| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 84 === With the rapid development of economics, many major traffic
projects are proposed in Taiwan. However, it''s not easy to get
land to carry out these projects these times, therefor, they
are often constructed by high-rise way, and the pile
foundations are the most used in this way. In general, pile
foundations are often made of cast-in-place concrete and
gathered in pile groups , thus, the behaviors of such kind
foundations due to lateral loads become an important study. In
this study, we use Focht- koch (model to analize pile groups
and take P-factor ( suggested by Reese-Wang(1989) )and Y-factor(
apply Mindlin Equation (1936)) into account. According to this
structure of analysis, we edit a computer program "GROUP" to
analize these behaviors and hope to understand further the
"Group Effects" due to these behaviors. Also in this study, we
use API p-y curves in single pile, and modify them due to the
in-situ cast-in-place pile load tests. After that, we apply
modified API p-y curves in the analysis of pile groups. Because
of none of lateral cast-in- place pile groups tests in usual
soils, we take examples of such cases of Taipei and then find
the factors affecting them. Accor- ding to the analysis of
examples, the modified model of this study can improve the
disadvantage of Focht-Koch method and the analized results of
distribution of shears of pile heads are also reasonable.
Besides, from the analysis of factors, pile spacing is the most
important factor affecting the behaviors of lateral loaded pile
groups. With the pile spacing decreasing, group effects become
more and more remarkable, the rigidity of pile groups lows
down, the most largest moment of each pile increases and the
ranges of the distribution of shears of pile heads also
increase.
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