(1) How Do I Calculate Steel Reinforcement and Its Quantity in Slab, Beams, Columns and Footing for Given Dimensions_ - Quora

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(1) How do I calculate calculate steel steel reinforcemen reinforcementt and and its quan quantity tity in slab, slab, beams, beams, columns columns and and foot footing ing for given dimension dimensions? s? - Quora Quora

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How do I calculate steel reinforcement and its quantity in slab, beam beams s, columns and footing for given dimensions? Answer

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Santosh Kulkarni, Kulkarni, Planned and Supervised cons truction for 35 years 65.2k Views • Upvoted by Ravi Babu, Structural Engineer Engineer Santosh is a Most Viewed Writer in Civil Engineering. Originally Answered: How do I calculate steel reinforcement and quantity for slabs, beams, c olumns, and footing?

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Dear Mohammed , Great question from you. Let's start with the basics.

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1.I am sure you must be quite conversant with the reading of RCC drawings so that you can find out the following values from the drawing :

How steel design is calculated for beams and columns (structures)?

Length of the element : Cross Cr oss section: No of bars Type of bars Spacing between the bars. Lap length ( horizontal horizontal/verti /vertical) cal) Development length Covers for footing/column/beam/slab. 2. Calculate the cutting length of the bars. ( total length - covers on bothside )+ development length. 3.Formula : W = N*CL*U W: Weight of reinfo reinforcemen rcementt N: No of bars CL: cutting length U:Unit weight You can find out Unit weight from charts or from the formul formula a: U= D*D/162. Just let me know whether you are able to get these steps. Once you confirm , I can demontrate with an actual example. All the best ! Written Apr 24, 2015 • View Upvotes Upvote 57

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Question Stats Richard Guy, Guy, Richard Guy is a Structural Engineer: worked all over the World.

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Originally Answered: How do I calculate steel reinforcement and quantity for slabs, beams, columns, and footing?

You can do it the tedious way of counting and multiplyng the bars in the slabs and then adding lap la p lenghts in Slabs Columns and Beams. But I will let you you in a little time time saving secret I learned way back in University. We had some real good lecturers in London. They all were working in the various branches of sstructural engineering. The lecturer who

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(1) How do I calculate steel reinforcement and its quantity in slab, beams, columns and footing for given dimensions? - Quora

taught us Quantities had his own QS firm and he gave us the secret to estimating steel reinforcement in a concrete building. It is this. Compile the number of cubic yards in the building and multiply by 125. That will give you a close approximation of the steel that will be necessary in the building. And that is all you need when you are doing estimation of Quaantities. So the rule is; (Cubic Yards of Concrete X 125 pounds) = amount of reinforcement in pounds. I have been using that formula for 40 years and its still good. Good luck Written Jun 1, 2015 • View Upvotes Upvote 32

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Varun Chowdary, Structural design engineer 3.8k Views

For an easy understanding I give you an example, which shows how to make a table for easy calculations of reinforcement quantity in a slab. I make a table like below for most of such calculations:

Now I elaborate how the above table works: a) Before getting into table calculate the volume of the concrete quantity. In this case, since it is a rectangular slab the volume = Length x Width x Thickness. This will be helpful at the end of weight of reinforcement calculation. b) There are total 13 column in the table. I explain one by one how I arrive at them. i) Serial number. ii) Face - You can keep any nomenclature you want to. Since the slab, which I considered has both top and bottom reinforcement to avoid further confusion I gave top layer as near face and bottom layer as far face. Again this entirely depends but this will help you to bifurcate the reinforcement while doing complex calculations. iii) Position - Same explanation for point no. ii) is valid for this point too. There are types of direction in the slab I considered namely longitudinal and transverse. iv) Layer - There can be more than a single layer of reinforcement. So, giving different names to different layers helps you a lot. v) Diameter of the bar as mentioned in reinforcement drawings. vi) Spacing between the bars vii) Length of the bar in the direction of the bar you considered. For example the length of bar in my case is along the longitudinal direction. vii) Extend of the bar is the distance/length for which the bar is extended with its uniform spacing in perpendicular direction. For more clarity refer the following image. It is a slab with a bar showing in longitudinal direction

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viii) N o. of bars - ( Extend of bars length/Spacing)+1. ix) Total length - No.of bars x Length of the bar. x) Unit weight - Density x Volume of the bar. xi) Weight (Kg) - Unit weight x Total length. xii)Weight (Kg / m³) - Weight (Kg) / Volume of slab [ As calculated in step a)] ote: 1)Points i) to iv) are optional. Just for clarity. 2) Length and extend of the bar can be calculated either by hand from the drawings or by the use of Auto CAD. Hope this helps. For further assistance regarding this topic you can contact me. You can also receive all the information on the subject and can also ask questions from experts by visiting Super Brand in Rebar Category (TATA Tiscon) To read more about RCC construction : RCC Construction Written Feb 5 • View Upvotes Upvote

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Jinal Doshi, Structural engineer and founder of structural madness 16.3k Views • Jinal is a Most Viewed Writer in Civil Engineering.

Santosh has already given quite a brilliant answer. He mentioned the very correct way of calculating the quantity of steel required in every member. Let me shed some information from a structural engineers perspective as how we provide information on our drawing and how you can calculate reinforcement quantity from it. 1. Concrete beams Structural drawing present information like number of top and bottom bars, stirrups size and spacing along with some typical details. Typical details include bar development length or hook length, curtailment, splice length and so on. As a person who is calculating quantity of steel, what you should do is multiply the quantity with desired length of bars mentioned in the drawing. So now you have the quantity of longitudinal reinforcement. For stirrups you will be dividing the length of beam with spacing of stirrups and ad one to it. That's how you come up with number of stirrups required. You will required beam cross section dimensions and cover. Now subtract two sided covers from each side and you will get a number corresponding to each breadth and depth. That is how you come up with bar length required for stirrup and you again add some hook lengths as mentioned in drawings. Multiply this is number of stirrups required and you get the quantity of steel required in stirrups. 2. Concrete column Everything is the same as concrete beams, except for the fact that column ties go into the joints not face to face. https://www.quora.com/How-do-I-calculate-steel-reinforcement-and-its-quantity-in-slab-beams-columns-and-footing-for-given-dimensions

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3. Slabs In structural drawing it is generally shown the bar size and spacing required. You already have the dimensions of slab and typical details provided by structural engineer. Again follow the same principle of splice length and development length and hook lengths. Same fundamental as beam. But to come up with number of bars, you divide the dimension (perpendicular to the or bar direction you are looking at) by the spacing Ask of bar and you have Read Question Ask Search Quora the number of bars required. This is how you can calculate the bars required in slabs.

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Now once you calculate the bar size, length and quantity paste the data in a spreadsheet. Multiply each type of bar with it's diameter and length to get the volume. And do this for every entry in your excel column. Multiply the total volume with density of steel and there you go, you have the weight of rebar too. You d on't have to do anything for that. The most important thing is to look at typical details in structural drawings and follow that correctly. You will quite easily and quickly calculate the steel quantity required in every member. I would recommend you to use spreadsheet and formulate it so that it can calculate everything for you and you will make your work much easier. Written Nov 6 • View Upvotes • Asked to answer by Tijo K Thomas Upvote 13


Juzer Shaikh, Civil engineers = creators 23.5k Views • Upvoted by Ravi Babu, Structural Engineer Originally Answered: How do I calculate steel reinforcement and quantity for slab, beams, column and footing?

In columns the reinforcement can be calculated by assuming reinforcement percentage in concrete. Below is an example for column reinforement,

In slabs and beams the reinforcements are calculated as below


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The reinforcement calculations depend on number of factors like type of columns axially loaded or eccentrically loaded and type of slab one way - two way or types of beams. Above shown formulae are for a particular axial column and two way slab. Written Apr 24, 2015 • View Upvotes

Ahmad Rashiq, Inquisitive! 28k Views • Ahmad is a Most Viewed Writer in Structural Engineering. Originally Answered: How do I calculate steel reinforcement and quantity for slabs, beams, columns, and footing?

To calculate the steel reinforcement required, you need to find out the maximum moment that structural part will be subjected to. Steel is provided to resist the moment that would develop and render the structure unstable. You can follow the IS code for finding out the moment generated in these structural parts, multiply it by a suitable factor of safety, get the maximum moment and then provide reinforcement based on this maximum moment. There is a simple formula for calculating the percentage of steel or the area of steel by the limit state method, Mu = 0.87 fyAst d (1- Ast fy/bdfck) where Ast is the a rea of steel.

You must follow the code for determining the minimum reinforcement that is to be provided and this acts as a check on the Ast calculated. Ast > Ast (minimum) The process of calculating moment for beams, columns, slabs and footings is different. Similarly the minimum reinforcement to be provided is also different as given in IS code ( IS 456:2000). The diameter of the steel bars to be chosen is upto the designer. https://www.quora.com/How-do-I-calculate-steel-reinforcement-and-its-quantity-in-slab-beams-columns-and-footing-for-given-dimensions

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If the number of the steel bars is say n, then n*(area of one steel bar)=Ast So u get the value of n. I hope the answer somewhat helped you. Written May 16, 2015 • View Upvotes Upvote

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(1) How Do I Calculate Steel Reinforcement and Its Quantity in Slab, Beams, Columns and Footing for Given Dimensions_ - Quora

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