Calculating the cutting length of diamond stirrups in column by regular method./ Cutting length of diamond lateral tie in column.

If you are looking for a readymade calculator for diamond stirrups, then click here.

 For the calculation procedure, go through the following steps.👇

Diamond stirrup cutting length as per IS 2502.  Back 👈 Part 1

Let us now calculate the cutting length of a diamond stirrup as shown below.

Given data:

Column width = 600mm,

Column depth = 500mm.

Clear cover = 40mm.

The diameter of stirrup bar = d = 8mm. 

The cutting length formula for diamond stirrup

= [(4H) +(2nos × hook length) - {(2nos. × 135° bend) + (3nos.× 90° bend )}]

I have given a diamond stirrup drawing showing H, a & b

Here,

 H =√( a/2 )2 +( b/2 )2

( H is the hypotenuse of a triangle.)

First, we will calculate the value of a & b 

a = [ column depth - (2nos.× clear cover) - ( 1/2 × 2nos. × dia. of the stirrup bar).]

   = [ 500mm - (2nos.× 40mm) - ( 1/2 × 2nos. × 8mm) ]

    = [ 500mm - 80mm - 8mm ]

    = 412mm.

b =  [ column width - (2nos.× clear cover) - (1/2 × 2nos. × dia. of the stirrup bar).]

   = [ 600mm - (2nos.× 40mm) - (1/2 × 2nos. × 8mm) ]

    = [ 600mm - 80mm - 8mm ]

    = 512mm.

Now, 

        H =√( a/2 )2 +( b/2 )2 

           =√( 412/2 )2 +( 512/2 )2

=√( 206 )2 +( 256 )2

=√ 42436 + 65536

=√107972

= 328.59 mm.

The cutting length of diamond stirrup by the regular method

= [(4H) +(2nos × hook length) - {(2nos. × 135° bend) + (3nos.× 90° bend )}]

   Note:

1. Here,10d is taken for hook length.

2. We have deducted 2d for 90° bend -3nos., & 3d for 135° bend -2nos. ]

= [(4 × 328.59) + ( 2nos. ×10d ) - {( 2nos × 3d ) + ( 3nos × 2d )}]

= [ 1314.36mm + ( 2nos × 10 × 8mm ) - {(2nos × 3 ×8mm ) + (3nos × 2 × 8mm )}]

= 1314.36mm + 160mm - { 48mm + 48mm}]

= 1474.36mm - 96mm

=1378.36mm.= 1.378m

The cutting length of the diamond stirrup is calculated as per IS- 2502 for the same given data so that you can compare the difference between the cutting length in these two ways of calculation.

1. Cutting length of the diamond stirrup by the regular method = 1.378m

2. Cutting length of the diamond stirrup as per IS-2502 = 1.484m

The difference in cutting length = 0.106m

i.e. 7.69% more as per IS-2502.

 

  For BBS & cutting length of all types of structural members, click here.  

Share: