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Concrete Column Designer to AS3600

This calculator allows the user to assess the structural integrity of concrete columns to ensure compliance with the Australian Standard AS 3600. The calculation will identify the design capacities of concrete columns to meet axial, flexural and shear design requirements to Ultimate Limit State (ULS) methods.
❗ This calculation has been written in accordance with AS3600:2018.
Column cross-section with symbols used in this calculator


📃 List of symbols used in this calculator

Calculation

Technical notes

  1. The calculator does not calculate second order effects of slender columns, it assumes the input design bending moment (M*) takes into account any second order effects.
  1. Currently you can only input rectangular sections in the calculator.

Inputs

Material Properties



γc
:24 kN / m3​



f'c
:40MPa​



Ec
:32.8 GPa​



Es
:200 GPa​



fsy
:500 MPa​



Loads



N*
:30 MN​



V*
:50 kN​



M*
:350 kN m​



Section and Reinforcement Geometry



Lu
:6 m​



D
:600 mm​



b
:600 mm​


Tensile Reinforcement, Ast:


Tensile reinforcement diameter
:32 mm​



Number of tensile reinforcement bars
:4​


Compressive Reinforcement, Asc:


Compressive reinforcement diameter
:32 mm​



Number of compressive reinforcement bars
:4​


Shear Reinforcement:


Stirrup diameter
:12 mm​



Spacing of legs
:200 mm​



Number of legs
:2​

Cover:


Exposure classification
:A2​



Formwork and compaction method (1)
:Self-compacting concrete​



Design life
:60 years​

Using a design life of 120 years requires additional 5mm cover


cst
:30 mm​



csc
:30 mm​

This cover distance is to the surface of the first steel reinforcement, either longitudinal or shear, from top and bottom concrete fibres.


Column Restraints

AS 3600:2018 Figure 10.5.3(A) - effective length factor (k) for columns with simplified end restraints

End #1


Rotation - #1
:Fixed​



Translation - #1
:Fixed​

End #2


Rotation - #2
:Fixed​



Translation - #2
:Fixed​





Output

Section Properties



Ag
:360000mm2​



Zx
:36000000mm3​



Zy
:36000000mm3​



Ixx
:10800000000mm4​



Iyy
:10800000000mm4​




Ast
:3217mm2​



Asc
:3217mm2​



Area of shear reinforcement, Asv
:226mm2​



Total minimum cover
:20mm​



dst
:542mm​



dsc
:58mm​



Distance to centroid of shear reinforcement, dsv
:564mm​



Column and Slenderness Properties



k
:0.7​



Le
:4200mm​



r
:180mm​



sr
:23.33​



Column classification
:Braced, Short​


Column Strength Checks

Interaction Curve (combined flexural and axial check)



(M*, N*) < Interaction curve
:FAIL​

Squash Load


SL - ϕ
:0.65​



SL - φNuo
:9905kN​

Decompression Point


DP - ku
:1​



DP - ϕ
:0.6​



DP - ϕNu
:6398.4kN​



DP - ϕMu
:594.8kN m​

Balanced Point


BP - ku
:0.54545​



BP - ϕ
:0.6​



BP - ϕNu
:2892kN​



BP - ϕMu
:960kN m​

Pure Bending


PB - kuo
:0.135​



PB - ϕ
:0.85​



PB - ϕMu
:689kN m​





Flexural Checks



ϕMu / M*
:0.36​



ϕMu > M*
:PASS​


Minimum moment check:


Mu,min
:163.93kN m​



M* > Mu,min
:PASS​


Longitudinal reinf. check:


As,min
:3600.0mm2​



As,max
:14400.0mm2​



As > As,min
:PASS​



As ≤ As,max
:PASS​

As,min = 1% of Ag
As,max = 4% of Ag
Ductility check:


kuo
:0.1347​



kuo < 0.36
:PASS​




Shear Checks



θ
:36degree​



bv
:600mm​



dv
:432mm​



kv
:0.15​



Vuc
:245.9kN​



Vus
:336.2kN​



ϕVu
:436.6kN​



V*/ϕVu
:0.11​



ϕVu > V*
:PASS​

Minimum shear reinf. check:


Minimum Asv/s
:0.607mm2/mm​



Asv/s
:1.131mm2/mm​



Asv/s > Asv/s,min
:PASS​