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VERTICAL VIBRATION OF FLOATING PILES
BY
MILOS NOVAK
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Research
THE FACULTY OF ENGINEERING SCIENCE
THE UNIVERSITY OF WESTERN ONTARIO
LONDON; ONTARIO
CANADA
N6A 589
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Vertical Vibration of Floating Piles
by f
Milos Novak1,M.ASCE
Introduction
Vertical vibration of piles has to be considered when de
signing footings or structures for dynamic vertical loads or
for horizontal loads which produce rotation of the pile cap.
Such loads are most often generated by wind, earthquake and
the operation of machines.
When the pile vibrates, its stiffness is modified and
damping is generated through interaction of the pile with the
surrounding soil. These phenomena are very complex and little
understood. As a result of this piles are sometimes quite
ignored and their reactions are replaced by those of an elas
tic half-space. Conversely, in other approaches to piles the
soil is more or less ignored.
Vertical response of piles has received even less atten
tion than horizontal response, which has been studied by
Penzien (7) and a few others. Two theories were published
recently concerning vertical excitation (3,4). Both of them
assumed a fixed tip (end bearing piles). Experiments have
shown, however, that the vertical response can be much more
affected by the motion of the tip than the horizontal response
lprofessor,Faculty of Engineering Science, The University of Western Ontario, London, Ontario, Canada N6A 5B9.
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