![]() To keep the crank bar in position, an extra bar of length (L/4) is provided below the crank bar as shown in the below figure. The additional length is added to the total length of the bar if the bars are cranked at a certain angle.Įxample Calculation considering Bent up bar in Slab (Cranked bar):. Giving different θ values as 30 0 , 45 0, 60 0 results different additional length l a values as below. Therefore from (i) :- l a = D/ Sinθ – D/ tanθ To calculate the bend length the below procedure is followed.įrom the above figure as the bar is bent at an angle θ 0 the additional length (l a) is introduced. The below figure depicts the bent up bar in Slab. To resist these stresses we usually crank the bars at the ends of supports in the slab. (i) Bend Length calculation in Cranked Bars:-Īs Shear stress is maximum at supports in Slab. The bars are usually cranked in Slabs and bars are bent at corners in Stirrups or ties. The Bend length calculation is different for Cranked bars (bent up bars) and bends at corners. Hope, now you are clear with the Hook length calculation. Therefore Total Cutting length = L+18d (d is the Diameter of a bar) Total Cutting Length of stirrup or tie = Total length of Bar + 2 x Hook Length (Two hooks) Hook Length = 9d Įxample Calculation considering stirrup with the hooks at ends:įor clear understanding, look at the below image for calculation of the total length of stirrup the with two hooks at ends. In general, Hooks are added at the two ends of the rebar in stirrups or ties.īelow image makes you clear why the Hook length = 9dįrom above fig, length of hook = 9d The hook length is commonly provided for stirrups in beams and ties in columns. Hook Length or Cutting length of Stirrups:. To keep it clear, firstly the concepts are discussed and in the end, this post is closed with an example of BBS calculation of a member. All these concepts are used in BBS design calculation of any structural member. If length of bar is 12m with 10mm Dia then ,īelow I am discussing the different concepts of Bar Bending schedule which are very useful while working with BBS. (If you are viewing the below table through mobile, scroll horizontally for a clear view) The below-mentioned table is a kick-start guide for learning Bar bending schedule from scratch. Bar Bending Schedule :-īefore dealing with the BBS, it’s very important to learn the basics of Bar bending schedule. Now we are constructing 200 + floors in the small area. He gave recommendations according to the potentiality of construction at that time. ( They are outdated “not wrong”) He wrote that book in 1950. So, the percentage of steel is increased in a column which reveals that the above-cited values are outdated. But, he didn’t mention any values if we use more bars in a single structural member.Īt that time we’ve used only four bars in columns now we are using 12+ bars in columns based on load analysis. Datta has given certain recommendations for the usage of steel in different components of buildings. Due to the vast increase in world population demands increased facilities, more need for space and more construction.įather of Estimation B.N. ![]() There is a massive growth in the construction industry. In 1950, three-storeyed buildings are high rise buildings now we are constructing a building with 200 floors+. How BBS Changed from 1950-2019:-įrom 1950 to 2019 lots of modifications and enhancements happening in our world. of Bars used), Cutting length, Type of Bend and Shape of the bar in reinforcement drawings. ![]() In Bar bending schedule, the bars are organized for each structural units (Beams or columns or slabs or footings etc) and detailed list is prepared which specifies the Bar location (Bar in footings, slabs, beams or columns), Bar Marking (to identify the bar in accordance with the drawing), Bar Size (length of the bar used), Quantity (No. But how much steel required for constructing 15 floors building? How much Steel I have to order? All these questions are answered in BBS The bar may be a Mild Steel bar or HYSD bar or TMT Bar.īar Bending Schedule is termed as “Calculation of the total Steel required for the construction of a building” We use steel to make concrete to be reinforced and for tension requirements. Let’s Get started.įirst of all, Bar is any type of rebar which is used as a reinforcement in RCC. It’s a lengthy article, so brace yourself for atleast 10 minutes. Important rules while preparing Bar Bending Schedule.What is Bar Bending Schedule? and its Importance.
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