As usual, before diving into the topic make sure to read the below topics for better understanding.
Let’s Start…
There may be other methods to find out bar bending schedule for column. The below method is just a guide. Some people will calculate for each floor, here we discussed the bar bending schedule for a column to a whole building at once.
Ensure to follow the below rules while bar bending for column
Vertical Bar Length = Footing Development Length + Footing height + basement height + Height of all floors + Slab thickness of all floors + Development length at the end of the column top
Vertical Bar Length = 250+(1200-30-25-20)+650+(4*2750)+(175+150+150+125+125)+50d
= 13750+(50*16)= 14550 mm or 14.55 m
As you know the steel comes at a predetermined length of 12.25 m or 40 feet. From the above calculations, we know that we have to lap the column at least once in order to attain the height.
Assuming, Lap Length of column reinforcement as 40d
Lap Length = 40d = 40*16 = 640 mm or 0.64m
Total Vertical Reinforcement = 14550+640 = 15190 mm or 15.19m
Number of Stirrups = (Total Vertical Bar Height / Spacing) + 1
Total Vertical Bar Height = Footing height + basement height + Height of all floors + Slab thickness of all floors
= (1200-30-25-20)+650+(4*2750)+(175+150+150+125+125) = 13500
Number of Stirrups = (13500/200)+1 = 68.5 or 69 Nos
Cutting Length of Stirrups = Perimeter of Stirrup + 2 hook length – 3 * 90° bends – 2 * 135° bends
= 2(520+220)+(2*9d)-(3*2d) – (2*3d) = (2*740)+(2*9*16)-(3*2*16)-(2*3*16)=1576 mm
Description | Dia of Bar (mm) | Number of Bars | Length(m) | Weight Per metre | Quantity (Kg) |
Vertical Bar | 16 | 6 | 15.19 | 1.58 | 144 |
Stirrups | 8 | 69 | 1.576 | 0.4 | 43.50 |
TOTAL | 187.5 Kg |
Happy Learning 🙂
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Why when calculating the cutting length of stirrups for column we are substracting 3×90°bends and 2×135bends?