Unformatted text preview: face Foundation subjected to a
Dynamic Vertical Load During a vertical
excitation Peiωt, a
vertical contact earthpressure σ(xj)eiωt is
caused along the
contact area(x1<xj<x2)
between the foundation
bottom and the soil
surface. Contact EarthPressure Consider a
displacement u(xi) at a
point xi due to a earthpressure σ(xj) at a
point xj.
Green’s Function When σ(xj)=1, a displacement u(xi) at a point xi is called
“Green’s Function”, and expressed by:
u(xi ) = g(xi : xj ) (1) The displacement at xi due to whole contact earth pressure σ(xj) , x1<xj<x2 is given by:
u(xi) = g(xi : xj)σ(xj) dxj (2) Partition the
interface between
foundation and s...
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 Summer '14
 DrGRD
 Surface Foundation, Dynamic Impedance Function

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