Why alternate bars are given bent-up in slab and how to decide the length of b

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Why alternate bars are given bent-up in slab and how to
decide the length of bent up?

Question Posted / yfidvi

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Why alternate bars are given bent-up in slab and how to decide the length of bent up?..

Answer / v.prudhvi raju

for controlling negative bending moment in slab,we should
provide bars at top corners of the slab,by providing bent up
bars we are controlling negative bending moment and shear
also...(shear is acting in diagnolly)

Is This Answer Correct ?

44 Yes

5 No

Why alternate bars are given bent-up in slab and how to decide the length of bent up?..

Answer / santosh singh

because it is economical and there is good anchorage.

length of bent up is L/4 OR L/5

Is This Answer Correct ?

27 Yes

10 No

Why alternate bars are given bent-up in slab and how to decide the length of bent up?..

Answer / syed shujauddin

Due to partial fixity at support position of a beam/slab section, a negative BM occurs at the end position , and it means tensile side is now at upper portion of the section and compressive side at the bottom portion, i:e: a hogging moment forms, and as we know that concrete is more safe at comp. side than tension, so we provide bent up bars at the upper most part of it to resist that amount of negative BM.

Is This Answer Correct ?

14 Yes

1 No

Why alternate bars are given bent-up in slab and how to decide the length of bent up?..

Answer / govind tawer

Length of Bent up Bar is L/7.

Is This Answer Correct ?

12 Yes

10 No

Why alternate bars are given bent-up in slab and how to decide the length of bent up?..

Answer / muskan

The bent up is at L/7 distance
But in case the of a continuous slab, the bent up is at L/5.