1 Analysis of Test Results 2 What we’ll have to do: Load-Deflection curve. Load Vs Strain curve...
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Transcript of 1 Analysis of Test Results 2 What we’ll have to do: Load-Deflection curve. Load Vs Strain curve...
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Analysis of Test Results
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What we’ll have to do:
• Load-Deflection curve.
• Load Vs Strain curve for steel and concrete
• Find yield load (s = 0.002) for flexural rebar and strain at failure load for concrete and rebar.
• First yield load for flexural reinforcement.
• Ductility of the slab.
• Energy absorption.
• Deflection profile.
3
• Calculate flexural strength and Punching shear capacity of the slab.
• Compare test result with predicted result.
• Show a photograph depicting the crack pattern at failure.
• Make comment on the mode of failure of the slab.
4
Tension Reinforcement and Strain gauges arrangement
T1(1050,845);T2(1260,1020);T3(1460,845);T4(1590,1020);T5(810,1080)
T1
T2
T3
T4T5
1900
1900
5
Compression Reinforcement and Strain gauges arrangement
C6(820,770); C7(1090,820); C8(820,580); C9(820,400)
C9
C8
C7C6
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Concrete Strain gauge locations
5
4
3
2
1
30, 70, 100, 100
7
Load-Deflection curve
Load vs Central Deflection
0.0
50.0
100.0
150.0
200.0
250.0
-40.0 -30.0 -20.0 -10.0 0.0 10.0 20.0 30.0 40.0
Deflection (mm)
Lo
ad
(K
N)
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Load vs Central Deflection
0.0
50.0
100.0
150.0
200.0
250.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0
Deflection (mm)
Lo
ad (
NK
)
Load-Deflection curve
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Load-Deflection curve
Load vs Central deflection
0.0
50.0
100.0
150.0
200.0
250.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0
Deflection (mm)
Lo
ad
(K
N)
10
Load vs Strain curve for steel and concrete
Load vs Strain in Steel (T2)
0.0
50.0
100.0
150.0
200.0
250.0
-500 0 500 1000 1500 2000 2500
Micro-Strain
Lo
ad (
KN
)
11
Load vs Strain curve for steel and concrete
Load vs Strain in steel (T2)
0.0
50.0
100.0
150.0
200.0
250.0
-500 0 500 1000 1500 2000 2500
Micro-Strain
Lo
ad (
KN
)
12
Load vs Strain in steer (T2)
0.0
50.0
100.0
150.0
200.0
250.0
-500 0 500 1000 1500 2000 2500
Mocro-Strain
Lo
ad
(K
N)
Load vs Strain curve for steel and concrete
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Load vs Strain curve for steel and concrete
Load vs Strain in Concrete(3)
0.0
50.0
100.0
150.0
200.0
250.0
-2500 -2000 -1500 -1000 -500 0
Mocro-strain
Lo
ad
(K
N)
14
Load vs Strain curve for steel and concrete
Load vs Strain in Concrete (3)
0.0
50.0
100.0
150.0
200.0
250.0
-2500 -2000 -1500 -1000 -500 0
Micro-Strain
Lo
ad
(K
N)
15
Load vs Strain curve for steel and concrete
Load vs Strain in Concrete (3)
0.0
50.0
100.0
150.0
200.0
250.0
-2500 -2000 -1500 -1000 -500 0
Micro-Strain
Lo
ad
(K
N)
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Steel Strain Distribution
100 KN
150 KN
200 KN
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Concrete Strain Distribution
50 KN
100 KN
150 KN
200 KN
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• Find yield load (s = 0.002) for flexural rebar and strain at failure load for concrete and rebar.
• First yield load for flexural reinforcement.
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Ductility and Energy Absorption of the Slab
Ductility = Ratio of the deflection at 25% of maximum load (after reaching the maximum load) to the deflection at the first yielding of flexural reinforcement.
Energy Absorption = Area under the load deflection curve up to 25 % maximum load (after reaching the maximum load)
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Ductility and Energy Absorption of the Slab
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Deflection Profile
1 division = 0.01 mm
1 cycle = 1 mm
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Calculation of Flexural strength
cyyo
oflex
ffdfM
ca
sK
KMP
'2 /59.01
172.08
tesrcylinderfromf
mmd
MPaf
or
c
y
__
120
400
0.15.0
'
23
Calculation of Punching Shear Capacity
dccb
dbfV
o
occu
22
4.0
21
'
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Compare Test result with Predicted result
Pflex Pv Ppred. Ptest Ptest/Ppred.
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Show a photograph depicting the crack pattern at failure and Make
comment on the mode of failure of the slab
flex
test
P
P If 1 , Flexural failure
If 1 , Punching Shear failure
From crack pattern
Make comment on mode of failure
