Stirrup Length Calculator for Beam and Column Reinforcement
Calculate stirrup cutting length for rectangular, square, circular, diamond and custom stirrups using member size, clear cover, bar diameter, hook length and bend deduction.
Beam और column stirrup की cutting length निकालें। Width, depth, clear cover, bar diameter और hook type डालकर practical BBS output प्राप्त करें।
Formula Preview
CL = 2(A + B) + Hook - Bend Deduction
Example
For 230 × 450 mm beam, 25 mm cover:
A = 180 mm, B = 400 mm
What is Stirrup Length?
Stirrup length is the total cutting length of a reinforcement bar required to form a stirrup or tie. It includes effective perimeter, hook length and bend deduction.
Hindi Explanation
Stirrup length bar की actual cutting length होती है जिससे beam या column में stirrup बनाया जाता है। इसमें clear cover, hook length और bend deduction का ध्यान रखा जाता है।
Where to Use?
Use it for beam stirrups, column ties, footing ties, lintel bars, seismic reinforcement, confinement reinforcement and BBS checking.
Stirrup Length Formula
The stirrup cutting length depends on the shape of the stirrup, clear cover, bar diameter, hook type and bend deduction. For rectangular beam stirrups, effective dimensions are first calculated after deducting clear cover from both sides.
Rectangular Stirrup
Cutting Length = 2(A + B) + Hook Length - Bend Deduction
Used for most beam stirrups and rectangular column ties.
Square Stirrup
Cutting Length = 4A + Hook Length - Bend Deduction
Used for square column ties and square reinforcement cages.
Circular Stirrup
Cutting Length = πD + Hook Length
Used for circular columns, piles and circular reinforcement cages.
Effective Size
A = Width - 2 × Clear Cover, B = Depth - 2 × Clear Cover
Effective stirrup dimensions are calculated after deducting clear cover from both sides.
Example Stirrup Length Calculation
Given Data
Beam width = 230 mm
Beam depth = 450 mm
Clear cover = 25 mm
Stirrup bar diameter = 8 mm
Hook type = 135° hook = 6d
Hook ends = 2
Bend deduction = 3 × 2d
Calculation
A = 230 - 2 × 25 = 180 mm
B = 450 - 2 × 25 = 400 mm
Perimeter = 2(180 + 400) = 1160 mm
Hook length = 2 × 6 × 8 = 96 mm
Bend deduction = 3 × 2 × 8 = 48 mm
Cutting Length = 1160 + 96 - 48 = 1208 mm
Inputs Required
Output You Get
Stirrup Length in BBS
Beam Stirrups
Beam stirrups are used to resist shear and hold main bars in position. Correct cutting length helps reduce wastage.
Column Ties
Column ties provide confinement to vertical bars. Tie length depends on column size, clear cover and hook requirement.
Seismic Detailing
In ductile detailing, 135° hooks are commonly used in ties and stirrups for better confinement and anchorage.
Related Steel Calculators
Use these related tools for complete reinforcement and BBS checking.
Stirrup Length Calculator FAQs
What is stirrup length?
Stirrup length is the cutting length required to bend a reinforcement bar into a stirrup or tie shape for beams, columns or footings.
What is the formula for rectangular stirrup cutting length?
For a rectangular stirrup, a common formula is Cutting Length = 2(A + B) + Hook Length - Bend Deduction, where A and B are effective width and depth after clear cover deduction.
How is clear cover used in stirrup length calculation?
Clear cover is deducted from both sides of the member size. Effective width = Width - 2 × Clear Cover and effective depth = Depth - 2 × Clear Cover.
Why is hook length added in stirrup cutting length?
Hook length is added because stirrups usually have hooks at their ends to provide proper anchorage and confinement.
Why is bend deduction subtracted?
Bend deduction is subtracted because bending a bar changes the effective cutting length. It helps prepare a more practical BBS cutting length.
Where is stirrup length calculation used?
It is used in beam stirrups, column ties, footing reinforcement, seismic detailing and bar bending schedule preparation.
Can this calculator be used for column ties?
Yes. Stirrup length calculation is also used for column ties, especially rectangular and square column reinforcement.
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