NEHRP Clearinghouse
- Title
- Full-Scale Pile Vibration Tests.
- File
- PB82192378.pdf
- Author(s)
- Tsai, C. F.; Scott, R.; Steussy, D.
- Source
- National Science Foundation, Washington, DC., December 1981, 125 p.
- Abstract
- A test program designed to study the potential phenomenon of liquefaction in soil adjacent to pile lead and to monitor the dynamic response characteristics of the pile-soil system during vibration is summarized. A full-scale, instrumented steel pipe pile was driven into saturated silty sand and subjected to dynamic lateral loads by use of two vibration generators. Pile bending moments, displacements, and accelerations, as well as pore pressures and ground velocities in the surrounding soil, were measured. The vibratory loads were of the magnitude of actual force expected during earthquake loading. Partial liquefaction and subsidence developed around the head of the pile during vibration near the first mode resonance frequency. The liquefaction resulted in a loss of soil resistance in the critical upper layers of soil surrounding the pile. Field tests and analytical studies are summarized and results are presented in terms of pile resonance frequencies, model shapes, damping, bending moments, forces, and displacements.
- Keywords
- Dynamic loads; Pile soil interactions; Field tests; Pile structures; Forced vibration; Earthquake engineering; Resonant frequency; Liquefaction (Soils); Pile foundations; Soil properties; Sands; Earthquakes