOFFIT RENDERING = 0.03 X 20 = 0.5 KN/m2 3.15 4.19. For Pythagoras Theorem L1= (√R2 – H12)2 H1, H2, H3 =Spacing Of Reinforcement. (If Don’t have cover details let it … Following the process, you can easily calculate the quantity of steel required for any type of slab. Where, D = Depth of Slab- Top cover – Bottom cover. Enter the length. 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 diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. This is needed to determine both the lengths of the rebar and how many rows and columns are needed. OTHER FINISHES ASUMED = 0.45 KN/m2. Calculate Optimal Rebar Spacing and Weight for Concrete Slabs. 1. If you can get 40' long bars the total length of your slab can be 40'. The reinforcement is generally taken as 1% of the volume of concrete. lineal feet of rebar plus the amount of waste. Bala is a Planning & QS Engineer working at Megha Engineering & Infrastructure Limited. This is a step by step process of rebar calculation for a slab. Let’s discuss with an example calculation. I have given an example for the calculation of the quantity steel rod in slab below. 2) height of chair :- vertical distance of chair bar is known as height of chair, it is main part of calculation to … Slab Reinforcement. For example, if a volume of concrete 1 m3 for a 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. The length of Extra bar is L/4. Thickness = 150 mm. Mass of reinforcement= density*volume. Then, show all rebars in cross section and longitudinal sections. L2= (√R2 – H22)2 R = Radius Of Slab ( Excluding Nominal Slab ) … Enter Cover Details. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years design life. minimum thickness of RCC slabs is 6 inches. Pd=9.5 kN/m) (10p) b. Splitting the slab into two parts for easy calculation. RCC Slab. 1: Types and arrangement of steel bars in one way slab. Interior floor slabs are usually not subjected Design of reinforced concrete structures(one way slab)+with calculation. If you can get 60' long bars the total length of your slab can be 60'. (feet + inches) Enter the grid spacing. It assumed in this calculator that they are the same. This type of slabs is supported on columns and beams. Derivation of D2/162 in Steel Weight Calculation. Thus, the maximum reinforcement ratio corresponds to a net tensile strain in the reinforcement, €t of 0.004. Interactive Scaled Diagrams - Inch Minimum reinforcement is 0.12% for HYSD bars and 0.15% for mild steel bars. Approx Steel requirement = 1 x 7850 x 1% = 78.5 Kg/m3. For ribbed slab, perform the bending calculation and choose the reinforcement (Load on each rib. 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. The calculation for distribution bar for circular slab reinforcement will be exact same as main reinforcement. 1.1: Load transfer in (a) One-way slab, (b) Two-way Slab (Nilson) Fig. Clear cover = 30 mm From top to bottom. 5. There for I am skipping the calculation part. LEARN MORE The slab should be provided steel bars to withheld tensile force, so this slab is called the RCC slab. 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. Solution, Given that; Length = 6 m. Width = 2.5 m. Main bar = 12 mm @ 100 mm c/c. The Calculation. Thickness of the slab is decided based on span to depth ratio specified in IS456-2000. First, calculate the number of bars required (main and distribution both). Enter Main and distribution steel diameter in Excel Sheet. Plan of Slab Reinforcement Steps to Calculate Steel Quantity: Enter Length and Width of your slab in ft in Excel Sheet. 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. 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″. 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. of bars= (Slab length (S)/spacing)+1 Equation 2. (Convert Inches to feet) Enter the Thickness of the slab in mm only. Formula = ( Total length – clear cover)/c/c spacing +1 BBS for Slab.In This channel You can Learn about Civil Engineering Update Videos which are using generally in civil Engineering. Its very easy, if you want gross values. Fig. Fig. https://civilplanets.com/circular-slab-reinforcement-calculation One-way solid slabs are designed as rectangular sections subjected to shear and moment. He is the author, editor of Civil Planets. PARTITION ALLOWANCE = 1.0 KN/m2. In practice, the circular slab of 3m diameter may have detailed reinforcement. Read also: Reinforced concrete design to Eurocode 2. The slab should be strong enough to bear the required load according to design. Steps to calculate the Reinforcement required for Slab:-Deduct the cover for finding length of bar. In the given slab system a. 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 […] 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. (inches) Enter the required splice (overlap) of your bars. 3. 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 The use of this calculator depends on the maximum length you can get your bars. For ribbed slab, make the calculation of shear and choose shear reinforcement. Is generally taken as 29 x 106 psi grid spacing choose shear reinforcement length and Width find! 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