1,721,058 research outputs found
Material Modeling Through Inverse Analysis
No full textSelfSim is also introduced to extract Red Blood Cells (RBCs) material stress-strain behavior from measurements of forces and displacements obtained by optical tweezers techniques. Deformation characteristics of RBCs are closely linked to disease (e.g. malaria) progression and hold promise as a tool for disease diagnosis. SelfSim reveals that in order to capture the interrelationship between measured axial and transverse deformations the stress-strain relationship for healthy RBC has to be anisotropic and thus differs from commonly assumed isotropic hyperelastic response. The deformability and anisotropic stress-strain behavior of healthy RBC decrease for mature stages of malaria.Made available in DSpace on 2015-09-25T21:04:39Z (GMT). No. of bitstreams: 2
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Previous issue date: 2009Embargo set by: Seth Robbins for item 84676
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only140 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009
Three-Dimensional Discrete Element Simulation of Granular Materials Using Polyhedral Particles
No full text214 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Microsoft Office.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Integration of Numerical Modeling and Field Observations of Deep Excavations
No full textThe final chapter of this thesis includes the application of SelfSim to extract the soil constitutive behavior directly from field measurements of two excavation case histories. SelfSim is able to extract sufficient information on soil behavior to capture measured excavation response in multilayer soil profiles. The analyses demonstrate that the proposed SelfSim framework enhances our prediction and model learning capabilities from observed performance and represents a new opportunity to incorporate numerical simulations as an integral component in the application of the observational method in geotechnical engineering.Made available in DSpace on 2015-09-25T21:03:59Z (GMT). No. of bitstreams: 2
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
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Previous issue date: 2005Embargo set by: Seth Robbins for item 84545
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only269 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005
Seismic Site Response and Extraction of Dynamic Soil Behavior From Downhole Array Measurements
No full text255 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.The presence of deep unconsolidated deposits in the upper Mississippi Embayment has an important impact on anticipated surface motions. PSHA-NL, probabilistic seismic hazard analysis with nonlinear site effects, can be used to estimate seismic hazard with the effect of deep deposits. This thesis extends the PSHA-NL procedure to incorporate a finite fault model in PSHA without applying artificial caps on computed ground motions, and include randomized soil column properties representing the Mississippi Embayment to evaluate depth dependent site coefficients. Probabilistic seismic hazard maps considering effects of thick soil deposit for Mississippi Embayment are proposed.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Integration of Numerical Modeling and Field Observations of Deep Excavations
No full text269 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005.The final chapter of this thesis includes the application of SelfSim to extract the soil constitutive behavior directly from field measurements of two excavation case histories. SelfSim is able to extract sufficient information on soil behavior to capture measured excavation response in multilayer soil profiles. The analyses demonstrate that the proposed SelfSim framework enhances our prediction and model learning capabilities from observed performance and represents a new opportunity to incorporate numerical simulations as an integral component in the application of the observational method in geotechnical engineering.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Interpretation of Soil Behavior From Laboratory Specimens Subjected to Non-Uniform Loading Conditions
No full text273 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Microsoft Office.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Visualization in Geomechanics With an Application to Deep Excavations
No full text331 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004.The second part of this dissertation explores the behavior of deep excavation numerical analyses, with the aid of the visualization techniques presented herein. First, a 2D plane strain excavation analysis is explored. Second, a 3D linear excavation is modeled using a variety of excavation techniques. Finally, a 3D excavation with a square footprint is modeled. Advanced visualization techniques are used to understand the complex 3D soil behavior that results. The visualization techniques present a vivid picture of the effect of excavation method selection on soil behavior and the development of a 3D arch for a square excavation.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Visualization in Geomechanics With an Application to Deep Excavations
No full textThe second part of this dissertation explores the behavior of deep excavation numerical analyses, with the aid of the visualization techniques presented herein. First, a 2D plane strain excavation analysis is explored. Second, a 3D linear excavation is modeled using a variety of excavation techniques. Finally, a 3D excavation with a square footprint is modeled. Advanced visualization techniques are used to understand the complex 3D soil behavior that results. The visualization techniques present a vivid picture of the effect of excavation method selection on soil behavior and the development of a 3D arch for a square excavation.Made available in DSpace on 2015-09-25T21:03:55Z (GMT). No. of bitstreams: 2
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
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Previous issue date: 2004Embargo set by: Seth Robbins for item 84537
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only331 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004
Numerical simulations of site response and seismic settlements at Kashiwazaki-Kariwa Nuclear Power Plant, Japan
Get PDFConstructed on the west coast of Japan, the Kashiwazaki-Kariwa Nuclear Power Plant was strongly shaken by Mw 6.6 Niigata-ken Chuetsu-oki earthquake in 2007. Significant seismic settlements were observed in dry sand deposits at both the free-field site and around the power plant structure components. These total and differential settlements were reported to be the main reasons for water and oil leakage, which eventually led to flooding and fire. This study focuses on three-dimensional, soil-porewater pressure coupled numerical modeling of multi-directional shear and volumetric response of Service Hall free-field site and Arahama Site on which the reactor and turbine buildings, as well as the transformer house are located using a newly developed soil-constitutive model in LS-DYNA. The Service Hall site consists of claystone overlain by loose sand whereas Arahama site has dense sand deposits on top of claystone. The comparison of measured and computed responses at the Service Hall vertical array site showed that the simulations captured the spectral responses. In addition, the simulation with multi-directional loading provided best estimates for seismic settlements and showed significant amount of settlements occurred in the dry sand deposits.
The free-field model was then extended to three-dimensional soil-structure interaction (SSI) model to investigate the seismic response of soil under and adjacent the Unit 1 reactor and Unit 3 turbine buildings at Arahama Site. The soil-structure interaction models successfully captured the measured response spectra at the base of Unit 1 reactor building and the surface response around Unit 3 turbine building, which was significantly greater than the surface response calculated from the simplified free-field simulations. Computed seismic settlements at the ground surface adjacent to the reactor, turbine building, and transformer house were consistent with field observations of ground subsidence, whereas the settlements of the structures themselves were negligible. These results demonstrate that the developed three-dimensional simulations of seismic soil-structure interaction provide reliable estimates of the potential effects of differential settlements which cannot be represented using free-field simplifications.Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2020-02-28 without embargo termsThe student, Alvin Bayudanto, accepted the attached license on 2019-12-03 at 15:22.The student, Alvin Bayudanto, submitted this Thesis for approval on 2019-12-03 at 15:38.This Thesis was approved for publication on 2019-12-04 at 15:07.DSpace SAF Submission Ingestion Package generated from Vireo submission #14673 on 2020-02-28 at 17:15:01Made available in DSpace on 2020-03-02T21:58:22Z (GMT). No. of bitstreams: 2
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Previous issue date: 2019-12-0
Numerical simulations of site response and seismic settlements at Kashiwazaki-Kariwa Nuclear Power Plant, Japan
No full textConstructed on the west coast of Japan, the Kashiwazaki-Kariwa Nuclear Power Plant was strongly shaken by Mw 6.6 Niigata-ken Chuetsu-oki earthquake in 2007. Significant seismic settlements were observed in dry sand deposits at both the free-field site and around the power plant structure components. These total and differential settlements were reported to be the main reasons for water and oil leakage, which eventually led to flooding and fire. This study focuses on three-dimensional, soil-porewater pressure coupled numerical modeling of multi-directional shear and volumetric response of Service Hall free-field site and Arahama Site on which the reactor and turbine buildings, as well as the transformer house are located using a newly developed soil-constitutive model in LS-DYNA. The Service Hall site consists of claystone overlain by loose sand whereas Arahama site has dense sand deposits on top of claystone. The comparison of measured and computed responses at the Service Hall vertical array site showed that the simulations captured the spectral responses. In addition, the simulation with multi-directional loading provided best estimates for seismic settlements and showed significant amount of settlements occurred in the dry sand deposits.
The free-field model was then extended to three-dimensional soil-structure interaction (SSI) model to investigate the seismic response of soil under and adjacent the Unit 1 reactor and Unit 3 turbine buildings at Arahama Site. The soil-structure interaction models successfully captured the measured response spectra at the base of Unit 1 reactor building and the surface response around Unit 3 turbine building, which was significantly greater than the surface response calculated from the simplified free-field simulations. Computed seismic settlements at the ground surface adjacent to the reactor, turbine building, and transformer house were consistent with field observations of ground subsidence, whereas the settlements of the structures themselves were negligible. These results demonstrate that the developed three-dimensional simulations of seismic soil-structure interaction provide reliable estimates of the potential effects of differential settlements which cannot be represented using free-field simplifications
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