Developed by InfraBuild, Viribar™750 is a new range of high-strength reinforcing steels for column fitments.
Viribar™750 has 33% less mass than that of 500N standard fitments. The use of Viribar™750 is more sustainable, delivers savings in fixing, transport and cranage costs and is recognised by Australia’s peak sustainability bodies for construction, the Green Building Council of Australia (GBCA) and the Infrastructure Sustainability Council of Australia (ISCA), with the potential to significantly improve the sustainability credentials of construction projects.
Produced in Equivalent Force Capacity diameters to make the direct substitution for 500N fitments easy with no redesign requirements for the general case, Viribar™750 conforms to Australian Standards and is compliant to the National Construction Code (NCC) because it conforms to the Building Code of Australia (BCA).
Recognised by the GBCA and ISCA
The Green Building Council of Australia (GBCA) Green Star rating tool and the Infrastructure Sustainability Council of Australia (ISCA) Infrastructure Sustainability (IS) tool both reward a reduction in material consumption. The GBCA also offers an automatic additional point under its Innovation Credit 30A for using only Viribar™750 fitments on a reinforced concrete project, subject to meeting eligibility criteria. Innovation points may also be available for the IS tool as a result of the innovative method by which the Viribar™750 is produced.
Lower transport, handling and fixing costs, energy savings
The weight savings realised by the use of Viribar™750 fitments deliver potential savings for activities that are costed based on weight. These include:
- lower transport and handling costs
- reduced site storage requirements
- lower fixing costs
The lighter product also offers opportunities for more energy savings from transport and cranage.
Reduced safety risk
The potential to reduce the mass of each bundle and thus lighter lifts will result in fewer back injuries and reduce other on-site risks.
Directly substitutable for Standard 500N fitments, with no redesign costs; reduced raw material and energy inputs in manufacture; lower transport, handling and fixing costs and energy savings resulting from reduced mass: together, these add up to ensure Viribar™750 fitments are a cost effective alternative to Standard 500N fitments.
Viribar™750 key features and benefits:
Viribar™750 comes in sizes that allow it to be directly substitutable for Standard 500N fitments. It conforms to:
- AS/NZS 4671:2019
- AS 3600:2018
- the Building Code of Australia and hence the National Construction Code
Grade and ductility
Viribar™750 comfortably meets the requirements of the Australian Standard AS/NZS 4671 750 MPa, Ductility Class N reinforcing bar.
As Viribar™750 is directly substitutable for 500N Standard Fitments, in the general case a standard 500N fitment can be substituted with the equivalent Viribar™750 fitment without re-engineering, incurring no redesign costs.
Because Viribar™750 uses less raw material and energy to produce, it is more sustainable than the alternative 500N Standard Fitments. This reduction in raw material and energy use in production leads to a potential embodied energy and greenhouse warming saving of approximately 33%.
The Viribar™750 range
Viribar™750 is available in diameters that have the Equivalent Force Capacity to standard 500 MPa bars, making the designer’s job easy. For example:
- The standard 500 MPa diameter bar has a force capacity of 39.3 kN. The equivalent Viribar™750 is 8.2mm diameter, giving it exactly the same force capacity of 39.3 kN
- For a column fitment, an N10 can be directly substituted with an 8.2mm Viribar™750, designated V8.2
- Similarly, there are Equivalent Force Capacity diameter Viribar™750s for N12 and N16 500 MPa steels, specifically a V9.8 and V13.
Note: Viribar™️750 is currently only available in Sydney metro areas
This calculator is provided to allow users to compare Viribar™ 750 fitments to standard 500 MPa diameter fitments.
To use, select the required tab below -
- Viribar™750 Substitution will determine the equivalent Viribar™750. Just select the 500N bar (N10, N12, N16) to be substituted
- AS 3600 Cl. 14.5.4 allows you to check the substitution, if required, for compliance to AS 3600 Cl. 14.5.4. If the column is designed as part of an earthquake resisting frame the calculator will advise if there needs to be an adjustment to the fitment spacing. Just enter the required parameters to check
Conditions of Use
The information provided in the calculator is a service to those interested in Steel Reinforcement. Since the information is general only and in no way replaces the services of a professional consultant, no legal liability can be accepted for its use by InfraBuild Construction Solutions. InfraBuild Construction Solutions reserve the right to change specifications and availability without notice.
Copyright ©2020. All rights reserved. InfraBuild Construction Solutions ABN 22 004 148 290
Applying AS 3600:2018 Clause 10.7 allows, in the general case, Viribar™750 fitments in equivalent force diameters to be directly substituted for 500N fitments. The calculator below provides the details of the equivalent Viribar™ 750 fitment for each 500N fitment. Where the column is part of an intermediate moment-resisting frame Clause 14.5.4 will also need to be checked.
N Diameter (mm)
V Diameter (mm)
N Force Capacity (kN)
V Force Capacity (kN)
N Area (mm2)
V Area (mm2)
N Weight (kg/m)
V Weight (kg/m)
Spacing, S (mm)
Viribar V750 alternative
Column Minimum Dim., D (mm)
Spacing, Se (mm)
Clear Height, Lu (mm)
Critical Length, x (mm)
Check Cl14.5.4 for IMRF?
Total Weight (Tonnes)
Total Weight (Tonnes)
For more information about Viribar™750, including how to specify it, download the Viribar™750 brochure below. For technical information and FAQs, download the Viribar™750 Technical Note below. For specific enquiries, please complete the form here and one of our team will be in touch shortly.