Post on 15-Jul-2020
Dr Munaz Ahmed Noor, BUET 1
Dr Munaz Ahmed Noor, BUET 2
Dr Munaz Ahmed Noor, BUET 3
ASTM A 615, Specification for Deformed and Plain Carbon-SteelBars for Concrete Reinforcement (Both Grade 75, 60 and 40)
ASTM A 706, Specification for Low-Alloy Steel Deformed and PlainBars for Concrete Reinforcement (Grade 60)
ASTM A 996, Specification for Rail-Steel and Axle-Steel DeformedBars for Concrete Reinforcement
AATM A 1035 Standard Specification for Deformed and Plain,Low-carbon, Chromium, Steel Bars for Concrete Reinforcement(New in ACI 318-08)
ASTM A 955, Standard Specification for Deformed and PlainStainless-Steel Bars for Concrete Reinforcement (New in ACI 318-08)
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– 1.1.9.1The seismic design category of a structure shall bedetermined in accordance with the legally adopted generalbuilding code of which this Code forms a part, ordetermined by other authority having jurisdiction in areaswithout a legally adopted building code
– 1.1.9.2 All structures shall satisfy the applicable provisionsof Chapter 21 except those assigned to Seismic DesignCategory A (lowest in USA) and those otherwise exemptedby the legally adopted general building code. See 21.1.1.
In 2008, the provisions of Chapter 21 wererevised
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y yt
y
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s
fyt
fyt
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y yt
y yt
y
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(a) The actual yield strength based on mill tests does notexceed fy by more than 18,000 psi; and
(b) The ratio of the actual tensile strength to the actual yieldstrength is not less than 1.25.
yt
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yt
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c
y
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Stress - Strain Curve
Sample 1 of 16 mm dia bar
0
100
200
300
400
500
600
700
800
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Strain (mm/mm) x 10-2
Str
ess
(MP
a)
G-500
G-400
Dr Munaz Ahmed Noor, BUET 18
Stress - Strain Curve
Sample 1 of 20 mm dia bar
0
100
200
300
400
500
600
700
800
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Strain (mm/mm) x 10-2
Str
ess
(MP
a)
G-500
G-400
Dr Munaz Ahmed Noor, BUET 19
Stress - Strain Curve
Sample 1 of 32 mm dia bar
0
100
200
300
400
500
600
700
800
0.0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0
Strain (mm/mm) x 10-2
Str
ess
(MP
a)
G-500
G-400
Dr Munaz Ahmed Noor, BUET 20
s s s
s y
Es can be taken equal to 29,000,000 psi (ACI 8.5.2).
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Investigate use of high-strength bars as primary,secondary, and confining reinforcement.
Address development length and anchorage issues
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–
–
–
–
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TensionCompression
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TensionCompression
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Force Vs Displacement (f'c=3ksi)
0
5
10
15
20
25
30
0 1 2 3
Displacement, in
Fo
rce
,k
ips
60 grade
75 grade
Force Vs. Displacement (f'c=5ksi)
0
5
10
15
20
25
30
0 1 2 3
Displacement, in
60 grade
75 grade
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Note: This calculation is only based on strength point of viewserviceability is ignored.
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2 2
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c
y
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