AS3600 - Cl 10.7.4.5 Column Joint Reinforcement

[Drapes]

Is this clause only applicable to edge/corner columns that are part of a moment resisting frame building, or edge/corner columns in general?

The SRIA Guide to Seismic Design & Detailing of Reinforced Concrete Buildings in Australia appears to suggest that it is only applicable to OMRF and IMRF (as per excerpt and illustration below), but just wanted to check as the clause itself is not very clear on this point.

 

[Agent666]

It applies to all columns as I read it, not just edge or corner columns.

https://engineervsheep.com

 

[dik]

Neat site... thanks, Agent...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[IDS]

I see nothing in the clause to suggest that the reinforcement is only required for seismic actions. It says it is applicable "Where bending moments from a floor system are transferred to a column", and it is in the general column design section.

It does however say that the fitments may be omitted where there is a slab or beam on all four sides, so it is applicable only to corners and edges.

The SRIA guide was published in 2016, before the current AS 3600, and in any case is specifically about detailing for seismic effects, so not mentioning other load cases does not imply that the shear reinforcement is only required for seismic design.


Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[Agent666]

It does however say that the fitments may be omitted where there is a slab or beam on all four sides, so it is applicable only to corners and edges.

While I see your logic with the literal interpretation, but if you have an internal column with a single beam, then the reinforcement is required. It is noted as 'a slab on all 4 sides', OR 'beams on all four sides'. As soon as you have beams deeper than the slab depth you need 4 beams to not require the reinforcement and they also need to be of similar depth. Other codes have similar requirements regarding confinement of the column over the joint region (this reinforcement is also doing this task).

https://engineervsheep.com

 

[IDS]

Agent 666 - the clause says you can only omit the ligatures over the depth of the thinnest section around the column, but I don't see anything requiring that it must be all slabs or all beams.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[Agent666]

Yeah agree, so for an internal column the requirement still applies if there is a single/double beam, etc (you just don't put them in the thickness of the slab as soon as you have beams). I guess the main point I was trying to make is that it is not a requirement that only applies to external or corner columns as you stated. It also applies to internal columns when beams are present.

It does however say that the fitments may be omitted where there is a slab or beam on all four sides, so it is applicable only to corners and edges.

https://engineervsheep.com

 

[Drapes]

Thanks for all the feedback everyone