Made available in DSpace on 2014-12-17T14:48:12Z (GMT). No. of bitstreams: 1
JohnGBG_DISSERT.pdf: 5632038 bytes, checksum: eabbd6743af14f648742650469c3d48f (MD5)
Previous issue date: 2012-07-02 / A numerical study on the behavior of tied-back retaining walls in sand, using
the finite element method (FEM) is presented. The analyses were performed using
the software Plaxis 2D, and were focused on the development of horizontal
displacements, horizontal stresses, shear forces and bending moments in the
structure during the construction process. Emphasis was placed on the evaluation of
wall embedment, tie-back horizontal spacing, wall thickness, and free anchor length
on wall behavior. A representative soil profile of a specific region at the City of Natal,
Brazil, was used in the numerical analyses. New facilities built on this region often
include retaining structures of the same type studied herein. Soil behavior was
modeled using the Mohr-Coulomb constitutive model, whereas the structural
elements were modeled using the linear elastic model. Shear strength parameters of
the soil layers were obtained from direct shear test results conducted with samples
collected at the studied site. Deformation parameters were obtained from empirical
correlations from SPT test results carried out on the studied site. The results of the
numerical analyses revealed that the effect of wall embedment on the investigated
parameters is virtually negligible. Conversely, the tie-back horizontal spacing plays
an important role on the investigated parameters. The results also demonstrated that
the wall thickness significantly affects the wall horizontal displacements, and the
shear forces and bending moments within the retaining structure. However, wall
thickness was not found to influence horizontal stresses in the structure / O presente trabalho apresenta um estudo num?rico atrav?s do m?todo dos elementos
finitos (MEF) utilizando-se o aplicativo computacional Plaxis 2D, com o objetivo de verificar
aspectos do comportamento de estruturas de conten??o atirantadas em areia. As an?lises
foram dirigidas ao desenvolvimento dos deslocamentos horizontais, das tens?es horizontais
e dos esfor?os internos (esfor?o cortante e momento fletor) durante o processo construtivo
da estrutura. As simula??es num?ricas inclu?ram avalia??es da influ?ncia do comprimento
da ficha, do espa?amento horizontal entre os tirantes, da espessura da parede e do
comprimento do trecho livre. O perfil de solo utilizado nas simula??es num?ricas ?
representativo de uma determinada regi?o da Cidade de Natal RN, na qual s?o
constru?das com frequ?ncia conten??es do tipo analisado no presente trabalho. Utilizou-se o
modelo constitutivo de Mohr-Coulomb para simular o comportamento do solo e o modelo
el?stico linear para simular o comportamento dos elementos estruturais. Os par?metros de
resist?ncia do solo foram determinados por meio de ensaios de cisalhamento direto e os
par?metros de deformabilidade foram estimados atrav?s de correla??es emp?ricas obtidas
de resultados de ensaios SPT executados na regi?o em estudo. Os resultados obtidos
mostraram que varia??es no comprimento da ficha praticamente n?o influenciam o
comportamento da estrutura, no ?mbito dos par?metros avaliados, ao passo que o
espa?amento horizontal entre os tirantes apresenta forte influ?ncia sobre essas grandezas.
Verificou-se tamb?m que a espessura da parede apresenta consider?vel influ?ncia sobre os
deslocamentos horizontais e sobre os esfor?os internos e pouca influ?ncia sobre as tens?es
horizontais
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/14838 |
| Date | 02 July 2012 |
| Creators | Gurgel, John Glennedy Bezerra |
| Contributors | CPF:92610927487, http://lattes.cnpq.br/6737841388506901, Santos J?nior, Olavo Francisco dos, CPF:35816384449, http://lattes.cnpq.br/1573496204231636, Albuquerque, Paulo Jos? Rocha de, CPF:75313006720, http://lattes.cnpq.br/0419076401765262, Soares, Wilson Cartaxo, CPF:02424565457, http://lattes.cnpq.br/3832097394733852, Costa, Yuri Daniel Jatob? |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Civil, UFRN, BR, MEC?NICA DAS ESTRUTURAS, ESTRUTURAS DE CONCRETO E ALVENARIA E MATERIAIS E PROCESSOS CONSTRUTIVOS |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.0029 seconds