Special confinement for columns in AS3600

[asixth]

I don't like the all or nothing approach of the special confinement requirements in AS3600.

I agree with the no special requirements under fc=50MPa and a confinement of 0.1*fc above 0.75*phi*Nuo. But I think it should have an intermediate confinement requirement between these two values of 5MPa. Please see the attached diagram.

 

[rapt]

Asixth,

You still need confinement in those areas based on the general confinement rules in clause 10.7.4 and table 10.7.4.3. It is just not based on a strength calculation as is required for the Special Confinement zones in Fig 10.7.3.1(A).