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DR AS 3600:2018 Amd 2:2020, Amendment 2 to AS 3600 - Concrete structures
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Project ID: 105479
Draft
Australian Standard™
Public Comment is invited for:
DR AS 3600:2018 Amd 2:2020, Amendment 2 to AS 3600 — Concrete
structures
Public comment period:
Start date:
7 September 2020
Close date:
9 November 2020
To submit comments please use the following link
https://sapc.standards.org.au/sapc/public/listOpenCommentingPublication.action
During their development process, Australian Standards are available in draft form
during the public consultation period to allow any interests concerned with the
application of the proposed Standard to review the draft and submit their comments.
This draft is liable to alteration. It is not to be regarded as an Australian Standard ®
until finally published as such by Standards Australia.
Upon successful conclusion of the Public Comment period, it is proposed to publish
this as AS 3600:2018.
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Committee: BD-002
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DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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How to submit comments
Committee BD-002—Concrete Structures
Draft
Australian Standard
DR AS 3600:2018 Amd 2:2020, Amendment 2 to AS 3600:2018 —
Concrete structures
This document is a draft Australian Standard only and is liable to alteration. It is not
to be regarded as an Australian Standard until finally published as such by
Standards Australia.
Upon successful conclusion of the Public Comment period, it is proposed to publish
this as AS 3600:201X.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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STANDARDS AUSTRALIA
1
DRAFT ONLY
STANDARDS AUSTRALIA
Amendment No. 2
to
AS 3600:2018
Concrete structures
REVISED TEXT
The 2018 edition of AS 3600 is amended as follows; the amendments should be inserted in the appropriate
places.
SUMMARY: This Amendment applies to the Table of contents, Global change, Clauses 1.1.2. 1.7, 2.1.2,
2.5.2.2, 3.1.1.1, 3.3.4.2, 4.10.2, 4.10.3.2, 5.3.1, 5.6.3, 5.7.4.1, 6.2.7.1, 8.1.4, 8.1.5, 8.2.1.2, 8.2.1.3, 8.2.1.5,
8.2.1.6, 8.2.1.7, 8.2.3.1, 8.2.3.2, 8.2.3.3. 8.2.3.4, 8.2.4.1, 8.2.4.2.1, 8.2.4.2.2, 8.2.4.2.3, 8.2.4.3, 8.2.5, 8.2.5.4,
8.2.5.5, 8.2.7, 8.2.8.1, 8.2.8.2, 8.3.2.2, 8.3.3, 8.4.3, 8.6.1, 8.6.2.2, 8.6.2.3, 9.5.1, 9.5.2.1, 9.5.3.2, 10.7.3.1,
10.7.4.3, 11.2.1, 11.6.1, 11.6.3, 11.7.4, 11.7.5, 12.5, 12.5.1, 12.5.2, 12.6, 13.1.2.2, 13.1.2.3, 13.1.2.7, 13.3.3,
13.3.2.4, 14.2.10, 14.5.4, 14.6.7, 16.1, 16.3.3.4, 16.4.2, 16.4.4.2.1, 16.4.7.2.1, 17.6.2.5, 17.7.2, 18.8, 21.3.1
and 21.3.2, Equations 8.2.4.2.2(1), 8.4.3, 14.6.6 and 18.4(2), Tables 2.2.2, 2.2.5, 2.5.2.3(B), 3.1.1.1, 3.1.2,
3.2.1, 5.6.3, 5.6.4, 5.7.2, 8.6.3 and 13.1.2.3, and Figure 18.8.
Published on .
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Table of contents
Under Appendices, delete ‘D’ and replace with ‘C’.
Global change
Delete ‘Dc’ and replace with ‘b’ in all instances.
Clause 1.1.2
Item (a)(i) insert ‘cylinder’ between ‘characteristic’ and ‘compressive’.
Clause 1.7
1
In the definition for ‘Ac’ delete ‘(see Clauses 5.6.3 and 7.2.3)’ and replace with ‘(see
Table 5.6.4 and Clause 7.2.3)’.
2
In the definition for ‘b’ delete ‘wall thickness (see Table 5.7.2)’ and replace with
‘smaller column cross-sectional dimension if rectangular, or the column diameter if
circular (see Table 5.6.3, Table 5.6.4 and Clause 10.7.4.3)’.
3
In the definition for ‘bv’ delete ‘Clause 8.2.6’ and replace with ‘Clause 8.2.1.5’.
4
Add the following:
CMOD
=
crack mouth opening displacement (see Clause 16.2.1)
COD
=
crack opening displacement (see Clause 16.2.2)
5
Delete ‘Dc’ including definition.
6
In the definition for ‘df’ delete ‘Paragraph C4.2.2, Appendix C’ and replace with
‘Clause 14.5.2.2’.
7
In the definition for ‘Ds’ insert ‘; or’ after the words ‘drop panel’.
8
Insert definition for d v as follows:
dv
9
=
effective shear depth
In the definition for ‘e’ delete ‘or’ and replace with ‘or’.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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10
In the definition for ‘fR,2m’ delete ‘strengths’ and replace with ‘strength’.
11
Add the following:
fR,4m
=
mean residual flexural tensile strength corresponding to a CMOD of
3.5 mm, determined in accordance with Clause 16.3.3.7’
12
In the definition for ‘ f cp ’ delete ‘is the’.
13
Delete the definition for ‘ f w ’ and replace with the following:
‘characteristic residual tensile strength of SFRC corresponding to a COD w’.
Add the following:
14
H
=
15
In the definition for p , delete ‘(see Clause 2.5.2.3)’ and replace with ‘(see
Clause 2.5.2.3); or’.
16
Add second definition for p, (next line) as follows:
=
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overall wall height
load factor for vertical component of prestress (see Clause 8.2)
Clause 2.1.2
In the first paragraph, second sentence delete ‘when determining the static earthquake load
for the structure to be able to resist the remainder of the earthquake loading inelastically’.
Table 2.2.2
Delete the fourth row and replace with the following:
(d)
Bending with axial compression, where—
(i)
N u  N ub
0.65k 
(ii)
N u < N ub
0.65 + [(   0.65) (1  N u/N ub)]k 
and  is obtained from Item (b)
Short columns with Q/G  0.25,
k  = 1.0, otherwise, k  = 12/13
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Table 2.2.5, Note
Delete ‘Larger values than’ and replace with ‘Values larger than’.
Clause 2.5.2.2
Delete clause text and replace with the following:
Except where otherwise stated in the Standard, stress resultants from the effects of
prestressing shall be included with a load factor of unity in load combinations for both
ultimate and service design.
For the case of permanent action plus prestressing force at transfer, the more severe of the
following shall be used:
(a)
1.15G  1.15P; or
(b)
0.9 G  1.15P.
NOTE: See also Clauses 6.2.6 and 8.2.1.3.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
This is a draft document made available by Standards Australia to the registered licensee solely for review in providing public comment.
Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
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3
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Clause 2.5.2.3
1
Delete Clause title and replace with ‘Actions and load combinations for fatigue’.
2
Third paragraph, delete ‘values’ and replace with ‘value’.
Table 2.5.2.3(B)
Delete table title and replace with ‘REPRESENTATIVE VALUE FACTOR FOR
PRESTRESS ( p)’.
Clause 3.1.1.1
Delete clause text, including title, and replace with the following:
3.1.1.1 Characteristic compressive strengths
(a)
The characteristic cylinder compressive strength of concrete at 28 days ( f c ) shall be
either—
(i)
taken as equal to the specified strength grade, provided that curing is ensured
and that the concrete conforms with AS 1379; or
(ii)
determined statistically from compressive cylinder strength tests carried out in
accordance with AS 1012.9.
The characteristic compressive cylinder strengths of the standard strength grades are
20 MPa, 25 MPa, 32 MPa, 40 MPa, 50 MPa, 65 MPa, 80 MPa, 100 MPa and
120 MPa.
(b)
 ) shall be—
The characteristic cube compressive strength of grout at 28 days ( f c.cube
(i)
taken as equal to the specified strength grade, provided that curing is ensured
and that the grout conforms with AS 1379; or
(ii)
determined statistically from compressive cylinder strength tests carried out in
accordance with AS 1012.9 and converted to cube strength using Table 3.1.1.1;
or
(iii) determined statistically from compressive cube strength tests carried out in
accordance with AS 1012.9.
The cube strength test result shall be modified to an equivalent cylinder strength in
accordance with Table 3.1.2.
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No. 2
Table 3.1.2
Delete the table, including title, and replace with the following:
TABLE 3.1.2
RELATIONSHIP BETWEEN CYLINDER AND
CUBE STRENGTH AT 28 DAYS
fc
20
25
32
40
50
65
80
100
25
30
40
50
60
80
95
120
MPa

f c.cube
MPa
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Table 3.2.1
Row 6, column 3, delete ‘650’ and replace with ‘500’.
Clause 3.3.4.2
Delete the second paragraph.
Clause 4.10.2
Second paragraph, delete ‘an’.
Clause 4.10.3.2
Delete clause title and replace with ‘Required cover where standard formwork and
compaction are used ’.
Clause 5.3.1
Add new Note 2 as follows (number existing note as ‘1’):
2
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No. 2
4
Eurocode 2 Part 1.2 Amendment 1 Annex C provides tabulated data for the fire design of a
range of slender reinforced concrete columns in braced and un-braced structures. The data in
these tables is based on the calculation methods recommended in Note 1.
Clause 5.6.3
1
Item (f), delete ‘reinforcement’ and replace with the following:
‘Longitudinal reinforcement As ≤ 0.04Ag’.
2
After the definition to ‘lo.fi’ delete the line ‘Values for lo .fi < 2 metres are conservative
for lo .fi = 2 metres’ and replace with the following:
‘When lo.fi < 2 m, it is conservative to take lo.fi = 2 m in Equation 5.6.3(2)’.
3
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No. 2
In the definition for , delete ‘Ac’ and replace with ‘Ag’.
Table 5.6.3
1
Columns 3, 5, 7 and 9 of row 4 of headings, delete ‘Dc’ and replace with ‘b’.
2
Legend, delete ‘Dc’ and replace with ‘b’.
Table 5.6.4
1
Heading, second column, delete ‘Ac’ and replace with ‘Ag’.
2
Delete ‘( Dc)’ and replace with ‘(b)’ throughout the table.
3
Legend, delete ‘Dc’ and replace with ‘b’.
Table 5.7.2
1
First row of heading delete ‘b’ and replace with ‘tw’.
2
Fourth row of headings, delete ‘b’ and replace with ‘tw’, in all instances.
3
Legend, delete ‘b’ and replace with ‘tw’.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
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5
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Clause 5.7.4.1
First line of the second paragraph, delete ‘b’ and replace with ‘tw’.
Clause 6.2.7.1
Item (d), delete ‘OCD’ and replace with ‘COD’.
Clause 8.1.4
Delete Clause text and title and replace with the following:
Dispersion angle of prestress and concentrated forces
In the absence of a more exact calculation, the dispersion angle when a concentrated load is
applied to a bearing surface shall be assumed to be 60 (i.e. 30 either side of the line of
action of the concentrated load).
NOTE: This clause includes the dispersion angle of a prestressing force applied at an anchorage.
Splitting forces that arise from dispersion of a concentrated force shall be designed in
accordance with Section 7. Alternatively, the provisions specified in Clause 12.5 shall be
applied.
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No. 2
Clause 8.1.5
Item (b), delete ‘8.1.11.7 and 8.1.11.8’ and replace with ‘8.3.1.6 and 10.7.4’.
Clause 8.2.1.2
1
First paragraph, delete ‘8.2.5.4’ and replace with ‘8.2.5.5’.
2
Definition for ‘bv’, delete ‘8.2.1.4’ and replace with ‘8.2.1.5’.
3
After the definition for ‘by’ insert the following:
‘Aoh — area enclosed by the centre-line of the exterior closed transverse torsion
reinforcement, including area of holes (if any).
For solid sections, Ao shall be taken as equal to 0.85Aoh.’
4
Delete Equation 8.2.1.2(4) and replace with the following:
Veq*  V * 
5
T *d s
2 Ao sin  w
After the definition for ds insert the following:
w =
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No. 2
smallest angle of the exterior webs measured to the horizontal
Clause 8.2.1.3
Delete clause text and replace with the following:
‘Where the factored vertical component of prestress γpPv is included in Clause 8.2,
including its sub-clauses, where Pv acts to reduce the shear stress resultant, Pv is positive
and γp = 0.90. Where Pv acts to increase the shear stress resultant, Pv is negative and
γp = 1.15.’
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
This is a draft document made available by Standards Australia to the registered licensee solely for review in providing public comment.
Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
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No. 2
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6
DRAFT ONLY
Clause 8.2.1.5
Second sentence, delete ‘dd  bw/8’ and replace with ‘dd  bw/8’.
Clause 8.2.1.6
Delete clause text and title and replace with the following:
8.2.1.6 Requirements for transverse shear and torsional reinforcement
Transverse reinforcement shall be provided in all regions where:
(a)
V *   p Pv  ksVuc
. . . 8.2.1.6(1)
where
if D  300 mm, ks = 1.0;
if 300 mm < D < 650 mm, ks = (1000  D)/700; and
if D  650 mm, ks = 0.5
and p is given in Clause 8.2.1.3.
Irrespective of the above, when it is shown by rational calculation satisfying conditions of
equilibrium and compatibility that a shear failure of the structural component under
consideration will not cause collapse of the structure, ks may be taken as 1.0.
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No. 2
(b)
T *  0.25Tuc
. . . 8.2.1.6(2)
(c)
The overall depth of the beam or one-way slab is D  750 mm
. . . 8.2.1.6(3)
Clause 8.2.1.7
Delete the first sentence and replace with the following:
‘Where transverse reinforcement is required, the minimum area (Asv.min) provided in a
concrete beam or slab shall be calculated from the following equation:’.
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No. 2
Clause 8.2.1.9
Delete clause text and replace with the following:
‘The effective shear depth (dv) shall be taken as the distance between the resultants of the
tensile and compressive forces due to flexure at the section considered but not less than the
greater of 0.72D or 0.9d, where d is the effective depth to the centroid of the tensile force.’
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No. 2
Clause 8.2.3.1
Delete clause title and text and replace with the following:
8.2.3.1 Design strength of a beam in shear and torsion
The design shear strength of a beam (Vu) shall satisfy the following:
Vu V *   p Pv
. . . 8.2.3.1(1)
where
Vu  Vuc  Vus
and
Vuc = determined from Clause 8.2.4
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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7
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Vus = determined from Clause 8.2.5
Pv = vertical component of prestress crossing the section under consideration
(see Clause 8.2.1.3)
p
= prestress load factor determined in accordance with Clause 8.2.1.3
The design torsional strength of a beam ( Tus) shall satisfy the following:
Tus  T *
. . . 8.2.3.1(2)
In addition—
 Vu. max Veq*   p Pv
. . . 8.2.3.1(3)
where Vu.max is given in Clause 8.2.3.3.
NOTES:
1 Values for  are given in Table 2.2.2.
2 Transverse reinforcement calculated for shear and
Clause 8.2.5.3).
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No. 2
for torsion are additive (see
Clause 8.2.3.2
1
At the end of the Clause add the following:
‘Notwithstanding the above, the maximum transverse shear at the face of the support
shall be used to satisfy Clause 8.2.3.3.’
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No. 2
2
Item (b) and Item (b)(ii), delete ‘do’ and replace with ‘dv’.
3
Second line of the paragraph after (b)(ii), replace ‘2do’ with ‘2dv’ in two instances.
Clause 8.2.3.3
Delete clause title and text and replace with the following:
8.2.3.3 Shear and torsional strength limited by web crushing
The combined shear and torsional strength at a cross-section is limited by the shear force
when web crushing occurs (Vu.max) given by—
 cot  v  cot  v 
Vu.max  0.55 f c bv d v 
 ; or
2
 1  cot  v 
. . . 8.2.3.3(1)
 cot  v  cot  v 
Vu.max  0.55 f cp bv d v 
 at transfer
2
 1  cot  v 
. . . 8.2.3.3(2)
where
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No. 2
dv
= effective shear depth (see Clause 8.2.1.9)
v
= angle of inclination of the compressive strut (see Clause 8.2.4.2)
av
= angle between the inclined reinforcement and the longitudinal tensile
reinforcement
Clause 8.2.3.4
Delete clause.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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8
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Clause 8.2.4.1
Second paragraph, first, second and third lines, delete text and replace with the following:
‘where f c shall not exceed 8.0 MPa. The value of kv and the concrete strut angle v 
shall be determined in accordance with the general method of Clause 8.2.4.2. Alternatively,
for non-prestressed components not subject to axial tension or torsion,’.
AMDT
No. 2
Clause 8.2.4.2.1
1
Delete the first line and replace with ‘The value of kv and v shall be calculated as
follows:
2
Item (a), insert Equation 8.2.4.2(1A), as follows:
 v   29  7000 x  , in degrees
3
AMDT
No. 2
AMDT
No. 2
Clause 8.2.4.2.2
1
Second paragraph, delete ‘Where  x as calculated above is less than zero’ and
replace with ‘Where  x as calculated above is less than zero (i.e. compression),’
2
Item (a) delete ‘Pv’ and replace with ‘pPv’
Equation 8.2.4.2.2(1)
Delete Equation 8.2.4.2.2(1) and replace with the following:
x 
AMDT
No. 2
M * d v  V *   p Pv  0.5 N *  Apt f po
2  Es Ast  E p Apt 
 3.0  103
Equation 8.2.4.2.2(2)
Delete equation 8.2.4.2.2(2) and replace with the following:
x 
AMDT
No. 2
Item (b), delete text and Equation 8.2.4.2.1(5) [equation transferred to Item (a)]
M * d v  V *   p Pv  0.5 N *  Apt f po
2  Es Ast  Ep Apt  Ec Act 
within the limits -0.2  10 3   x  0
Clause 8.2.4.2.3
1
Paragraph immediately after Note 2, delete ‘do’ and replace with ‘dv’ in two places.
2
Delete Equation 8.2.4.2.3(1) and replace with the following:
M*
x 
dv

V
*
  p Pv


2
2
 0.9T *u h 
*

  0.5 N  Apt f po
2
A
o 

2 Es Ast  E p Apt

 3.0  103
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
. . . 8.2.4.2.3(1)
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Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
3
9
Delete Equation 8.2.4.2.3(2) and replace with the following:
x 
4
V
M*

dv
*
  p Pv


2
2
 0.9T *u h 
*

  0.5 N  Apt f po
2
A
o 

2 Es Ast  E p Apt  Ec Act
. . . 8.2.4.2.3(2)

Delete Equation 8.2.4.2.3(3) and replace with the following:
*
M  dv
5
DRAFT ONLY
V
*
  p Pv

2
 0.9T *uh 


 2 Ao 
2
. . . 8.2.4.2.3(3)
Note 1. delete note text and replace with the following:
‘fpo may be taken as 0.5fpb or p.ef for bonded tendons outside of the transfer length
and p.ef for unbonded tendons.’
AMDT
No. 2
Clause 8.2.4.3
Delete ‘The angle of inclination of the compression strut (θv) may be taken as 36°’ and
replace with the following:
‘For normal weight concrete with f c'  65 M Pa , the angle of inclination of the compression
strut (θv) may be taken as 36°’.
AMDT
No. 2
Clause 8.2.5
Delete the title and replace with the following:
‘Transverse shear and torsion reinforcement contribution’
AMDT
No. 2
AMDT
No. 2
Clause 8.2.5.4
Delete clause.
Clause 8.2.5.5
Delete clause text and replace with the following:
Where torsional reinforcement is required as specified in Clause 8.2.3.1 or where torsional
strength is not required for the equilibrium of the structure and Clause 8.2.1.2 applies—
AMDT
No. 2
(a)
longitudinal torsional reinforcement shall be provided in accordance with
Clauses 8.2.7 and 8.2.8; and
(b)
minimum transverse reinforcement shall be provided to satisfy the greater of—
(i)
the minimum shear reinforcement required by Clause 8.2.1.7 in the form of
closed ties or fitments; and
(ii)
a torsional capacity equal to 0.25Tcr, where Tcr is calculated using
Equation 8.2.1.2(2).
Clause 8.2.7
Delete clause text and title and replace with the following:
Additional longitudinal tension forces caused by shear and torsion
The additional longitudinal force required for shear and/or torsion on each of the tensile and
compressive sides shall be as follows:
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
(a)
10
DRAFT ONLY
For solid sections:
Ftd  cot  v
2  0.45T *u
h
V *  0.5Vus   p Pv  
 1.7 Aoh







2
8.2.7(1)
, but not less than zero
where Aoh is defined in Clause 8.2.1.2.
(b)
For box sections:
Ftd  Veq*  0.5Vus   p Pv  cot  v , but not less than zero
8.2.7(2)
where p is given in Clause 8.2.1.3 and  determined from Table 2.2.2, Item (e).
AMDT
No. 2
Clause 8.2.8.1
Delete the first sentence and replace with the following:
‘Reinforcement shall be provided to resist the sum of the tension forces including tension
caused by flexure, shear, torsion and applied forces, and is shown in Figure 8.2.8.’
AMDT
No. 2
Clause 8.2.8.2
1
Delete the first sentence and replace with the following:
‘An area of reinforcement and tendons shall be provided to resist the total tension
force at every section calculated from—’
2
Delete text following Equation 8.2.8.2(1) and replace with the following:
‘but not more than that required at the section with the maximum tension force
demand for flexure, axial force and torsion. In Equation 8.2.8.2(1),
(i)
z is the internal lever arm between the centroids of the resultant flexural
compression force acting on the section and the resultant flexural tension force;
(ii)
N* is taken as positive for tension and negative for compression; and
(iii) Ftd need not be taken greater than
AMDT
No. 2
0.45T *ub
.
2 Ao
Clause 8.3.2.2
Delete the first paragraph and replace with the following:
‘Shear reinforcement shall be spaced longitudinally not further apart than 0.5D or 300 mm,
whichever is less. Where V* ≤ Vu.min, the spacing may be increased to 0.75D or 500 mm,
whichever is less.’
AMDT
No. 2
AMDT
No. 2
Clause 8.3.3
Item (b), fifth line, delete ‘0.12ut’ and replace with ‘0.12uh’.
Equation 8.4.3
After Equation 8.4.3, insert ‘≤ lesser of - ( 0.2 f c , 10 MPa)’.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
AMDT
No. 2
11
DRAFT ONLY
Clause 8.6.1
1
Title, delete ‘for reinforced concrete beams’.
2
Third paragraph, delete last line and replace with the following:
accordance with—
(i)
Clause 8.6.2 for reinforced concrete sections and sections containing unbonded
tendons;
(ii)
Clause 8.6.3 for sections containing bonded tendons; and
(iii) Clause 16.4.7.4 for sections containing steel fibres.
Under direct loading, the calculated tensile steel stress (scr.1) shall not exceed 0.8fsy.
Bars with a diameter less than half the diameter of the largest bar in the section shall
be ignored when determining spacing.
3
Delete Notes 1 and 3.
4
Note 2, delete text and replace with the following:
‘Design bending moments at the serviceability limit state will normally be estimated using
elastic analysis. Substantial errors may result where the actual in-service moments are likely
to have redistributed significantly from the elastic distribution.’
AMDT
No. 2
Clause 8.6.2.2
1
Delete initial statement and Item (a) and replace with the following:
‘The calculated steel stress (scr) on the cracked section shall conform with:
(a)
AMDT
No. 2
For beams primarily subject to tension, scr shall not exceed the maximum steel
stress given in Table 8.6.2.2(A) for the largest nominal diameter (db) of the bars
in the section.’
2
Item (b), delete ‘the calculated tensile steel stress (scr)’ and replace with ‘scr’.
3
Delete the Note.
Clause 8.6.2.3
1
Definition for ‘Ac.eff’, delete ‘hc.ef’ and replace with ‘hc.eff’.
2
Delete Equation 8.6.2.3(3) and replace with the following:
S r,max  3.4c  0.3 k1 k 2 d b pp,eff  1.3  D  kd 
3
Definition for ‘db’, add the following:
Where a mixture of bar diameters is used in a section, an equivalent bar diameter
(db.eq) shall be used. For a section with n1 bars of diameter db1 and n2 bars of diameter
db2, the following expression shall be used:
d b.eq 
AMDT
No. 2
n1d b21  n2 d b22
n1d b1  n2 d b 2
Table 8.6.3
Delete table and replace with the following:
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
8.6.2.3(4)
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
12
DRAFT ONLY
TABLE 8.6.3
Nominal bar diameter
(d b )
mm
AMDT
No. 2

wmax
 0.2 mm

wmax
 0.3 mm

wmax
 0.4 mm
12
240
300
350
16
200
260
300
20
170
220
260
24
145
195
225
28
120
185
210
All bonded tendons
120
185
210
Clause 9.5.1
1
Delete ‘reinforced concrete slabs’ from the title.
2
Insert Note 3 as follows:
3
AMDT
No. 2
Maximum increment of steel stress for flexure in prestressed beams
(MPa)
Design bending moments at the serviceability limit states will normally be estimated
using elastic analysis. Substantial errors may result where the actual in-service moments
are likely to have redistributed significantly from the elastic distribution.
Clause 9.5.2.1
After item (b) (before Note) insert the following:
‘The calculated tensile steel stress (scr.1) shall not exceed 0.8fsy’
AMDT
No. 2
Clause 9.5.3.2
Second sentence of Item (b) to be a separate paragraph (relative to whole clause).
The maximum centre-to-centre spacing of bars required to control cracking due to
shrinkage and temperature effects in the primary direction shall conform with
Clause 9.5.1(b).
AMDT
No. 2
Clause 10.7.3.1
1
After the second paragraph of Item (b)(ii) insert the following note:
NOTE: See also Clauses 14.4.3, 14.5.4 and 14.5.5 for additional provisions for members
subject to earthquake actions.
2
Delete designations (aa) and (bb) and replace with (i) and (ii) respectively.
Clause 10.7.4.3
1
Item (b)(i), delete ‘Dc’ and replace with ‘b’.
2
Item (b)(ii), including symbol definition, delete ‘Dc’ and replace with ‘b’ in both
instances.
3
Item (b)(iii), delete ‘Lu  5D’ and replace with ‘Lu  5b’.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
AMDT
No. 2
13
DRAFT ONLY
Clause 11.2.1
At the end of the Clause insert the following:
‘When considering design actions due to earthquake, the determination of whether the
horizontal cross-section of a wall is subject to compression over the entire section shall be
based on a lateral analysis undertaken using a structural ductility factor () of 1.00 and a
structural performance factor (Sp) of 1.0, in accordance with AS 1170.4.’
AMDT
No. 2
AMDT
No. 2
Clause 11.6.1
Delete ‘0.5H w’ and replace with ‘0.5H’.
Clause 11.6.3
Delete introductory statement and equations 11.6.3(1) and 11.6.3(2) of Items (a) and (b) and
replace with the following:
(a)
For H/Lw  1—

H
Vuc   0.66 f c  0.21
Lw

(b)

f c  0.8 Lw t w ; or

. . . 11.6.3(1)
For H/Lw > 1, the lesser of the values calculated from Item (a) above; and—




0.1 f c 

Vuc  0.05 f c 
0.8Lw t w


H
 1 


 Lw


. . . 11.6.3(2)
But not less than 0.17 f c (0.8 Lw t w )
AMDT
No. 2
Clause 11.7.4
Delete clause text and replace with the following:
For walls with concrete strength not exceeding 50 MPa and designed as columns in
accordance with Section 10, the restraint provisions of Clause 10.7.4 are not required if any
one or more of the following conditions is met:
(a)
N*  0.5Nu
(b)
The vertical reinforcement is not used as compressive reinforcement.
(c)
The vertical reinforcement ratio is not greater than 0.01 and a minimum horizontal
reinforcement ratio of 0.0025 is provided.
For walls with concrete strength not exceeding 50 MPa and designed using the
simplified method in accordance with Clause 11.5, no restraint of vertical
reinforcement is required.
For walls with a concrete strength exceeding 50 MPa, which are not designed and
detailed for ductility in accordance with either Clauses 14.6 or 14.7, the core of the
wall shall be confined, and the vertical reinforcement shall be—
(d)
in accordance with Clause 14.5.4 for walls designed as columns in accordance with
Section 10 where N *  0.15 f c Ag and M *  0.6 M u ;
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
AMDT
No. 2
14
DRAFT ONLY
(e)
in accordance with Clause 14.5.4 for walls designed using the simplified method in
accordance with Clause 11.5, where N* in any portion of the wall is greater than
0.5ϕNu; or
(f)
in accordance with Clauses 10.7.3 and 10.7.4 for all other scenarios.
Clause 11.7.5
Delete the second paragraph and replace with the following:
For walls that remain in net compression under either earthquake design actions using a
structural ductility factor (μ) of 1.0 and a structural performance factor (Sp) of 0.77, or any
other loading scenarios (e.g. wind actions), this requirement can be waived.
For walls that do not remain in net compression under either earthquake design actions
using a structural ductility factor (μ) of 1.0 and a structural performance factor (Sp) of 0.77,
or any other loading scenarios (e.g. wind actions), the area of dowel reinforcement shall be
equal to at least 50% of the wall reinforcement in the direction of the dowels, i.e. Ast,dowel 
0.5Ast,wall.
The dowel reinforcement shall always be greater than the amount corresponding to the
minimum reinforcement ratio calculated using Clause 11.7.1, regardless of the above
scenarios.
AMDT
No. 2
Clause 12.5
Delete title and replace with the following:
BEARING ZONES BEHIND CONCENTRATED FORCES AND PRESTRESSING
ANCHORAGES
AMDT
No. 2
Clause 12.5.1
Delete the first sentence and replace with the following:
Components subjected to concentrated forces, including anchorage zones in post-tensioned
concrete members, shall be designed in accordance with Section 7.
AMDT
No. 2
Clause 12.5.2
1
Delete the first paragraph and replace with the following:
Reinforcement shall be provided to carry tensile forces that arise from the action and
dispersal of concentrated loads or prestressing forces in the zone behind the point of
bearing.
AMDT
No. 2
2
First sentence of second paragraph after ‘anchorage’ insert ‘or bearing zone’.
3
In the last sentence of the second paragraph, after ‘anchorages’ insert ‘or bearing
zones’.
4
Last sentence of third paragraph, after ‘anchorage’ insert ‘or bearing zone’.
Clause 12.6
Delete the first paragraph and replace with the following:
Unless special confinement reinforcement is provided, the design uniform bearing stress at
a concrete surface shall not exceed—
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
AMDT
No. 2
AMDT
No. 2
AMDT
No. 2
AMDT
No. 2
AMDT
No. 2
AMDT
No. 2
AMDT
No. 2
15
DRAFT ONLY
Clause 13.1.2.2
Last paragraph, delete ‘Values of k for individual bars are given in Figure 13.1.2.3’.
Clause 13.1.2.3
Symbol K, third definition, delete ‘=’.
Table 13.1.2.3
Table heading, delete ‘k’ and replace with ‘K’.
Clause 13.1.2.7
1
Item (a), delete ‘17.2.3.2’ and replace with ‘17.2.3.3’.
2
Item (c), delete ‘17.2.3.2’ and replace with ‘17.2.3.3’.
Clause 13.3.3
First sentence, delete ‘tensile strength’ and replace with ‘characteristic minimum breaking
strength’.
Clause 13.3.2.4
First sentence, delete ‘tensile strength’ and replace with ‘characteristic minimum breaking
strength’.
Clause 14.2.10
After the last paragraph, insert the following:
‘Short or squat walls, as defined in Clause 14.4.4.4, shall be treated as non-ductile walls in
accordance with Clause 14.3.’
AMDT
No. 2
Clause 14.5.4
1
Delete Item (b) and replace with the following:
 f sy . f 
 times the diameter of the fitment bar’.

 500 
‘24
2
AMDT
No. 2
'
*
'
Fifth paragraph, delete ‘ Pu   0.3Ag fc ’ and replace with ‘ N   0.3Ag fc ’.
Equation 14.6.6
Delete equation and replace with the following:
 1.6 M  *    * 
u
V ;  V 
* 
M
  S p  

Vu  min 
AMDT
No. 2
Clause 14.6.7
1
Fourth paragraph, delete ‘Figure 14.6.7(C)’ and replace with ‘Clause 14.6.7(c)’.
2
Delete items (A), (B), and (C) and replace with the following:
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
16
DRAFT ONLY
(i)
The ends of all horizontal lapped bars within the central two-thirds region of
the wall (i.e. the web region) shall be provided with minimum 135° hooks and
lapped with a full-strength splice [see Figure 14.6.7(D)].
(ii)
At the ends of walls, where boundary elements exist, horizontal bars shall be
provided with hooks or cogs and fully developed and anchored into the
confined concrete core of the boundary element or lapped with U bars with a
lap length equal to 1.2Lsy.t.lap. Where no boundary element is required, or the U
bar provisions of Clause 14.6.2.2 apply, ends of horizontal bars shall be
terminated at the end of the wall with full tension laps with U bars of the same
diameter.
(iii) Ductility Class L reinforcement shall not be used as structural reinforcement.
AMDT
No. 2
AMDT
No. 2
Clause 16.1, Note 2
Delete ‘NCC 2016’ and replace with ‘NCC 2019’.
Clause 16.3.3.4
1
After Item (b) delete ‘k3Dtb’ and replace with ‘k3Dt’
2
Item (g) delete ‘compressive strength
compressive strength  f c ’
AMDT
No. 2
AMDT
No. 2
 f c ’ and replace with ‘characteristic
Clause 16.4.2
Definition for Actu, delete ‘at the ultimate’ and replace with ‘at the ultimate limit state’.
Clause 16.4.4.2.1
1
Equation 16.4.4.2.1(1) delete equation and replace with the following:
Vuf  kS kg d v bv f w cot  v
AMDT
No. 2
AMDT
No. 2
AMDT
No. 2
AMDT
No. 2
2
Under listing of symbol definitions, delete ‘Ks’ and replace with ‘ks’.
3
Definition for kg, delete ‘where area of concrete within the tensile zone (mm2) at
ultimate is calculated as Actu = bvdvcotv’.
Clause 16.4.7.2.1
1
First paragraph, delete 0.6fcm  t  and replace with 0.6fcmi  t  .
2
First paragraph, delete 0.4fcm  t  and replace with 0.45fcmi  t  .
Clause 17.6.2.5
First line, after ‘supports or’ insert ‘backprops’.
Clause 17.7.2
Clause title, delete ‘diaphrams’ and replace with ‘diaphragms’.
Equation 18.4(2)
 and replace with fct .
Delete fct,f
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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Any other use of the document is prohibited. The registered licensee may print once only. Further copying, storage, distribution or use on network is prohibited.
Full licence terms are available at https://www.standards.org.au/home/public-comment-document-licence-agreement.
Standards Australia Limited does not warrant or represent that the draft document is accurate or complete or that it should be relied on for any particular purpose. Any user of the document should rely on the final published version.
DRAFT ONLY
AMDT
No. 2
AMDT
No. 2
17
DRAFT ONLY
Clause 18.8
Paragraph after Equation 18.8(2), delete the words ‘The yield strength should be verified by
tensile tests for the steel used.’
Figure 18.8
Delete the figure, including title, and replace with the following:
18.8 INDICATIVE S-N CURVE FOR REINFORCING STEEL AND TENDONS
AMDT
No. 2
Clause 21.3.1
Delete Items (a) and (b) and replace with the following:
Two-way footings—
(a)
AMDT
No. 2
minimum flexural reinforcement shall be designed in accordance with—
(i)
Section 9; or
(ii)
Section 16;
(b)
 / f sy ; and
minimum tensile reinforcement ratio shall be given by 0.19  D / d  f ct.f
(c)
for fibre reinforced concrete, the minimum fibre dosage shall conform with
Clause 16.3.3.8.
2
Clause 21.3.2
Delete ‘shall be designed in accordance with’ and replace with ‘shall conform with the
requirements of’.
DR_AS_3600_2018_AMD_2_2020 - 03/09/2020 17:25:06
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