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Project Number 187
Date of Summary September 30, 1997
Subject Analytical Simulation of Biased Loaded Tension Piles in Earthquakes
Performing Activity University of Houston
Principal Investigator Dr. Michael W. O'Neill
Contracting Agency Minerals Management Service
Estimated Completion Complete
Description This was a Joint Industry Project (JIP) and is an adjunct to Project No. 128. The study consisted of scaled laboratory tests of model piles loaded in biased tension during simulated earthquakes under two conditions that an earlier study suggested may be critical for the design of such piles. Piles used for foundations such as those for tension-leg platforms and pile-supported hydraulic structures. These conditions, were addressed in two separate tasks, including:

(1) the presence of `dirty` sandy soils with cohesion and cementation and

(2) the overpressures generated at the soil-water interface by the effects of the vertical component of earthquake motion.

The piles were tested in a pressure chamber and excited through soil at the base of the pressure chamber through a closed-loop, programmable testing machine. The behavior of the model piles under these conditions were analyzed using state-of-the-practice computer programs with a view toward developing a soil model that can be used in such programs by practitioners.

Progress Complete

Reports

AA (29 pages; 868 KB) File in Adobe's Portable Document Format (PDF) . O'Neill, M. W.,C. Vipulanandan, M. Ochoa, Response of Tension Piles to Simulated Seismic Motion in Saturated Fine Sand, 71st Annual Meeting, Transportation Research Board, Washington, D.C. January 12-16, 1992.
AB (69 pages; 1,657 KB) File in Adobe's Portable Document Format (PDF) . Model testing of the Effects of the Oceanside Event on Biased Loaded Tension Piles, Interim Report submitted by the University of Houston, Houston, TX, June 13, 1994.
AC (306 pages; 9,617 KB) File in Adobe's Portable Document Format (PDF) . Rao, Pramod M.,Cumaraswamy Vipulanandan, and Michael W. O'Neill, Performance of Tension Piles During Simulated Ground Shaking and Seaquakes, University of Houston, Department of Civil and Environmental Engineering, August 1997.

 

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