| Summary: | 碩士 === 淡江大學 === 土木工程研究所 === 83 === This paper computes the seismic bearing capacity factors of
shallow foundations. The method adopted in this study was based
on the Prandtl-Terzaghi''s failure mode and a perfect plastic
Coulomb material. Rankine''s method for calculation of passive
thrust was utilized in this study. The bearing capacity fctors
NcE, NqE, and NrE of shallow foundations as well as bearing
stress qult under seismic load were computated and tabulated.
Defining a reduction ratio, ec(q,r), as the bearing capacity
factors under seusmic load, Nc(q,r)E, and the same factors
without the seismic load, Nc(q,r)S ;then, after analyses, ec
and eq are very close to the same ratio extracting from the
literature, while the er is somewhat smaller. This indicates
the current method is conservative when compared with other
solotions.
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