why we provide crank bars or bent up bars in rcc roof slab

In this video i show you how we provide bars which resist the negative bending moment .....and some supervision tips related to those bars.......its very important to all fresh civil engineers to understand it......so check it out.....
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==Column Construction Drawing plan reading | How to read structural drawing in Urdu/Hindi Part - 4 video...
https://www.youtube.com/watch?v=75Srvv4DKOU&t=228s

==How to study Structural drawings Notes in Urdu/Hindi Part -3 video...
https://www.youtube.com/watch?v=UxIuj0iH9PQ&t=25s

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Видео why we provide crank bars or bent up bars in rcc roof slab канала F&U-FORYOU