A bent up bar in slab is also called a crank. It is extremely important since it is used as the main reinforcement in the floor slab. It is provided in the bottom side of the slab, in the shorter side of the span. The main purpose of providing this bent up bar or crank is to transfer both the dead and live load of the slab to the beam. This load is then carried from the beam to the columns, from the column to the footing, and from the footing to the ground soil.
Why do you need to calculate bent up bar in slab
When you don’t have to deal with a much large construction area, the detailing of reinforcements in slabs can be done by bar bending schedules, by the person in charge of it. Those in charge of BBS or the bar benders can take care of the reinforcement detailing.
However, this method may not be perfect because the bar benders may not be vigilant in taking account of the cranks and bends, though they will give out some amount of cutting length. They might give some extra cutting length, but that will almost certainly not be enough for your bending requirement.
To remedy this problem, all site engineers responsible for considerable floor areas need to be capable of calculating the cutting length of bent bars in slabs on their own, independent of bar benders. This article will try to explain this in detail, to help you in working out the nuts and bolts of the bar cranking process. Please pay attention because it can be complicated.
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Published By
Arka Roy
www.constructioncost.co
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