campbell scientific 2013 usu pile driving instrumentation
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2013 USU Pile Driving
Pile Instrumentation
Dynamic Vibrating Wire Measurements
Introduction
Outline
• Campbell Scientific Background
• Pile Instrumentation
– Sensors
– Lateral Loading
– Pile Driving
• Data
– Collection
– Real Time Viewing
• Questions
Campbell Scientific Inc.
Founded 1974
Data Acquisition Systems and Sensors
– Quality Measurements
– Rugged, Reliable
– Support
Training
– General programming for DAQ
– Infrastructure instrumentation
CR5 (1975)
Datalogger
CR1000 (2005)
Datalogger
CDM-305
Dynamic Vibrating Wire Reader
Representative Projects
Bridges – Tappan Zee
– Brooklyn
Foundations – Minneapolis I-35
Dams – Wolf Creek
– TVA
Slope Stability – Kennecott
– I-70
0
500
1000
1500
2000
2500
3000
3500
4000
4500
2/4/08 3/5/08 4/4/08 5/4/08 6/3/08 7/3/08 8/2/08 9/1/08
Load (K
ips)
Sh2Lev1
Sh2Lev2
Sh2Lev3
Sh2Lev4
Begin
Footing
Construction
Begin
Column
Construction
Begin Box Girder Segment
Cantilevering
Closure jacking to
close 3" gap
Removal of false
work under span 1
I-35 Foundation Response
6 month time history
Bottom of shaft.
Soft rock
Competent rock
Surface
Applications generally driven by users – Owners
– Researchers
– Engineers
– Regulators
Systems are like legos – Rugged
– Flexible
Geotechnical Instrumentation
Typical System
2013 PDPI Instrumentation Goals
Lateral pile test
– Load
– Deflection
– Vertical Load Test
Pile Driving
– Gauge Survival
– Observations
Lateral Monitoring
Monitoring Equipment
– CR1000 Datalogger
– AVW200 Vibrating
Wire Interface
– Multiplexer
Instruments
– Tiltmeter
– Stringpot
– Inclinometer
– Strain Gauge
Dynamic Pile Monitoring
Monitoring Equipment
– Laptop
• Observe live data
• Record Data
– CDM-VW305
• Dynamic Vibrating Wire Interface
– Sample Rate: 20Hz to 333Hz
– Geokon Vibrating Wire Strain
Gauges
Vibrating Wire for Pile Driving
Vibrating Wire, never used dynamically
Campbell CDM-VW300
– 20-333 MHz
Geokon 4000 series gauges
Test Objectives
– Sensor durability
– See what we see
DVW Tool
PC Based
– Live Graphs, PC based acquisition
Data Acquisition and Logging
Collect during testing
Campbell Real Time
Monitoring and Control
(RTMC)
Static data on CR1000
Dynamic data on PC
Static Axial RTMC Dashboard
Static Lateral RTMC
Output
-50
0
50
100
150
200
250
-0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1
L
O
A
D
K
I
P
s
DISPLACEMENT Inches
AXIAL DISPLACEMENT vs LOAD
Geokon_3000
Output Data
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
0 20 40 60 80 100 120 140 160 180 200
DIS
PL
AC
EM
EN
T (
INC
HE
S)
LOAD (KIPs)
DIAL GAGE READINGS VS STRING POTENTIOMETER MEASUREMENTS
Potentiometer Average
Dial Gage Average
-2.5
-2
-1.5
-1
-0.5
0
0.5
0 5 10 15 20 25 30
Dis
pla
ce
me
nt (in
ch
es)
Load (KIPS)
LATERAL LOAD VS DISPLACEMENT
Top…Bottom…
Output Data
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
0 20 40 60 80 100 120 140 160 180 200
DIS
PL
AC
EM
EN
T (
INC
HE
S)
LOAD (KIPs)
DIAL GAGE READINGS VS STRING POTENTIOMETER MEASUREMENTS
Potentiometer Average
Dial Gage Average
Output Data
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
0 20 40 60 80 100 120 140 160 180 200
DIS
PL
AC
EM
EN
T (
INC
HE
S)
LOAD (KIPs)
DIAL GAGE READINGS VS STRING POTENTIOMETER MEASUREMENTS
Potentiometer Average
Dial Gage Average
Data Analysis
Data will be provided on Friday
Thank You
Questions
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