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Abstract By conducting the centrifuge dynamic tests coverage to two kinds of piles with great stiffness difference，This paper investigated that there exist some quite different characteristics between behavior of flexible and stiff piles during earthquake shakings. For the flexible piles，the bending moment drops to a very small value below the changeover point. This is similar to the bending moment distribution curves for laterally loaded piles，and suggests that，for flexible piles，the clay beneath a certain depth is able to provide lateral support for the pile. On the other hand，for the stiff piles，the bending moment changes over at a much larger depth indicating that lateral support is not effective until much deeper. There is also much larger reverse moment below the changeover depth. This is quite different from the typical moment distribution of laterally loaded piles，the surrounding clay effect on the pile mainly focus on the providing additional inertia forces. Finally，a skillful parameter of pile-raft native frequency was presented herein to quantify pile flexibility.
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Received: 03 December 2010
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2011, Vol. 30 
