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You searched for subject:(Mechanics of continua). Showing records 1 – 2 of 2 total matches.

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Indian Institute of Science

1. Varghese, Renjitha Mary. Shaking Table Tests to Study the Influence of Ground Motion, Soil and Site Parameters on the Initiation of Liquefaction in Sands.

Degree: 2014, Indian Institute of Science

Liquefaction is a phenomenon in which soil loses a large percentage of its shear resistance due to increased pore water pressure and flows like a liquid. Undrained cyclic loading conditions during earthquakes cause liquefaction of soils, which can lead to catastrophic failures such as bearing capacity failures, slope failures and lateral spreads. The concepts and mechanisms of liquefaction were studied extensively by many researchers. Though the factors affecting the liquefaction response of soils during earthquakes are well documented in literature, there are still some gray areas in understanding the individual and combined effects of factors like frequency, gradation, fines content and surcharge pressure on the initiation of liquefaction. The objective of this thesis is to study the influence of ground motion, soil and site parameters on the initiation of liquefaction in saturated sand beds through laboratory shaking table model tests and numerical studies. Shaking table tests are carried out using a uniaxial shaking table on sand beds of 600 mm thickness. The initiation of liquefaction was observed and identified by measuring the pore water pressure developed during the sinusoidal cyclic loading. Free field liquefaction studies are carried out on sand beds to study the influence of ground motion parameters, namely, input acceleration and frequency of shaking on liquefaction. These studies revealed that acceleration is one of the important parameters that can affect the initiation of liquefaction in sands. Increase in acceleration reduces the liquefaction resistance of sand and a small increase in acceleration can trigger liquefaction. Frequency of shaking did not affect the initiation of liquefaction at lower frequencies but a threshold frequency which triggered instant increase in the excess pore pressures is observed. Liquefaction caused slight initial amplification followed by de-amplification of accelerations due to the stiffness reduction in soils during liquefaction, the effect being more pronounced in the top layers of the sand bed. Pore water pressure ratios during dynamic loading decreased with depth below the surface of the sand bed due to the low initial effective vertical stress and upward transmission of pore pressure during undrained loading. Shaking table tests are carried out to study the influence of soil parameters such as relative density, thickness of dry overlying sand layer and gradation. Relative density of sand can influence the liquefaction potential of sand to a great extent, about 10% increase in relative density bringing down the probability of liquefaction by about 50%. With the increase in height of dry overlying sand layer, liquefaction potential has decreased nonlinearly. Change in grain size altered the pattern of liquefaction and pore pressure development and it is observed that the liquefaction in finer sands is influenced by the frequency of shaking to a larger extent. Surcharge pressure from building loads increased the liquefaction potential and heavier structures got… Advisors/Committee Members: Madhavi Latha, G.

Subjects/Keywords: Soil Mechanics; Soil Liquefaction; Saturated Sand Beds; Sandy Soil Liquefaction; Shaking Table Tests; Fast Langrangian Analysis of Continua (FLAC); Sandy Soils; Soil Behavior; Sand Liquefaction; Liquefaction in Sand; Civil Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Varghese, R. M. (2014). Shaking Table Tests to Study the Influence of Ground Motion, Soil and Site Parameters on the Initiation of Liquefaction in Sands. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/3012

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Varghese, Renjitha Mary. “Shaking Table Tests to Study the Influence of Ground Motion, Soil and Site Parameters on the Initiation of Liquefaction in Sands.” 2014. Thesis, Indian Institute of Science. Accessed November 20, 2019. http://hdl.handle.net/2005/3012.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Varghese, Renjitha Mary. “Shaking Table Tests to Study the Influence of Ground Motion, Soil and Site Parameters on the Initiation of Liquefaction in Sands.” 2014. Web. 20 Nov 2019.

Vancouver:

Varghese RM. Shaking Table Tests to Study the Influence of Ground Motion, Soil and Site Parameters on the Initiation of Liquefaction in Sands. [Internet] [Thesis]. Indian Institute of Science; 2014. [cited 2019 Nov 20]. Available from: http://hdl.handle.net/2005/3012.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Varghese RM. Shaking Table Tests to Study the Influence of Ground Motion, Soil and Site Parameters on the Initiation of Liquefaction in Sands. [Thesis]. Indian Institute of Science; 2014. Available from: http://hdl.handle.net/2005/3012

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Universidade do Estado do Rio de Janeiro

2. Luciana Prado Mouta Pena. Análise de um método para equação de convecção formulado à luz da mecânica dos meios contínuos a advecção de anomalias oceânicas e meteorológicas.

Degree: PhD, 2006, Universidade do Estado do Rio de Janeiro

No presente trabalho estudamos e analisamos o método do Tubo de Trajetórias, um algoritmo conservativo, explícito, simples, fisicamente intuitivo, semi-Lagrangiano para equação de convecção. Mostramos que o método é incondicionalmente estável, essencialmente não-dispersivo, convergente e acurado de ordem 2 no tempo e no espaço. Soluções numéricas de sistemas e equações diferenciais ordinárias são testadas no contexto do método do Tubo de Trajetórias, com difíceis problemas clássicos. Aplicações são consideradas no âmbito do transporte oceânico e na advecção de frentes atmosféricas. A fim de testar as propriedades conservativas do método estudado, uma estimativa do erro de balanço de massa é usado aqui. Comparações com outras metodologias mostram a superioridade do método do Tubo de Trajetórias.

In the present work we studied and analyzed the Trajectories Tube method, a conservative, explicit, simple, physically intuitive, semi-Lagrangian algorithm for the convection equation. Kinematical aspects of the mechanics of continuous media are essentially the tools used for formulation and feasibility analysis. We showed that this method is unconditionally stable, essentially nondispersive, convergent and accurate of order two in time and space. Computational experiments with non-isochoric and isochoric motions show that the studied method can be used in compressible and incompressible flow. Numerical solutions of systems of ordinary differential equations (necessary conditions for acomplishment of the scheme) are tested in the Trajectories Tube method context, with classical difficult examples. Applications are considered in the ambit of oceanic transport and advection of atmospheric fronts, including the tracer problem within a Stommel gyre and the computation of the Dowell frontogenesis. Comparisions with other methodologies show the superiority of the Trajectories Tube method.

Advisors/Committee Members: Alexandre Santos Francisco, Luiz Nelio Henderson Guedes de Oliveira, Gustavo Mendes Platt, Clicia Valladares Peixoto Friedmann, Felipe Bastos de Freitas Rachid.

Subjects/Keywords: Mecânica dos meios contínuos; MATEMATICA APLICADA; Lagrange, Equações de; Equações diferenciais - Soluções numéricas; Frente (Meteorologia); Circulações oceânicas; Análise numérica; Algoritmo semi-lagrangiano; Equação de convecção; Método do tubo de trajetórias; Transporte oceânico; Mechanics of continua; Lagrange equations; Differential equations - Numerical solutions; Fronts (Meteorology); Ocean circulation; Numerical analysis; Semi-Lagrangian algorithm; Convection equation; Trajectories tube method; Oceanic transport

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Pena, L. P. M. (2006). Análise de um método para equação de convecção formulado à luz da mecânica dos meios contínuos a advecção de anomalias oceânicas e meteorológicas. (Doctoral Dissertation). Universidade do Estado do Rio de Janeiro. Retrieved from http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=872 ;

Chicago Manual of Style (16th Edition):

Pena, Luciana Prado Mouta. “Análise de um método para equação de convecção formulado à luz da mecânica dos meios contínuos a advecção de anomalias oceânicas e meteorológicas.” 2006. Doctoral Dissertation, Universidade do Estado do Rio de Janeiro. Accessed November 20, 2019. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=872 ;.

MLA Handbook (7th Edition):

Pena, Luciana Prado Mouta. “Análise de um método para equação de convecção formulado à luz da mecânica dos meios contínuos a advecção de anomalias oceânicas e meteorológicas.” 2006. Web. 20 Nov 2019.

Vancouver:

Pena LPM. Análise de um método para equação de convecção formulado à luz da mecânica dos meios contínuos a advecção de anomalias oceânicas e meteorológicas. [Internet] [Doctoral dissertation]. Universidade do Estado do Rio de Janeiro; 2006. [cited 2019 Nov 20]. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=872 ;.

Council of Science Editors:

Pena LPM. Análise de um método para equação de convecção formulado à luz da mecânica dos meios contínuos a advecção de anomalias oceânicas e meteorológicas. [Doctoral Dissertation]. Universidade do Estado do Rio de Janeiro; 2006. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=872 ;

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