Advanced_Design_Columns.pdf
(
1123 KB
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Pobierz
SEMINARS
Sept. 2001
ADVANCED DESIGN™ OF
COLUMNS
Professor Russell Bridge
Dr Andrew Wheeler
Centre for Construction Technology and Research
University of Western Sydney
The Centre for Construction Technology and Research at the University of
Western Sydney is progressively developing new design rules for OneSteel
Reinforcing’s
Guide to Reinforced Concrete Design
.
Top-tier design rules that meet the requirements for design by refined
calculation defined in AS 3600-2001 are being released under the trademark of
Advanced Design™. This presentation concerns rules being developed for
advanced design of reinforced-concrete column cross-sections for strength.
The design rules are proprietary and should only be used when OneSteel
Reinforcing’s products are specified.
1
OneSteel Reinforcing
OSR491
ADVANCED DESIGN™ OF COLUMNS
500PLUS-CCS
SOFTWARE
COLUMN
CROSS
SECTION
DESIGN
The advanced design rules have been incorporated in a new software package
called 500PLUS-CCS, “CCS” standing for “Column Cross-Section” which
will be demonstrated during the presentation.
The new design rules and software will provide the user with a better
determination of cross-section strength and allowing the safe and economical
use of higher strength materials.
The presentation looks at the design principles used in the determination of the
cross-sectional strength of a conventionally reinforced column.
Also presented are the principles used in advanced analysis which was used in
the development of the software package 500PLUS-CCS.
2
LOAD-MOMENT STRENGTH INTERACTION - DESIGN
f
N
u
Locus of
f
M
u
,
f
N
u
values
f
N
u0
N*
M*
(
M*, N*
)
(Unsafe)
(
M*, N*
)
(
Safe
)
(
f
M
ub
,
f
N
ub
)
f
M
u
Moment
f
M
uo
In the design of a reinforced concrete column the designer is primarily
concerned with obtaining a column for which the design action effects
(defined by combination of M*, N*) fall within the load-moment strength
interaction diagram. Typical load-moment strength interaction diagrams as
shown may be generated using either simplified methods or using advanced
analysis. The 500PLUS-CCS software enables the designer to use advanced
analysis methods to derive an accurate interaction diagram for design use.
The load moment strength interaction diagram is dependent on a number of
factors including the geometry of the cross-section, and the material properties
of both the concrete and reinforcement. One of the major advantages of the
advanced analysis is the ability to accurately predict the stress in a cross
section for a give strain distribution, thus providing an accurate means for
determining realistic column capacities.
3
CONCRETE AND STEEL MATERIALS
Concrete
•
Four original Grades;
new Grade
;
high strength
•
f
¢
c
= 25, 32, 40, 50 MPa;
65 MPa
;
up to 90 MPa
•
Maximum Strength = 0.85
f
¢
c
Steel
•
500N grade - 500PLUS
(
f
sy
= 500MPa)
The Australian concrete structures code AS 3600 has previously limited the
maximum concrete strength of the concrete to 50 MPa, and an upper limit of
400 MPa on the nominal yield strength of the reinforcement. However, the
current standard AS 3600-2001 has increased the maximum concrete strength
to 65 MPa and allows the use of 500N grade reinforcement (yield stress
500MPa). In recognition of the industry need and based on current research,
the advanced analysis software also enables the use of high strength concrete
up to 90 MPa.
4
CONCRETE STRESS-STRAIN CURVE (CEB)
60
AS3600-2001
f'
c
= 65 MPa
s
c
=
f
(
e
a
)
50
f'
c
= 50 MPa
40
f'
c
= 40 MPa
f'
c
= 32 MPa
30
f'
c
= 25 MPa
20
10
e
o
=
0.0022
0
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
Strain
e
a
To define the concrete stress-strain relationship, the current commentary to the
standard recommends the use of the CEB curve when using advanced analysis
methods.
One key factor of the CEB curves is that the peak stress occurs at a strain of
0.002 and is independent of the concrete cylinder strength. The unloading
behaviour of the varying grades of concrete also differ significantly.
The standard also limits the maximum concrete stress of 85% of the cylinder
strength.
5
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