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A micromechanical study of energy di...

Denissen, Christina.

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A micromechanical study of energy dissipation mechanisms in granular soils subjected to cyclic loading.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	A micromechanical study of energy dissipation mechanisms in granular soils subjected to cyclic loading./
Author:	Denissen, Christina.
Description:	137 p.
Notes:	Source: Masters Abstracts International, Volume: 48-02, page: 1184.
Contained By:	Masters Abstracts International48-02.
Subject:	Engineering, Geological. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1470290
ISBN:	9781109488395

A micromechanical study of energy dissipation mechanisms in granular soils subjected to cyclic loading.
Denissen, Christina.

A micromechanical study of energy dissipation mechanisms in granular soils subjected to cyclic loading. - 137 p.

Source: Masters Abstracts International, Volume: 48-02, page: 1184.

Thesis (M.S.)--Southern Methodist University, 2009.

Liquefaction of granular soils has been at the source of many structural failures during major earthquakes, and for this reason has been an extensively researched topic in the geotechnical engineering field. Numerous studies have used energy-based methods to define the liquefaction potential of a soil. Among these studies are those that apply the energy concept, which suggests that there is a specific amount of dissipated energy after which liquefaction will take place in a saturated granular soil. This study utilizes the discrete element method (DEM) to present a microscopic energy monitoring approach to characterize energy dissipation mechanisms in cyclically loaded soils.

ISBN: 9781109488395Subjects--Topical Terms:

1035566
Engineering, Geological.

A micromechanical study of energy dissipation mechanisms in granular soils subjected to cyclic loading.
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020 $a 9781109488395
035 $a (UMI)AAI1470290
035 $a AAI1470290
040 $a UMI $c UMI
100 1 $a Denissen, Christina. $3 1674987
245 1 2 $a A micromechanical study of energy dissipation mechanisms in granular soils subjected to cyclic loading.
300 $a 137 p.
500 $a Source: Masters Abstracts International, Volume: 48-02, page: 1184.
500 $a Adviser: Usama El Shamy.
502 $a Thesis (M.S.)--Southern Methodist University, 2009.
520 $a Liquefaction of granular soils has been at the source of many structural failures during major earthquakes, and for this reason has been an extensively researched topic in the geotechnical engineering field. Numerous studies have used energy-based methods to define the liquefaction potential of a soil. Among these studies are those that apply the energy concept, which suggests that there is a specific amount of dissipated energy after which liquefaction will take place in a saturated granular soil. This study utilizes the discrete element method (DEM) to present a microscopic energy monitoring approach to characterize energy dissipation mechanisms in cyclically loaded soils.
520 $a Computational simulations of consolidated undrained (CU) cyclic triaxial tests are conducted using synthetic soil samples packed at various relative densities. The samples are subjected to strain-controlled cyclic sinusoidal and irregular random loading patterns of different frequencies and maximum shear strain amplitudes. The onset of liquefaction is illustrated through time histories of pore-water pressure and coordination number. The time histories of individual microscale energy components are then presented. A comparison is made between the dissipated energy calculated from microscopic energy components monitored in the simulations and macroscopic energy calculated based on the area of shear stress-shear strain loops. A number of simulations that resulted in liquefaction are discussed, and the energy concept for evaluating liquefaction potential is examined based on these results. The material damping ratio and specific damping capacity at both the microscale and macroscale are also presented.
520 $a Numerical simulations are also conducted on saturated deposits of granular particles subjected to seismic excitations, modeled using a transient fully-coupled continuum-fluid discrete-particle model. The macroscopic and microscopic response patterns are presented, followed by an in-depth look at the individual microscale energy components both before and after the onset of liquefaction. The impact of general seismic loading on liquefaction potential including the effects of excitation amplitude and frequency content, loading pattern (sinusoidal/random), and direction of the dynamic load (one-directional/twodirectional) is explored. The energy concept for evaluation of liquefaction potential is again examined based on the results of these simulations.
520 $a Results from the conducted simulations indicate that there may not be a specific amount of energy after which liquefaction will take place in a soil, especially for denser soil deposits. A sample with a specific packing density may dissipate different quantities of energy prior to liquefaction, depending on the amplitude of the applied shear strain and the nature of the dynamic load.
590 $a School code: 0210.
650 4 $a Engineering, Geological. $3 1035566
650 4 $a Engineering, Civil. $3 783781
690 $a 0466
690 $a 0543
710 2 $a Southern Methodist University. $b Environmental and Civil Engineering. $3 1026810
773 0 $t Masters Abstracts International $g 48-02.
790 1 0 $a El Shamy, Usama, $e advisor
790 1 0 $a Hurmuzlu, Yildirim $e committee member
790 1 0 $a Mohraz, Bijan $e committee member
790 $a 0210
791 $a M.S.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1470290