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AS3600 - 2019 2nd Draft For Public Comment

AS3600 - 2019 2nd Draft For Public Comment

AS3600 - 2019 2nd Draft For Public Comment

(OP)
This should be available for download from Australian Standards mid next week. Nominally Tuesday, but who knows!
Replies continue below

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RE: AS3600 - 2019 2nd Draft For Public Comment

great news. I look forward to it

RE: AS3600 - 2019 2nd Draft For Public Comment

Thanks Doug, The PDF doesn't seem to be free for me. Perhaps because I'm outside of Australia.

RE: AS3600 - 2019 2nd Draft For Public Comment

I'm in the same boat, Cooper.

Oddly enough, other drafts accessed through my first link allow me to download PDF versions for free. I guess we wait until it gets posts through sapc.standards.org.

RE: AS3600 - 2019 2nd Draft For Public Comment

8.2.4.3 is wrong or have I misunderstood? [Edit: Checked against AS 5100.5. The AS 3600 draft is wrong as noted below.]
  • Commas missing before kv in both items (a) & (b)? [Tabs are missing cf AS 5100.5]
  • Upper limit of 1.10 in (a) should be a lower limit of... not sure, maybe 0.15 to match item (b)? [Upper limit should be 0.10 according to AS 5100.5]
[I won't bother reporting this. I like to watch the world burn and surely someone will misinterpret the 1.10 limit as conservative at some stage.]

RE: AS3600 - 2019 2nd Draft For Public Comment

I've just gone straight to the shear sections because I was aware they were a major change, and this is pretty disappointing for a second public draft. It's just typos but so sloppy; might need to make a submission after all (or SAI could proof-read their drafts...)

  • 8.2.4.2.1 items (a) and (b) are both listed as applying to Asv/S < Asv.min/S, whereas (b) should presumably be the greater-than-or-equal-to provision.
  • 8.2.4.2.1(a) items (i) and (ii)are both listed as applying to f'c <= 65 MPa, whereas (ii) should presumably be > 65 MPa.

On a technical note, it appears that the simplified one-way shear rules are very conservative for thin slabs. 0.10*sqrt(f'c) in the draft (once corrected) compared with 0.17*sqrt(f'c) which was previously accepted, eg AS5100.5-2004 and Warner et al 'Concrete Structures' textbook. I might request that the simplified rules include something specifically for slabs - probably just needs the old Beta.1 factor or similar.

RE: AS3600 - 2019 2nd Draft For Public Comment

(OP)
steveh49,

You should try being on the committee! There other recently introduced errors in those areas that you have not picked up as well, and they were correct in the last draft I saw early Feb. Somehow they were changed in the interim by the ghosts!

RE: AS3600 - 2019 2nd Draft For Public Comment

(OP)
steveh49

Also do not assume AS5100 is correct, changes are in the system to get it right as well.

RE: AS3600 - 2019 2nd Draft For Public Comment

None of the above links work for me, also going directly to sai global isn't working. Anyone found a way?

RE: AS3600 - 2019 2nd Draft For Public Comment

The code isn't listed on the Standards Australia list of open drafts. It only lists drafts that can be commented on using that list. As it explains AS3600 must have a different way to submit comments, as described in the document. It looks like you have to get it through the store which isn't free for me.

RE: AS3600 - 2019 2nd Draft For Public Comment

The link to Standards Australia below (and in my post yesterday) is to the comments page for AS 3600:
https://sapc.standards.org.au/sapc/secure/commenti...

It has a button which links to the SAI Global store where the pdf is available for free download (at least in Australia). It also has a paper copy available for sale at $85.

I don't know why it isn't listed on the AS general list of documents open for comment; perhaps because its supposed to be close to the final document to be published in the near future.

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: AS3600 - 2019 2nd Draft For Public Comment

Thanks IDS, but when I get to the SAI page it won't allow me to select anything except the hardcopy for $85. Click on PDF in drop-down menu but only hardcopy remains as option.

Cheers
Toby

RE: AS3600 - 2019 2nd Draft For Public Comment

Can public still submit comments as the document has a title "Combined Postal Ballot/Draft for Public Comment Australian Standard" ? My understanding is no more public comments at postal ballot stage ?

RE: AS3600 - 2019 2nd Draft For Public Comment

(OP)
Yes, it is open for public comment.

RE: AS3600 - 2019 2nd Draft For Public Comment

Note the change in Clause 13.1.2.4. The use of development length to develop less than the yield strength should only in regions where full yield strength is not required. Thus, in potential hinge forming regions, one should not use development length to develop less than yield. This is to ensure that concrete structures have sufficient ductility at collapse since bond failure (before reaching yield) is brittle and sudden. AS 5100.5 will need to follow this. AS 5100.5 will need to be changed to follow this.

RE: AS3600 - 2019 2nd Draft For Public Comment

Correction was made to clauses 8.2.7.1(1) and 8.2.7.1(2) in the most recent draft. The missing strength reduction factor phi was added before V_us. The missing gamma_p was added before P_v. phi and gamma_p are also missing in the current version of AS5100.5-2017. That has to be corrected.

RE: AS3600 - 2019 2nd Draft For Public Comment

(OP)
Kww2008

You have to submit comments to Australian Standards. There is a standard from for this.

AS5100 has an amendment coming out for the problems in shear. I am not involved in that so do not now all that they have changed.

RE: AS3600 - 2019 2nd Draft For Public Comment

Does the public get to comment on the commentaries? Figure C8.1.10.6 has more than its fair share of errors in the 2014 commentary.

RE: AS3600 - 2019 2nd Draft For Public Comment

(OP)
Steveh49

It went out to public review before it was printed.

Doesn't look to good does it.

Make up a list of the errors you can spot (I have seen about 4 in a quick look now). Let me know and I will pass it on for inclusion in the next draft.

RE: AS3600 - 2019 2nd Draft For Public Comment

I'll be honest: I missed the publication of the commentary by about two years. In fairness to myself though, after 4 years I'd given up looking out for it. Are you able to say why it took so long? I'd have thought it would practically be written when the standard itself is released, since any changes have been thoroughly researched and have a sound, explainable basis.

The only error that's not cosmetic is that the requirement of clause 8.1.10.6(c) is ignored. The more than one-quarter of the positive moment reinforcement is shown terminating at a point near the simple support instead of being spread over 2D. I presume the same happening at the continuous support is OK given it's on the compression face at that point but the wording of the standard isn't 100% clear to me.

Otherwise: Positive reinf referred to as negative; negative reinf has a gap but should be continuous across whole span.



RE: AS3600 - 2019 2nd Draft For Public Comment

(OP)
Noticed the cosmetic ones. Does not say a lot for the editors and stylists.

Re 8.1.10.6(c), Agreed it does not comply, but I think the justification would be that 25% could have been terminated much earlier, but no sensible engineer would terminate multiple times so the 1st 25% termination point has been extended to be at the same location as the second where a total of 50% has been terminated. This clause is a deemed to comply requirement for the for reinforcement termination based on the real clause 10.4 which also has the 25% termination rule, but it is based on terminating at the point where the reinforcement is no longer required by calculation of strength and development requirements rather than a deemed to comply requirement.

I also do not like end support being shown as a masonry wall and no development of top reinforcement as the deemed to comply case. Most beams would terminate at a column and require proper top reinforcement detailing.

Cannot comment on reasons for the release delay. Most people in the industry know what went on!

RE: AS3600 - 2019 2nd Draft For Public Comment

FYI folks,

I just checked where you submit comments on the Standards Australia website and code committee has now filled in the responses; accepted, rejected etc to any comments you may have submitted. I found they were quite receptive to the comments raised which is great to see.

RE: AS3600 - 2019 2nd Draft For Public Comment

Matt,

Could you please copy/paste them here? Or post a screenshot?

I can't seem to access the page you're talking about. Cheers.

RE: AS3600 - 2019 2nd Draft For Public Comment

(OP)
Apparently the new code is being released on Friday 29/6!

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