driven concrete pile foundation monitoring with …
TRANSCRIPT
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DRIVEN CONCRETE PILE FOUNDATION MONITORING WITH EMBEDDED DATA
COLLECTOR SYSTEM
R O D R I G O H E R R E R A , P . E .
L A W R E N C E E . J O N E S , P . E .
P E T E R L A I , P . E .
I N T E R N A T I O N A L F O U N D A T I O N C O N G R E S S & E Q U I P M E N T E X P O
M A R C H 1 5 - 1 9 , 2 0 0 9
O R L A N D O , F L O R I D A
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Introduction
Majority of Florida bridges are supported on deep j y g pp pfoundations;Most common deep foundation:
Precast Prestressed Concrete piles All test piles are monitored with the PDA
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CURRENT FDOT PRACTICE
Test Pile ProgramgPre-field WEAP PDA CAPWAP Final WEAP
ll d i ilInstall Production Piles
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EMBEDDED DATA COLLECTOR
Alternate method was investigated through FDOT sponsored researchUniversity of Florida’s Final report issued on August 2002issued on August 2002• Theory • First generation hardware and g
software • Construction Project BB349Smart Structures, Inc. holds the license to develop the UF/FDOT patented technology.patented technology.
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WHAT IS EMBEDDED DATA COLLECTOR?
FDOT Design Standard Index 20602
l d lInstruments cast into solid concrete piles;
Two instrumentation levels, pile head and tip
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WHAT IS EMBEDDED DATA COLLECTOR?
Wireless data transfer
lAntenna connects to laptop PC
Monitoring concrete piles during driving; g g;
Estimates soil damping for every blow during driving;
Real time estimates of static Real-time estimates of static resistances, i.e., side, tip and total.
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CALCULATION METHODS
• Fixed Case Method• constant damping (input by operator)
• Dynamic Case Method• dynamic damping (calculated for every hammer blow)
• Paikowsky Method• energy-displacement approach
• UF Methoddynamic damping (calculated for every hammer blow)• dynamic damping (calculated for every hammer blow)
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PURPOSE OF EVALUATION
To compare the EDC to the results from the “gold standard” PDA & CAPWAP;To generate a database of projects using EDC for resistance factor calibration
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EDC EVALUATION
– Phase 1: Compare EDC to PDA and CAPWAP
• EDC data is collected and reported by different engineers than those collecting the PDA data.
• Neither engineer gets to see the other’s data until test pile program is complete and both reports turned in.p g p p
• All project related decisions made based on PDA data and lanalyses.
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EDC EVALUATION
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EDC EVALUATION
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EDC EVALUATION
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EDC EVALUATION
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EDC EVALUATION
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EDC EVALUATION
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DATABASE
Database Files
Paper Current
Bridge Sites 42 46
PDA (.WO1) 122 150
EDC (.ssn) 122 150
CAPWAP 60 74
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EDC EVALUATION
• PDA estimate > 50 tons• PDA estimate > 50 tons• Data within three standard deviations from the mean used
in the development of statistical parametersin the development of statistical parameters
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PDA/EDC STATIC CAPACITY
Population “n” = 116,048 blows from 68 pilesp , 4 p
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PDA/EDC STATIC CAPACITY
Population “n” = 135,569 blows from 76 piles
Ratio of Total Static Resistance
Parameter Fixed Method/PDA UF Method/PDAParameter Fixed Method/PDA UF Method/PDA
% of n 98.7 97.4
Mean 0 97 1 08Mean 0.97 1.08
Median 0.96 1.06
Standard Deviation 0 14 0 17Standard Deviation 0.14 0.17
Coefficient of Variation 0.14 0.15
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EDC EVALUATION
Population “n” = 78,826 blows from 49 piles
STRESS, ENERGY, INTEGRITY AND BLOW COUNT
EDC/PDA
p 7 , 49 p
/
CSX CSB TSX EMX BTA Blow Count
Mean 0.92 0.80 1.33 1.00 1.01 0.98Mean 0.92 0.80 1.33 1.00 1.01 0.98
Median 0.92 0.83 1.30 0.96 0.98 1.00
Std. Deviation
0.09 0.20 0.39 0.19 0.03 0.17Deviation
Coefficient of
Variation
0.10 0.25 0.29 0.19 0.03 0.17
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EDC EVALUATION
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EDC EVALUATION
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EDC EVALUATION
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EDC EVALUATION
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EDC EVALUATION
SummaryyComparisons of total static capacity indicate that both UF and Fixed methods compare well with PDA with averages within 8
t d ffi i t f i ti d 0 20percent and coefficients of variation under 0.20 The discrepancies noted in predicted stress levels, particularly in maximum tension stress (TSX) and compressive stress at the ( ) pbottom of the pile (CSB), are being investigated.Comparisons made with CAPWAP predictions of total static
it d d l ithi 10 t ith COVcapacity produced mean values within 10 percent with COV under 0.25 for both methods.
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Questions??
Presentation available March 23 - April 30http://www.dot.state.fl.us/geotechnical/
In Memory of Millard Fuller 1935-2009:
Oyée