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by G. Norris, R. Siddharthan, Z. Zafir, S. Abdel-Ghaffar and P. Gowda
Norris, G., R. Siddharthan, Z. Zafir, S. Abdel-Ghaffar and P. Gowda (1991). Soil-Foundation-Structure Behavior at the Oakland Outer Harbor Wharf. SMIP91
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 11-1 - 11-11.
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Abstract
This paper discusses the use of CSMIP records at Oakland Outer Harbor Wharf (along with that
from Yerba Buena) to study the free-field motions at Oakland Outer Harbor, both at shallow
depth and to bedrock, and the possible softening of soils surrounding the piles supporting
the instrumented wharf. The paper also discusses the determination of the motion on the
instrumented wharf using free-field motion input and deflection compatible lateral and vertical
pile foundation stiffnesses. Such derived motion compares well with the recorded motions on the
deck. While there was no reported liquefaction at the site, there was at nearby locations; and
the consequence of an assumed lower relative density of the near-surface sand at Oakland Outer
Harbor is discussed. Likewise, the consequence of a change in the orientation of the wharf or
the incoming motions, assessed by interchanging the direction of the free-field motions, is
presented. These latter changes reflect conditions under which a soil-foundation interaction
failure or structural failure of the batter piles may have developed, failures that occurred
at facilities nearby.
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