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Doctoral Thesis
DOI
https://doi.org/10.11606/T.18.2006.tde-19072006-093551
Document
Author
Full name
Rodrigo Gustavo Delalibera
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2006
Supervisor
Committee
Giongo, Jose Samuel (President)
Albiero, Jose Henrique
Carvalho, Roberto Chust
Correa, Marcio Roberto Silva
Franca, Ricardo Leopoldo e Silva
Title in Portuguese
Análise numérica e experimental de blocos de concreto armado sobre duas estacas submetidos à ação de força centrada e excêntrica
Keywords in Portuguese
análise experimental
análise numérica
bielas e tirantes
blocos sobre estacas
fundações
Abstract in Portuguese
A pesquisa teve como objetivo analisar e discutir o comportamento de blocos de concreto armado sobre duas estacas submetidos à ação de força centrada e excêntrica. Desenvolveu-se uma análise numérica tridimensional não-linear de blocos de concreto armado sobre duas estacas. A análise numérica levou em consideração a fissuração do concreto e a influência das armaduras no comportamento estrutural dos blocos. Por meio da análise numérica, foi possível perceber o comportamento e a forma geométrica das bielas de compressão, com isso, obteve-se melhor entendimento do modelo de bielas (escoras) e tirantes aplicado a blocos de concreto armado sobre duas estacas. A geometria observada nos modelos numéricos analisados preliminarmente difere da usualmente sugerida por vários autores. Realizou-se investigação experimental de blocos, com o fim principal de observar, de modo mais abrangente, a geometria das bielas de compressão. A instrumentação foi posicionada nas faces dos blocos com extensômetros espaçados de modo a ocuparem boa parte da largura e, conseqüentemente, indicarem as suas geometrias. A análise experimental de blocos sobre duas estacas submetidos à ação de força excêntrica permitiu observar o comportamento das bielas e tirantes que diferem dos observados quando a força é centrada. Também foi analisada a eficiência dos ganchos das barras de aço que compõem os tirantes, verificando-se que os ganchos podem ser omitidos sem prejuízo da segurança estrutural dos blocos. Em função dos resultados obtidos por meio das análises experimental e numérica desenvolveram-se modelos de bielas e tirantes aplicados a blocos sobre duas estacas
Title in English
Numerical and experimental analysis of two pile caps submitted to the action of a load centered and eccentric
Keywords in English
experimental analysis
fundations
pile caps
strut-and-tie
Abstract in English
The research had as objective to analyze and to argue about the behavior of two pile caps submitted to the action of a centered and eccentric load. A nonlinear three-dimensional numerical analysis of two pile caps was developed. The numerical analysis included the cracking and the influence of the reinforcement in the structural behavior of the pile caps. By the numerical analysis, it was possible to perceive the behavior and the geometric form of the strut, with this understand the model strut-and-tie applied to the two pile caps. The geometry observed in the numerical models analyzed at first differs from the usually suggested by some authors. This project realized experimental tests of piles caps to observe the geometry of the struts. The instrumentation was located in the faces of the pile caps with spaced strain-gages in order to occupy good part of the width and, consequently, indicate its geometry. The experimental analysis of two pile caps submitted to the eccentric load allowed the behavior observation of the strut and tie that differ from the one observed when the load was centered. Also the efficiency of the hooks of the reinforced bar was analyzed, therefore, in the experimental analysis of pile caps already developed, it was verified that the hooks can be omitted without damage of the structural security of the pile caps. For treating the procedure defined in the project, and taking advantage of the experimental analysis realized, it was understood that this requirement can be analyzed and that the results will bring benefits to the project. In function of the results obtained through the experimental and numeric analysis strut-and-tie models were developed to be applied in two pile caps
 
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Publishing Date
2006-08-04
 
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