bugbus
Structural
- Aug 14, 2018
- 515
Here is a quick comparison of AS 3600 and AS 5100.5 regarding provision for high strength (> 500 MPa) reinforcement:
AS 3600 (including up to Amendment 2 as of 2021)
AS 5100.5 (including up to Amendment 2 as of 2024)
Does anyone know the reason for these differences? It seems AS 5100.5 is less conservative in some areas (e.g., allowing 750 MPa for shear strength) but more conservative in others (e.g., requiring column fitments to be deformed bars).
The reason this came up is that there are some higher strength reinforcement products coming onto the market in the last few years, including:
Sense 600:
Viribar 750:
Unfortunately, however, the Viribar 750 product is a plain bar and so is not allowed for use in columns by AS 5100.5. This would have been a nice thing to have on a recent project where we were forced to go back to D500N fitments on some pretty congested columns.
AS 3600 (including up to Amendment 2 as of 2021)
- Scope allows for reinforcement up to 800 MPa, with a limit of 600 MPa to be assumed for ultimate limit states unless noted otherwise
- No exemptions for shear and torsion strength (i.e., must assume 600 MPa as above)
- Specific exemption to allow 800 MPa for column confinement calculations
- No requirement for column fitments bars to be deformed
AS 5100.5 (including up to Amendment 2 as of 2024)
- Scope allows for reinforcement up to 750 MPa, with a limit of 600 MPa to be assumed for ultimate limit states unless noted otherwise
- Specific exemption to allow 750 MPa to be used for shear reinforcement (but funnily not mentioned for torsion, though this seems to be an oversight?)
- Specific exemption also to allow 750 MPa for column confinement calculations
- Column fitments are required to be deformed bars (Clause 10.7.6.2.1)
Does anyone know the reason for these differences? It seems AS 5100.5 is less conservative in some areas (e.g., allowing 750 MPa for shear strength) but more conservative in others (e.g., requiring column fitments to be deformed bars).
The reason this came up is that there are some higher strength reinforcement products coming onto the market in the last few years, including:
Sense 600:
Viribar 750:
Unfortunately, however, the Viribar 750 product is a plain bar and so is not allowed for use in columns by AS 5100.5. This would have been a nice thing to have on a recent project where we were forced to go back to D500N fitments on some pretty congested columns.