How to find Two way Slab?
Bars that are placed in shorter span is called main Reinforcement bar and in longer span it is called a distribution Reinforcement bar.
How do you prepare bar bending schedule for two-way slab
Examble of Prepare a bar bending schedule (BBS) of two way slab. The slab size is 3 by 4 reinforcement is 16mm@150mm and 10mm@200mm c/c shorter and longer span direction respectively. Assume the clear cover is 20mm?
This Solution is Quantity of Steel in Two way Slab.
Main Reinforcement bars:
First, we find out the total no of bars in the shorter span
No of bars
= Total span /spacing
= 26.4 say 27 nos of bars
As bar is placed in shorter span which is 3m.
= Total length of span - 2 x clear cover
= 3000 - 2 x 20
= 2960 mm or 2.960 m
So we have total 27 nos of main bars
= 27 x 2.960m = 79.92m
Quantity of steel Main Reinforcement bar
= d²/162 x length
= 16 x 16/162 x 79.92
Distribution Reinforcement bar:
No of bars
= total span/spacing
= 2960 mm/200 mm
= 15.8 say 16 nos
As bar is placed in longer span which is 4m
Cutting Length: = total length — 2 x clear cover
= 4000 - 2 x 20
= 3960 mm or 3.960m
So we have total 16 nos of distribution Reinforcement bar so the total length is
= 3.960 x 16
= 63.36m long bar
Quantity of steel distribution Reinforcement bar
= d2/162 x length
= 10 x 10/162 x 63.36 = 39.1 kg
Total weight of bars:
= weight of main bar + distribution bar
= 126.2 + 39.1