REPORT ON HIGH-STRAIN DYNAMIC TESTING OF REINFORCED CONCRETE BORED PILE
|Pile ID: | | | | |
ICON ENGINEERING SERVICES
49/1A, Level-3, Purana Paltan Line, Dhaka-1000, Bangladesh
Tel: 933 67 64, 831 97 10. Fax: 933 67 64
2. PILE DRIVING DETAILS
3. TEST EQUIPMENT
4. PDA FIELD TESTING AND RESULTS
5. CAPWAP ANALYSIS
6. SUMMARY OF PDA INFORMATION
7. DISCUSSION OF RESULTS
|APPENDIX A : |CAPWAP ANALYSIS OF XX, BLOW#X | | | | | | | | | | | | |
Icon Engineering Services was engaged by the contractor to conduct high-strain dynamic test on RC bored pile for the construction of above project.
The aim of the test was to evaluate pile static capacity; and to measure settlement under the applied load. This report presents the results of dynamic pile testing and analysis using the Pile Driving Analyzer, PDA, in accordance with ASTM D4945-00.
2. PILE DETAILS
|Tested Pile ID |Pile Dimension (mm)|Pile Length (Below |Hammer |Date of Testing | | | |cutoff level) | | | | | | |Drop Hammer | |
3. TEST EQUIPMENT
A Pile Driving Analyzer TM and its associated pile top force and velocity transducers were used to conduct the dynamic pile test.
Two strain transducers and two accelerometers were attached to the pile head. They were mounted on opposite sides of the pile to cancel bending effects during each strike of the hammer. The signals of strain and acceleration were conditioned and processed by PDA.
The PDA is a micro-processor based signal conditioner and digital computer. Signals of pile top force and velocity for individual strike of the pile were measured and analyzed driving hammer and the results were stored in the Analyzer. The pile top force and velocity-time curves were displayed on laptop computer screen. Real time analogue signals of the pile top force and velocity were also recorded using the PDA and later stored in the field computer unit.
The PDA uses a program based on closed form Case-Goble solutions to compute static pile capacity from the pile top force and velocity data. This is subsequently checked with the computer program CAPWAP to confirm the static pile capacity obtained on site.
PDA FIELD TESTING AND RESULTS
Dynamic testing on the pile was conducted by striking the piles by several blows. During testing of the pile, complete dynamic measurements were obtained for each hammer blow delivered to the pile.
The PDA measures the total (static plus dynamic) resistance acting on the pile. The portion of total resistance that is computed as static resistance by the Analyzer is determined by the soil damping factor Jc set into the analyzer. Afterwards, on a more accurate independent...
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