| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.88 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
As microestacas são elementos de fundações profundas. Sua primeira
aparição data da década de 50. Foi concebida pelo engenheiro Fernando Lizzi,
com o nome de “Plai Radice” ou estaca raiz.
Apesar de originalmente sua concepção tenha sido para
recalçamentos de edifícios antigos, foi percebido o grande potencial que elas
tinham, pois, mesmo tendo diâmetros de até 300 mm, altos valores de
resistência podem ser atingidos.
Para o cálculo da resistência da microestaca, diversas formulações
podem ser adotadas, essas dependem de um extenso número de variáveis
para seu cálculo e cada teoria utiliza factores específicos.
Essa dissertação pretende entender e discutir a sensibilidade das
teorias utilizadas pelo software GEO5 para verificação da secção da
microestaca (Euler, Salas, Véas-Souche) e verificação da raiz da micrioestaca,
(Lizzi, Littlejonh e Bruce, Zweck, Véas-Souche, raiz em rocha e Bustamante
(PMT e SPT)).
Dessa maneira, foram realizadas 667 simulações utilizando o software
GEO5. Observando quais critérios o programa permite o usuário fazer
modificações, foram escolhidos cinco factores: diâmetro e comprimento da
microestaca, carga aplicada, Ângulo de atrito e coesão do solo.
Olhando de uma forma geral, conclui-se que os fatores do solo, Ângulo de
atrito e coesão, possivelmente, não afetam muito a capacidade resistente da
microestaca, pois na verificação da secção, foi visto que eles não influenciam, na
verificação da raiz, apenas duas teorias tiveram variação no resultado, as de
Bowles e Zewck, que variaram em média de 1% e 3%, respetivamente.
Os outros factores tiveram uma variação considerável, tanto na verificação
da secção como da raiz, com exceção do comprimento que não afetou os
resultados na verificação da secção.
Micropiles are elements of deep foundations. Their first appearance dates back to the 1950's. They were conceived by the engineer Fernando Lizzi under the name "Plai Radice" or root pile. Although originally their conception was for old building stabilization, it was noticed the great potential they had, because even having diameters of up to 300 mm, high resistance values can be reached. For the calculation of the micropiles resistance, several formulations can be adopted, these depend on an extensive number of variables for their calculation and each theory uses specific factors. This thesis aims to understand and discuss the sensitivity of the theories used by the GEO5 software to verify the micropiles section (Euler, Salas, Véas-Souche) and verification of the micropiles root, (Lizzi, Littlejonh and Bruce, Zweck, Véas-Souche, rock root and Bustamante (PMT and SPT)). Thus, 667 simulations were performed using the GEO5 software. Observing which criteria the program allows the user to make modifications, five factors were chosen: diameter and length of the micropiles, applied load, friction angle and soil cohesion. In general, it is concluded that the factors of the soil, angle of friction and cohesion, possibly, do not affect very much the resistant capacity of the micropiles, because in the verification of the section, it was seen that they do not influence, in the verification of the root, only two theories had variation in the result, those of Bowles and Zewck, which varied on average of 1% and 3%, respectively. The other factors had considerable variation in both the section and root verification, with the exception of the length which did not affect the results in the section verification.
Micropiles are elements of deep foundations. Their first appearance dates back to the 1950's. They were conceived by the engineer Fernando Lizzi under the name "Plai Radice" or root pile. Although originally their conception was for old building stabilization, it was noticed the great potential they had, because even having diameters of up to 300 mm, high resistance values can be reached. For the calculation of the micropiles resistance, several formulations can be adopted, these depend on an extensive number of variables for their calculation and each theory uses specific factors. This thesis aims to understand and discuss the sensitivity of the theories used by the GEO5 software to verify the micropiles section (Euler, Salas, Véas-Souche) and verification of the micropiles root, (Lizzi, Littlejonh and Bruce, Zweck, Véas-Souche, rock root and Bustamante (PMT and SPT)). Thus, 667 simulations were performed using the GEO5 software. Observing which criteria the program allows the user to make modifications, five factors were chosen: diameter and length of the micropiles, applied load, friction angle and soil cohesion. In general, it is concluded that the factors of the soil, angle of friction and cohesion, possibly, do not affect very much the resistant capacity of the micropiles, because in the verification of the section, it was seen that they do not influence, in the verification of the root, only two theories had variation in the result, those of Bowles and Zewck, which varied on average of 1% and 3%, respectively. The other factors had considerable variation in both the section and root verification, with the exception of the length which did not affect the results in the section verification.
Descrição
Mestrado de dupla diplomação com o Unichristus - Centro Universitário Christus
Palavras-chave
Análise computacional de microestacas Métodos semiempíricos Verificação da secção Verificação da raiz