View
219
Download
1
Tags:
Embed Size (px)
Citation preview
APPLICATION OF ACOUSTIC EMISSION FOR MASONRY ASSESSMENT
University of Salford
Clive Melbourne Adrienn Tomor
AE instrumentation
AE test results
Static loading
Dead load Live load
Live load
Live load
Live load
Dead load
Dead load
Dead load
Dead load Live load
Dead load Live load
Dead load Live load
Dead load Live load
AE2
AE5
AE7
AE4
AE8
AE1
AE3
AE6
Am
pli
tud
e (d
B)
Load (kN)
Static loading
AE2
AE5
AE7
AE4
AE8
AE1
AE3
AE6
AE3
AE4
AE1
AE2
AE8
AE7
AE6
AE5
Am
pli
tud
e (d
B)
Load (kN)
Static loading
AE2
AE5
AE7
AE4
AE8
AE1
AE3
AE6
AE3
AE4
AE1
AE2
AE8
AE7
AE6
AE5
1st crack2nd crack
Ring separationRing separation
Am
pli
tud
e (d
B)
Load (kN)
Static loading
AE test results
Cyclic loading
AE2 AE4
AE1 AE3
Noise from loading system
Noise from loading system
Am
pli
tud
e (d
B)
Am
pli
tud
e (d
B)
AE 1
AE 2
AE 4
AE 3Time (s) Time (s)
Crackdevelopment
Cyclic loading
AE test results
Energy release
Ab
solu
te e
ner
gy
(aJ
)
Load (kN)
Load (kN)
300,000,000
250,000,000
200,000,000
150,000,000
100,000,000
50,000,000
0
0 5 10 15 20 25 30
300,000,000
250,000,000
200,000,000
150,000,000
100,000,000
50,000,000
0
300,000,000
250,000,000
200,000,000
150,000,000
100,000,000
50,000,000
0
0 5 10 15 20 25 30
300,000,000
250,000,000
200,000,000
150,000,000
100,000,000
50,000,000
0
22kN 28kN
AE1
AE2
AE3
AE4AE5
AE6
Energy release
Movement
Crack development
Crack opening
AE test results
Damaged arches
Abs. Energy / Cycle
AE Absolute Energy / Cycle
0
10000
20000
30000
40000
50000
60000
70000
14kN
1cyc
16kN
1cyc
16kN
1000000cyc
18kN
1cyc
18kN
1000000cyc
20kN
1cyc
20kN
1000000cyc
22kN
1cyc
22kN
1000000cyc
24kN
1cyc
24kN
1000000cyc
26kN
1cyc
26kN
1000000cyc
28kN
1cyc
28kN
1000000cyc
30kN
1cyc
30kN
1000000cyc
32kN
1cyc
32kN
1000000cyc
34kN
1cyc
34kN
1000000cyc
36kN
230cyc C
RA
CK
Loading history
Hit Rate / Cycle
AE Hit Rate / Cycle
0
50
100
150
200
250
14kN
1cyc
16kN
1cyc
16kN
1000000cyc
18kN
1cyc
18kN
1000000cyc
20kN
1cyc
20kN
1000000cyc
22kN
1cyc
22kN
1000000cyc
24kN
1cyc
24kN
1000000cyc
26kN
1cyc
26kN
1000000cyc
28kN
1cyc
28kN
1000000cyc
30kN
1cyc
30kN
1000000cyc
32kN
1cyc
32kN
1000000cyc
34kN
1cyc
34kN
1000000cyc
36kN
230cyc C
RA
CK
36k
N
32k
N
34k
N
Damaged arches
AE test results
Arches with soil
Arches with soilA
bso
lute
en
erg
y (
aJ)
Time (sec)
Cra
ck d
evel
opm
ent
Mov
eme
nt
Cra
ck d
evel
opm
ent
Mov
eme
nt
1st crack observed at ¼ span
AE technique summary
1. AE gives real-time indication of crack opening inside the structure, before their effect is measurable on the surface
2. Can clearly locate damaged regions and potential areas of failure
3. Indicates crack development and residual damages before failure
4. Shows potentials for damaged arches as well as for arches with soil.
5. Periods of ‘crack development’, ‘crack opening’ and ‘movement’ can be clearly distinguished