Construção de uma ferramenta numérica para análise de radiers estaqueados
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Data
2012-06-29
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Universidade Federal de Goiás
Resumo
A growing demand for better-prepared projects of foundations and able to attend the high
degree of structural complexity of the actions has been noted in recent years. However, the current geotechnical design philosophy shows itself outdated or unable to solve these needs,
due to the fact that traditional methods of calculating piled foundations often ignore the
performance of the block contact with the soil and neglect the influence of the stiffness and
the interaction among the elements that makeup the foundation system. To increase the
quality of the design of large pile groups, with or without associated columns, there is a need
for a more rigorous treatment of the problem and, in order to achieve it, one may employ the
concept of piled raft which allows an integrated analysis of the entire set responsible for the
performance of the foundation: the raft, the piles and the soil. This approach has a complexity
inherent of its formulation; therefore, its development is generally more successful employing
numerical methods. In this context, this study aimed to develop a three-dimensional numerical
tool in finite elements, using the programming language "C" for the study of piled raft
foundations, which was called Ferramenta Numérica para Análise de Fundações (FENF).
The program was fully developed during the research period and contrasts the commercial
software available at present for outputting the results that are necessary for the project, such
as stresses, strains, shear and normal efforts, displacements, and bending moments in the
block and the piles etc. In addition, along with the program, a search algorithm was developed
which is capable of identifying the best combination of the height and length of the block and
cross section of piles that result in a viable solution with the lowest cost. In order to do so, the
software employs the linear elastic constitutive model for materials and represents them
through finite three-dimensional isoparametric elements with eight nodes and linear
interpolation functions for the displacement fields. During its development and after it was
complete, the numerical tool has been successfully validated by comparing its results with
those of other programs also in finite element or with analytical solutions of the Linear
Theory of Elasticity. Two examples of application of FENF have been presented with
Exhaustive Search Ordered, in which: one block with 16 and another with 36 piles, allowing
us to evaluate the effectiveness of the program and compare its results with those predicted by
the simplified manual method. It’s been noticed that the integrated treatment of the foundation
system, considering it as a piled raft, allows us to obtain a more economical and safer project.
Descrição
Citação
BITTENCOURT, D. M. A. Construção de uma ferramenta numérica para análise de radiers estaqueados. 2012. 221 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2012.