EFFECT STUDY OF PILE STIFFNESS ON PILE-SOIL DYNAMIC INTERACTION PROBLEM
MA Kang1，PEI Jianliang2
(1. School of Architecture and Civil Engineering，Xiamen University，Xiamen，Fujian 361005，China；2. School of Water
Resources and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China)
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.
BANERJEE S，GOH S H，LEE F H. Response of soft clay strata and clay-pile-raft systems to seismic shaking[J]. Journal of Earthquake and Tsunami，2007，1(3)：233-255.
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2011, Vol. 30 
