If you are looking for a readymade calculator for 4-legged stirrups, then click here.
For the calculation procedure, go through the following steps.👇
Let us calculate the cutting length of the 4-legged stirrups as shown below.
Column size = 600mm × 450mm.
Clear cover = 40mm.
Rebar diameter = 20mm.
No. of rebars = 8nos.
Stirrup bar dia. = 8mm.
Note: In 4-legged stirrups, the cutting length of stirrup-1 and stirrup-2 are the same, so we will find out the cutting length of a single stirrup.
The cutting length of the stirrup-2 :
The cutting length of the stirrup-2
= [ {(2nos. × (a +b )) +( hook length)} - {90° bend + 135° bend} ]
Here,
a = [2X + (2nos. × 1/2× dia. of rebar) + (2nos. × 1/2 dia. of stirrup bar.)]
First, we will calculate X where,
X = [column width - {(2nos.× cover) +( 2nos.× dia. of stirrup bar ) +(2nos.×1/2 dia. of rebar)}] ÷ 3
= [ 450mm - {( 2nos. × 40mm ) + ( 2nos. × 8mm ) + ( 2nos. × 1/2 × 20mm )}] ÷ 3
= [ 450mm - { 80mm + 16mm + 20mm }] ÷ 3
= [ 450mm - 116mm ] ÷ 3
= 334mm ÷ 3
= 111.33mm.
Now, inserting the value of X in the calculation of a
a = [(2 × 111.33mm ) + (2nos ×1/2 × 20mm ) + ( 2nos. × 1/2 × 8mm.)]
= [ 222.66mm + 20mm + 8mm ]
= 250.66 mm.
Now, we will calculate the value of b.
b = [column depth - {(2nos. × clear cover) + ( 2nos. ×1/2 × dia. of stirrup bar. )}]
= [ 600mm - { ( 2nos. × 40mm. ) + ( 2nos. × 1/2 × 8mm )}]
= [ 600mm - { 80mm + 8mm }]
= [ 600mm - 88mm ]
= 512mm.
The cutting length of the stirrup-2
=[ {(2nos. × (a +b )) + (hook length )} - {(90° bend ) + (135° bend)}]
Here, 10d is taken for hook length.
We have deducted 2d for 90° bend -3nos., & 3d for 135° bend -2nos. as shown in the above drawing.
= [{( 2nos.× ( 250.66mm + 512mm ) ) + ( 2nos. × 10d ) } - {( 3nos. × 2d ) + ( 2nos. × 3d ) }]
= [{(2nos. × 762.66 mm ) + ( 2nos. × 10 × 8mm ) } - { ( 3nos. × 2 × 8mm ) + ( 2nos. × 3 × 8mm )}]
= [{ 1525.32mm + 160mm } - {48mm + 48mm }]
= [ 1685.32mm - 96mm ]
= 1589.32 mm.
The cutting length of stirrup-1 = the cutting length of the stirrup-2 = 1589.32mm
For BBS & cutting length of all types of structural members, click here.
Thank you for going through these calculation steps❤. Have a good day 😄.
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