This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D18 on Soil and. D Standard Test Method for High-Strain Dynamic Testing of Deep Foundations axial Standard + Redline PDF Bundle, 20, $, ADD TO CART . Dynamic Pile Testing. ASTM D Pile Driving Analyzer ®. Garland Likins, Pile Dynamics, Inc. PDCA Professor's Institute. Garland Likins, Pile Dynamics.
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DYNAMIC LOAD TEST Dynamic pile load test procedure is standardized by ASTM D Standard Test Method for high strain dynamic testing of piles. This standard is issued under the fixed designation D ; the 1 This test method is under the jurisdiction of ASTM Committee D18 on Soil. Both are covered by ASTM D • Pile Driving Monitoring consists of using a PDA to perform real time evaluation of Case Method capacity.
For a specific precautionary statement, see Note 4.
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Other Browser: Other 0. Direct Navigation IP: Not Logged In Member?: NO Cart: These signals were used to estimate static capacity using the Case Method, a simplified field procedure for estimating pile capacity, as well as the more rigorous CAPWAP.
The pile model consists of a series of continuous segments and the total resistance of the embedded portion of the pile is represented by a series of springs static resistance and dashpots dynamic resistance. Static resistance is formulated from an idealized elastoplastic soil model, where the quake parameter defines the displacement at which the soil changes from elastic to plastic behavior.
The dynamic resistance is formulated using a viscous damping model that is a function of a damping parameter and the velocity. First, the forces and accelerations acting on the actual pile during initial impact are recorded with a strain gauge and accelerometer mounted at the pile head.
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The measured acceleration is used as input to the pile model along with reasonable estimates of soil resistance, quake, and damping parameters. The force-time signal at the pile head is calculated using the model and is compared to the measured force-time signal.
The soil-resistance distribution, quake, and damping parameters are subsequently modified until agreement is reached between the measured and calculated signals. An example of a comparison between a measured and calculated force signal from one of the test piles is shown in figure Once an acceptable match is achieved, the solution yields an estimate of ultimate static capacity, the distribution of soil resistance along the pile, and the quake and damping parameters.
Figure Telltale rods installed at various depths within the piles were used to evaluate the load transfer behavior of the piles with regard to the surrounding soil and bearing stratum. The static tests were carried out in general accordance with project specifications section See references 37 through Static loads were applied and maintained using a hydraulic jack and were measured with a load cell.
A typical load test arrangement is shown in figure Reaction to the jack load is provided by a steel frame that is attached to an array of steel H-piles located at least 3 m away from the test pile.
Pile head deflections were measured relative to a fixed reference beam using dial gauges. Telltale measurements were made in reference to the pile head or the reference beam using dial gauges.
Pile head and telltale deflection data were recorded for each loading increment. Typical static load test arrangement showing instrumentation.
ASTM D4945-08 (High-Strain Dynamic Testing).pdf
Longer time increments may be used, but each time increment should be the same. At percent of the design load, unload to zero and hold for one-half hour; then reload to percent and continue 25 percent incremental loads.A permanent net penetration of as little as 2 mm per impact may indicate that sufficient movement has occurred during the impact event to fully mobilize the capacity.
Help Center Find new research papers in: Enter the email address you signed up with and we'll email you a reset link. This report presents our findings of the Site observations and explorations, Design and Construction of Three Instrumented Test Piles to Examine Time Dependent Pile sure movements along the pile during static load testing.
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The static plot is verified by modeling. The two test results are consistent to a good extent.
A series of hammer blows are made with the hammer drop height progressively increased and decreased . The quality of the result produced by this test method is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used.
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