Observations of Insitu Soil Behavior and Soil-Foundation-Structure Interaction at the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Permanently Instrumented Field Sites

Abstract eng:
The NEES@UCSB equipment site, focused on making field observations of ground motions, ground deformations, pore pressure response, and soil-foundation-structure interaction, has now been in operation for over three years. While the expected M6+ target event in the region of the NEES@UCSB permanent sites has not yet occurred, numerous earthquakes have been recorded which highlight the ability of the observation systems to record pore pressure increases associated with earthquakes in the magnitude 4-5 range. These observations, in the 10%g acceleration range, demonstrate the level of ground motion where onset of pore pressure increase and non-linear soil behavior starts. In addition to the interesting pore pressure and acceleration records from within the soil column, an instrumented experimental structure located at one of the NEES field sites has also recorded many of these same events and its response is analyzed. This structure is also excited regularly using a permanently mounted shaker located under the roof. Observations using this shaker provide insight into the affect of environmental conditions on structural response.

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