Special confinement for columns in AS3600
Special confinement for columns in AS3600
(OP)
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.
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.





RE: Special confinement for columns in AS3600
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).