Get Grade D500N reinforcing bar properties for AS 3600:2018: yield strength, elastic modulus, strains and bar area per metre. Try it free on CalcTree.
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About this D500N Reinforcing Bar Properties Calculator
This page gives the properties of Grade D500N deformed reinforcing bar to AS/NZS 4671, as AS 3600:2018 uses them in Clause 3.2: the characteristic yield strength, the modulus of elasticity, the yield strain and the minimum uniform strain for ductility Class N. Enter a bar diameter and spacing to get the area of one bar and the area per metre width.
- Structural engineer references the page from beam, slab and wall checks so the steel properties live in one place.
- Graduate engineer looks up the D500N values and their clause references while learning reinforced concrete design.
- Detailer converts a bar size and spacing into the area per metre that a design calls for.
It is an engineering-grade CalcTree page built to be referenced: map its diameter and spacing to your own design check and the results flow through.
More info on D500N Reinforcing Bar Properties
Material properties
The characteristic yield strength and the minimum uniform strain are the D500N values of Table 3.2.1, and the modulus of elasticity is the value Clause 3.2.2 takes for all reinforcement. The yield strain follows from the yield strength over the modulus.
Bar areas
The area of one bar is worked from its nominal diameter, and the area per metre width from the bar area and the centre-to-centre spacing, for a single layer of bars.
Why Class N matters
D500N is ductility Class N, the class the full capacity reduction factors of Table 2.2.2 assume. Class L reinforcement, typically mesh, has different capacity reduction factors and strain limits and is not covered on this page.
Common Calculation Errors to Avoid
- Using Class N values for mesh misstates both the strain limit and the capacity reduction factor. Mesh is usually Class L.
- Doubling up layers by accident inflates the area. The area per metre is for one layer at the spacing given.
- Using the actual rib diameter instead of the nominal diameter gives a bar area the design does not assume.
- Applying these values to stainless or prestressing steel is not valid. Those have their own properties.
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FAQs
What does D500N mean?
D stands for deformed bar, the number is the strength grade set by the characteristic yield strength, and N is ductility Class N (normal ductility) to AS/NZS 4671.
Where does the modulus of elasticity come from?
AS 3600:2018 Clause 3.2.2 takes one modulus of elasticity for all reinforcement, and the page uses it to work out the yield strain.
How is the area per metre worked out?
The area of one bar, from its nominal diameter, is divided by the centre-to-centre spacing. The result is for a single layer of bars.
Can I use this page in my own design check?
Yes. Reference it from a beam, slab or wall check and map the diameter and spacing to your own values, so the properties are defined once.
Does it cover Class L mesh?
No. Class L reinforcement has different capacity reduction factors and strain limits, and stainless and prestressing steel are also outside its scope.
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