| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 81 === The aim of the research is to study the interaction
relationships between soil and offshore pile under undrained
cyclic loads. Static P-Y curves are modified to reflect the
effects of cyclic lateral loads. The analytic method condiders
the increase of the initial pilelateral capacity due to higher
load rate, and then condiders the modulus and strength
degradation characterictics of soil around the pile under
cyclic loads to determine the modification of P-Y curve. The
computer program CYCLAT developed using the above algorithm was
used to study the cyclic test results of the Houston and Texas
full scale model piles. Predictions of the cyclic lateral
behavior of the foundation pile anchoring the Guo-Guang
production platform (CBK-11) were made. In addition, parametric
studies were conducted to understand the relative significance
of various relevant parameters on the cycliclateral pile
behavior. Analytical results show good agreement with pile test
data. The lateral capacity of offshore piles decrease as cyclic
lateral loading progresses. The decrease in capacity is usually
accomjpanied by an increase in lateral deflections at pile top.
In particular, when the pile is close to failure the pile top
deflections will increase rapidly. Resutls from the parametric
study show htat the most significant factors affecting the
undrained cyclic pile behavior are the magaitude of the loading
rate and the soil strength degradation. On the other hand, the
degradation of soil modulus have much less effect.
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