ASTM D4945 PDF
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.
The Engineer should determine how the size and shape of the pile, and the properties of the soil or rock beneath and adjacent to the pile, affect the amount of movement required to fully mobilize the static capacity.
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.
However, high displacement driven piles may require greater movement to avoid under predicting the static capacity, and cast-in-place piles often require a larger cumulative permanent net penetration for a series of test blows to fully mobilize the capacity.
Static capacity may also decrease or increase over time after the pile installation, and both static and dynamic tests represent the capacity at the time of the respective test.
Correlations between measured ultimate axial static compression capacity and dynamic test estimates generally improve when using dynamic restrike tests that account for soil strength changes with time see 6. Additional transducers embedded near the pile toe may also help improve tension capacity estimates.
If the Engineer does not have adequate previous experience for the specific site and pile type with the analysis of dynamic test data for tension capacity, then a static load test carried out according to Test Method D should be used to verify tension capacity estimates. Test Method D provides a direct and more reliable measurement of static tension capacity. Users of this test method are cautioned that compliance with Practice D does not in itself assure reliable results.
Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Scope 1. Plans, specifications, or provisions or combinations thereof prepared by a qualified engineer may provide additional requirements and procedures as needed to satisfy the objectives of a particular test program.
The cap must be cylindrical, smooth, well-reinforced and of good quality concrete. The side of the cap is instrumented with two strain gauges, two accelerometers and electronic theodolite target. The electronic theodolite is placed 3 to 5m from the pile head. A schematic sketch of SIMBAT equipment and instrumentation is presented in Figure 2 , whereas a photograph of a complete set of the equipment is shown in Figure 3.
A series of hammer blows are made with the hammer drop height progressively increased and decreased . Q The main difference between this system and other dynamic load test systems is the using of an electronic scanning theodolite that records penetration for each blow and records real time elastic displacement . The measured force at the pile top is separated into components upward and downward.
The dynamic or total reaction, Rdy is calculated for each hammer blow and plotted versus cumulative penetration for the whole set of blows.
The dynamic load is converted to static load and the predicted static load-settlement curve can be plotted. The static plot is verified by modeling. Svinkin analyzed a distinctive case history presented by Briaud et al. All tests were carried out on bored concrete piles. Three projects are residential tower buildings representing a part of the residential tower buildings complex of Red Sea state.
This is Portsudan city, which is located in western coast of the Red Sea in eastern Sudan .
The formation at this area is predominantly coralline deposits consisting of completely to slightly weathered coral reef limestone that contains marine shells and fossils.
This formation is characterized with great variability in horizontal and vertical directions.
Q Tower 7 Load kN D. L Load KN 0 0 0.
Q D. In our opinion, it is wise that to determine the actual pile ultimate capacity for a project by testing at least one pile to failure.
This will enable an economical pile design and offer a considerable saving of cost for the project. The comparisons of load-settlement behaviors for dynamic and static load tests, shown in Figure 5 , Figure 6 and Figure 7 , indicate that the predicted settlement from dynamic and the measured settlement from static are generally consistent to a reasonable extent as reflected by the results of towers 7 and 8.
But generally the settlements predicted by dynamic load test are slightly higher than the settlement measured by the static load test.
This is very clear especially in the results of the pile of tower 1 project. This paper has been focused on this type of pile loading test.
Four case studies of dynamic and static pile loading tests conducted in the eastern of Sudan have been presented. The load-settlement behaviors for dynamic and static load tests were compared for the three case studies of the residential tower buildings complex project. This shows a reasonable agreement between the two test results.The load-settlement behaviors for dynamic and static load tests were compared for the three case studies of the residential tower buildings complex project.
Dynamic pile monitoring takes advantage of the fact that, for driven piles, it is possible to compute the energy delivered to the pile, compression stresses at the pile top and toe and tension stresses along the shaft. An example of a comparison between a measured and calculated force signal from one of the test piles is shown in figure Full Description 1.
Dynamic load testing
The electronic theodolite is placed 3 to 5m from the pile head. This paper has been focused on this type of pile loading test. The origins of these testing methods date to research conducted in the s and s at what is now known as Case Western Reserve University , with funding of the Ohio Department of Transportation. These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard.
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.
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