Metodologia híbrida aplicada em uma ferramenta numérica para análise de radier estaqueado

• Autor(a) principal: Carvalho, Sofia Leão
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/5274
• topic: Radier estaqueado; Análise numérica; Método dos elementos finitos; Ferramenta híbrida; Piled raft; Numerical analysis; Finite element method; Approximate computer methods; ENGENHARIA CIVIL::GEOTECNICA

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.