Metodologia híbrida aplicada em uma ferramenta numérica para análise de radier estaqueado
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2015-09-30
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Universidade Federal de Goiás
Resumo
The combination of two different types of foundation has become increasingly popular among
engineers in the past few decades as a good alternative for large loads due to the trending
expansion of taller skyscrapers. This new concept in foundation engineering, called piled raft,
combines the raft capacity of withstanding large loads to the reduced settlement provided by a
group of piles strategically placed. This new concept of foundation design has stimulated the
use of new methodologies that look for understanding the interaction between its elements (raft,
piles and soil), the settlement and the distribution of load between them. Over the past decades,
the development of faster and more powerful computers has allowed engineers to use numerical
methods in the analysis of this type of problem assisted by new software tools. Among all
possible numerical methods, the Finite Element Method (FEM) has stood up for being precise
and very adaptable to many situations. Despite its extensive applicability, the FEM method has
its limitations regarding the processing time and capacity of computers mainly when the third
dimension of the foundation is considered. For the fore mentioned reason, hybrid tools have
been developed combining FEM to other methods aiming faster analysis and better quality
results. In this context, this thesis presents a new tool, called Soil-Foundation Interaction
Analysis, SoFIA. The code was developed in object-oriented programming with Approximate
Computer Methods. The raft in SoFIA is modelled as two-dimensional finite plate elements,
and the group soil/piles ins modelled as an elastic base. Each stage of the tool development and
a set of application models are described on this report based on literature review. This work
aimed creating a self-sufficient tool capable of analyzing a piled raft model with all the
interaction analysis. Furthermore, the program SoFIA was modelled using object-oriented
programming, anticipating future expansions, such as different finite elements, non-linear
response and other types of foundation. Example results showed good agreement when
compared to literature regarding settlement, share of load between raft and piles and moments
in x and y directions. Moreover, the axisymmetric interaction analysis between elements of
piles and soil indicated similar settlement when compared to complete tridimensional analysis
and Boundary Element Method.
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Citação
CARVALHO, S. L. Metodologia híbrida aplicada em uma ferramenta numérica para análise de radier estaqueado. 2015.142 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil ) - Universidade Federal de Goiás, Goiânia, 2015.