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- W263669486 abstract "This work validates measured particle motions, and stresses measured internally (Embedded Data Collector, EDC) and externally at the top and bottom of prestressed concrete piles subject to dynamic hammer impacts. The first series of tests involved a horizontally supported pile in air subject to a 1000-lb hammer impact. Experimental results showed good correlation between internal vs. external gages, as well as good agreement with wave mechanics principles (e.g., reflection of compression wave with tension wave, etc.). The second series of tests involved an instrumented (internally and externally) 18-in x 18-in x 30-ft pile embedded 20 ft horizontally into a 15-ft x 20-ft x 45-ft sand embankment. The pile was struck at variable drop heights (1 ft to 6 ft) with a 1000-lb hammer and monitored. Again, the internal and external measured particle displacements, strains, and forces compared quite favorably between the external (e.g., PDA) and internal (EDC) gages at both the top and bottom of the pile. Subsequently, a one-dimensional wave equation was developed (inclusion of skin friction and damping) to model the experiments. The analytical solution of the equation revealed the potential of dispersion. Wavelet and spectral analysis of the top and bottom measured response revealed no dispersion, but a special case of theory, i.e., damping (c) and stiffness of T-Z curve being correlated (i.e., Smith damping). The work shows great promise in uniquely determining the side response (damping and static friction) separate from tip response (static tip and damping) using the top and bottom EDC gages." @default.
- W263669486 created "2016-06-24" @default.
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- W263669486 date "2009-06-01" @default.
- W263669486 modified "2023-09-22" @default.
- W263669486 title "Analyses of Embedded Data Collector (EDC)" @default.
- W263669486 hasPublicationYear "2009" @default.
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