The load transfer
mechanism is summarized as follows:
When a socketed
foundation is loaded, the resistance is provided by both rock socket wall and
the socket base and the load distribution is a function of relative stiffness
of foundation concrete and rock
mass, socket geometry,
socket roughness and
strength.
At small displacements the
rock-socket system behaves
in an elastic
manner and the
load distribution between socket wall and socket end can be obtained
from elastic analysis.
At displacements
beyond 10-15 mm, relative
displacement occurs between
rock and foundation and
the socket bond
begins to fail.
This results in
reduction of loads
in rock-socket interface and
more loads are
transferred to the
socket end.
At
further displacements, the interface strength drops to a residual value
with total rupture of bond and more loads are then distributed to the socket
end.
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