Index Catalog // GW ScholarSpace

Analysis of frontal airbag non-deployment related fatalities and severe injuries

Description:: Recently, Kansas City Star published an article stating that about 1,400 occupants had died in the last six years in frontal crashes in which airbags did not deploy. The FARS data investigation shows an increasing trend of fatal crashes involving airbag non-deployment with higher fatality risk in...
Author:: Raj, Prithvi
Keyword:: Non-deployment, Crashes, Frontal Airbags, Fatalities, Injury, and Deployment
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Diggess, Kennerly
Committee Member(s):: Eskandarain, Azim, Kan, Cing-Duo, Hamdar, Samer, and Silva, Pedro
Resource Type:: Thesis or Dissertation

Development and Validation of Progressive Deformable Barrier Modeled with Shell Elements

Description:: Deformable crash test barriers used for vehicle crash tests are made of deformable aluminum honeycomb blocks. These aluminum honeycomb blocks have excellent energy absorbing capabilities. They have different crush strengths representing the front end of a vehicle. The finite element models of...
Author:: Nagaraj, Pavan
Keyword:: Shell Elements, Progressive Deformable Barrier, and Negative Volume
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Marzougui, Dhafer
Committee Member(s):: Eskandarian, Azim, Kan, Cing-Dao (Steve), Manzari, Majid T, and Silva, Pedro F
Resource Type:: Thesis or Dissertation

Development and validation of new algorithms to improve contact detection and robustness in finite element simulations

Description:: Approximately half of all numerical problems in crashworthiness analysis involve impact dynamics, and accurate contact algorithms are critical to capture the structures’ behavior. Conventional contact algorithms use the principle of preventing ‘ slave ’ nodes from penetrating ‘master’ segments....
Author:: Mahadevaiah, Umashankar
Keyword:: Contact mechanics, contact detection, Finite element analysis, contact search, contact algorithm, and FEM
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Eskandarian, Azim and Marzougui, Dhafer
Committee Member(s):: Opiela, Kenneth, Kan, Cing-Dao, Manzari, Majid T, and Badie, Sameh S
Resource Type:: Thesis or Dissertation

Development of a Novel Steering Control Collision Avoidance System

Description:: In this research development of a steering collision avoidance system was investigated. First, different control approaches to perform an evasive collision avoidance maneuver using active steering was presented. Both linear and nonlinear controllers to control the combined lateral and...
Author:: Soudbakhsh, Damoon
Keyword:: Collision avoidance, Linear controller, Optimization, Sliding Mode Controller, Neighboring Optimal Control, and Collocation
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Eskandarian, Azim and Roddis, Kim
Committee Member(s):: Eskandarian, Azim, Manzari, Majid, Hamdar, Samer, Roddis, Kim, and Bared, Joe
Resource Type:: Thesis or Dissertation

Multiple Grid Multiple Time-Scale (MGMT) Simulations in Linear Structural Dynamics

Description:: The work presented in this dissertation describes a general algorithm and its Finite Element (FE) implementation for performing concurrent multiple sub-domain simulations in linear structural dynamics. Using this approach one can solve problems in which the domain under analysis can be...
Author:: Ruparel, Tejas
Keyword:: Finite Element Analysis, Multiple Sub-domain Analysis, Multiscale Simulations, Domain Decomposition Methods, Structural Dynamics, and Lagrange Multipliers
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Eskandarian, Azim and Lee, James
Committee Member(s):: Li, Tianshu, Manzari, Majid, and Lee, Kunik
Resource Type:: Thesis or Dissertation

An Efficient Mesh-Free Particle Method for Modeling of Free Surface and Multiphase Flows

Description:: Numerical methods have been used extensively in modeling of free surface flows. These methods are generally classified into two categories; grid methods, and particles methods. In recent years, particle methods are gaining further attentions among numerical model developers for simulation of free...
Author:: Nabian, Mohammad Amin
Keyword:: Mesh-Free Particle Methods, Multiphase Flow, Computational Efficiency, Free Surface Flow, MPS Method, and Landslide
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Farhadi, Leila
Committee Member(s):: Riffat, Rumana, Manzari, Majid T., Haque, Muhammad I., and Farhadi, Leila
Resource Type:: Thesis or Dissertation

Finite Element Modeling of Pretensioned Concrete Girders: A Methodological Approach with Applications in Large Strands and End Zone Cracking

Description:: Two issues pertaining to the current state of pretensioning industry are investigated in this research: spacing of 0.7-in. diameter strands and effectiveness of end zone reinforcing details. Given the current economic constraints and the limitation of testing facilities, there is a great need for...
Author:: Arab, Amir A.
Keyword:: End Zone Cracking, Transfer Length, 0.7-in. Diameter Strands, Pretensioned Concrete, Finite Element, and Elastoplastic
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Manzari, Majid T and Badie, Sameh S
Committee Member(s):: Roddis, Kim, Silva, Pedro F, and Dekelbab, Waseem
Resource Type:: Thesis or Dissertation

Measuring the Impact of Motivations on Travelers’ Strategic Decisions in Different Traffic Conditions: Data Collection, Analysis and Modeling

Description:: AbstractMeasuring the Impact of Motivations on Travelers’ Strategic Decisions in Different Traffic Conditions: Data Collection, Analysis and ModelingContinued growth in travel demand and the corresponding congestion occurrence accentuate the need of Active Transportation and Demand Management...
Author:: PAN, DONG
Keyword:: inertia, virtual environment, mode choices, motivations, survey, and the theory of planned behavior
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Silva, Pedro
Committee Member(s):: Hamder, Samer and Angoshtari, Arzhang
Resource Type:: Thesis or Dissertation

The development of a generalized meshfree approximation for solid and fracture analysis

Description:: This dissertation is concerned with the development of a generalized meshfree (GMF) approximation to improve the accuracy and efficiency of conventional meshfree methods in the solid and fracture analysis. The particular focus of the dissertation is placed on both the mathematical and numerical...
Author:: Park, Chung-Kyu
Keyword:: cohesive fracture mechanics, convex approximation, Kronecker-delta property, meshfree method, non-convex approximation, and basis function
GW Unit:: Civil & Environmental Engineering
Degree:: D.Sc.
Advisor:: Kan, Cing-Dao and Wu, Cheng-Tang
Committee Member(s):: Eskandarian, Azim, Manzari, Majid T, and Hamdar, Samer H
Resource Type:: Thesis or Dissertation

Reliability analysis of slender RC bridge columns under the combined effects of gravity and lateral loads

Description:: The latest philosophy adopted by the American Association of State Highway and Transportation Officials (AASHTO), and Federal Highway Administration (FHWA) is the Load and Resistance Factor Design (LRFD) method. This philosophy accounts for the inherent uncertainties both in demand and capacity...
Author:: Heydarpour, Parsa
Keyword:: P-Delta effects, Nonlinear time history analysis, Reliability analysis, and RC bridge columns
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Silva, Pedro F
Committee Member(s):: Critchfield, Milton, Manzari, Majid, Roddis, Kim, and Badie, Sameh
Resource Type:: Thesis or Dissertation

Combined Forward Osmosis and Membrane Distillation System for Wastewater Treatment and Reuse

Description:: Sustainable solutions for clean, affordable water are becoming increasingly important due to water scarcity problem in different parts of the world. Membrane processes can present an effective approach to address this issue. Recently developed membrane technologies such as forward osmosis (FO)...
Author:: Husnain, Taqsim
Keyword:: Forward Osmosis, Sidestream Treatment, Rejection, Membrane Distillation, and Organic Fouling
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Riffat, Rumana and Mi, Baoxia
Committee Member(s):: Manzari, Majid, Hamdar, Samer, and Shuai, Danmeng
Resource Type:: Thesis or Dissertation

"Current Topics on Bridge Engineering"

Description:: Nowadays, engineers are challenged to provide economic solutions that could be implemented within minimum schedules. Also, higher security levels are in need.One of the most time consuming tasks in a bridge project is the construction of the superstructure. Precast full-depth concrete deck panels...
Author:: Mesia, Walter Damian
Keyword:: PCI multipliers, Impact Loads, Full depth precast panels, Bridges, Stress strain effects, and NonLinear
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Badie, Sameh S
Committee Member(s):: Manzari, Majid T, Silva, Pedro F, Mi, Baoxia, and Dekelbab, Waseem
Resource Type:: Thesis or Dissertation

Feasibility of Anaerobic Digestion at 45C

Description:: Anaerobic digestion at mesophilic and thermophilic temperatures have been widely studied and evaluated by numerous researchers. Limited research has been conducted on anaerobic digestion in the intermediate zone of 45°C, mainly due to the notion that limited microbial activity occurs within this...
Author:: Mohd, Nuruol Syuhadaa
Keyword:: Anaerobic Digestion, thermophilic, TPAD, kinetics, inhibition, and 45C
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Riffat, Rumana
Committee Member(s):: Manzari, Majid, Pedro, Silva, Subramaniam, Vel, and Shuai, Danmeng
Resource Type:: Thesis or Dissertation

New tools for smoke residue and deposition analysis

Description:: The physics of smoke deposition from a hot layer to a wall has been studied in a hood apparatus. The hood apparatus was specifically designed to study the smoke deposition based on thermophoresis experimentally and analytically in this work. For the first time the optical density method was used...
Author:: Riahi, Siamak
Keyword:: Gray scale, Fire, Analysis, Deposition, Thermophoresis, and Smoke
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Roddis, W.M. Kim and Beyler, Craig
Committee Member(s):: Riffat, Rumana, Keidar, Michael, Roddis, Kim, Sunderland, Peter, Beyler, Craig, and Silva, Pedro
Resource Type:: Thesis or Dissertation

An Investigation into the Behavior of Ottawa Sand through Monotonic and Cyclic Shear Tests

Description:: The current state of practice for predicting the liquefaction potential of soils relies on Standard Penetrometer Test (SPT) or Cone Penetration Test (CPT) results that are converted into a measure of liquefaction resistance through the use of design charts and empirical formulas. This empirically...
Author:: Vasko, Andrew Conrad
Keyword:: Cyclic Triaxial, liquefaction, Triaxial Test, and Ottawa Sand
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Manzari, Majid T
Committee Member(s):: Yonten, Karma and Silva, Pedro
Resource Type:: Thesis or Dissertation

Bridging the Gap between Social and Transportation Networks: An Integrated, Dynamic Evacuation Decision Making Model

Description:: Human behavior during an emergency evacuation is complex and difficult to predict accurately. The complexity of human behavior in these situations lies in the social interactions that have been shown to have a significant impact on decision making. Furthermore, when a hazardous situation arises...
Author:: Schorr, Justin Philip
Keyword:: Disaster Management and Relief, Intelligent Systems Design, Genetic Algorithm Calibration, Social Network Modeling, Hurricane Evacuation, and Discrete Choice Modeling
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Hamdar, Samer H
Committee Member(s):: Easkandarian, Azim, van Dorp, Rene, Murray-Tuite, Pamela, and Manzari, Majid
Resource Type:: Thesis or Dissertation

Development of A Generalized Isotropic Yield Surface for Pressure Insensitive Metal Plasticity Considering Yield Strength Differential Effect in Tension, Compression and Shear Stress States

Description:: AbstractDevelopment of A Generalized Isotropic Yield Surface for Pressure Insensitive Metal Plasticity Considering Yield Strength Differential Effect in Tension, Compression and Shear Stress StatesDue to effects of twinning and texture evolution, the yield surface for hexagonal close packed (HCP)...
Author:: Sengoz, Kivanc
Keyword:: strain rate dependency, computational metal plasticity, constitutive behaviour of Al2024-T351 and Ti-6Al-4V, thermal softening, explicit finite element analysis, and yield strength differential
GW Unit:: Civil & Environmental Engineering
Degree:: D.Engr.
Advisor:: Eskandarian, Azim and Kan, Cing-Dao (Steve)
Committee Member(s):: Omar, Tarek, Manzari, Majid T, and Silva, Pedro F
Resource Type:: Thesis or Dissertation

CHARACTERIZING DENITRIFICATION KINETICS AND STOICHIOMETRY AT DIFFERENT TEMPERATURES USING VARIOUS CARBON SOURCES

Description:: Facilities across North America are designing plants to meet stringent limit of technology (LOT) treatment for nitrogen removal (3 mg/L total effluent nitrogen). The Blue Plains Advanced Wastewater Treatment Plant (AWTP) is one of many facilities in the Chesapeake Bay regions evaluating its...
Author:: Mokhayeri, Yalda
Keyword:
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Riffat, Rumana and Murthy, Sudhir
Committee Member(s):: Manzari, Majid, Roddis, Kim, Mi, Baoxia, and Badie, Sameh
Resource Type:: Thesis or Dissertation

Reliability Analysis of Statically Determinate and Indeterminate Beams Designed with Moment Redistribution

Description:: Reliability based analysis is a well-established tool in probability-based structural design. The load equation from the ACI Code along with several others ACI design methods are analyzed in order to verify that the reliability index using limit state functions are consistent across both...
Author:: Singh, Raminder
Keyword:
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Silva, Pedro F. and Manzari, Majid T.
Committee Member(s):: Li, Tianshu
Resource Type:: Thesis or Dissertation

Multiple Frontal Impacts: Prevention, Prediction and Protection

Description:: Multiple Frontal Impacts: Prevention, Prediction and ProtectionAs the sophistication and effectiveness of safety devices have increased over the years, safety engineers have begun to look beyond the crash itself. While work has continued on traditional devices such as airbags and seatbelts,...
Author:: Kildare, Shaun
Keyword:: multiple impacts, accident investigation, NASS, transportation safety, accident reconstruction, and CDS
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Eskandarian, Azim and Digges, Kennerly H
Committee Member(s):: Hollowell, William T, Silva, Pedro F, and Hamdar, Samer H
Resource Type:: Thesis or Dissertation

Graphical User Interface and Teaching Aid for Moment Curvature Analysis

Description:: Moment Curvature Analysis Program (MCAP) has been developed for establishing moment-curvature analyses using an interface between a MATLAB® Graphical User Interface (GUI) and the finite element program Open System for Earthquake Engineering Simulation (OpenSees). The MATLAB® GUI was developed...
Author:: Warren, John E.
Keyword:: Teaching Aid, Curvature, Moment, and Reinforced Concrete
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Silva, Pedro F.
Committee Member(s):: Li, Tianshu and Badie, Sameh S.
Resource Type:: Thesis or Dissertation

Investigation Of Microbial Yield Kinetics For Denitrifying Microorganisms Using Ethanol As An External Carbon Source

Description:: The purpose of this study was to investigate the feasibility of ethanol as an alternate substrate for biological denitrification by measuring various growth kinetic parameters. The growth yield coefficient is measured for endogenous nitrate removal while external carbon substrate is still...
Author:: Rahman, Arifur
Keyword:: Denitrification, SDNR, Growth Yield, Anoxic, Carbon to Nitrogen ratio, and Ethanol
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Riffat, Rumana and Murthy, Sudhir N
Committee Member(s):: Manzari, Majid T and Hamder, Samer
Resource Type:: Thesis or Dissertation

A METHOD TO ASSESS DYNAMIC RESPONSES IN A CRASH SIMULATION

Description:: This dissertation addresses the development of a new approach to assess the inter-relationship among dynamic responses, and their sensitivities and robustness in crash simulation applications. Given inherent uncertainties in the laboratory data and appropriate input parameters of the model, this...
Author:: HONG, SEONG WOO
Keyword:: Impact, Validation, Stochastic, Simulation, Uncertainty, and Crash
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Kan, Cing-Dao (Steve)
Committee Member(s):: Eskandarian, Azim, Manzari, Majid T, Silva, Pedro F, and Opiela, Kenneth S
Resource Type:: Thesis or Dissertation

An Integrated Approach to Identify Thoracic Injuries in Rollover Crashes

Description:: The objective of this work is to evaluate thoracic injuries for restrained occupants in far-side rollover and to propose a dynamic rollover test device. Most rollover studies have been driven by litigation and mainly focused on head and spinal injuries, while thoracic injuries, which correspond...
Author:: Tahan, Fadi
Keyword:: Thoracic Injuries, LS-DYNA, Rollover, Chest Injuries, Simulation, and Guided Rollover Test
GW Unit:: Civil & Environmental Engineering
Degree:: D.Sc.
Advisor:: Eskandarian, Azim and Digges, Kennerly
Committee Member(s):: Hollowell, William T., Manzari, Majid, and Hamdar, Samer
Resource Type:: Thesis or Dissertation

High-Rate Activated Sludge Systems: A Promising Technology to Harvest Organic Carbon from Municipal Wastewater

Description:: The high-rate activated sludge (HRAS) systems are shifting the energy intensive processes to low-energy and sustainable technologies for wastewater treatment. In order to recover energy-rich organic carbon from wastewater, the HRAS system is a key technology for moving towards energy neutral (or...
Author:: Rahman, Arifur
Keyword:: Settleability, Carbon harvesting, Contact-Stabilization, Biosorption, Extracellular polymeric substance, and A-stage
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Riffat, Rumana and De Clippeleir, Haydee
Committee Member(s):: Riffat, Rumana, De Clippeleir, Haydee, Farhadi, Leila, Jimenez, Jose, and Shuai, Danmeng
Resource Type:: Thesis or Dissertation

A Critical State Two-Surface Plasticity Model for Simulation of Flow Liquefaction and Cyclic Mobility

Description:: AbstractA Critical State Two-Surface Plasticity ModelforSimulation of Flow Liquefaction and Cyclic MobilityA major part of damage to buildings and port infrastructure during seismic events is due to soil-structure interaction during ground shaking. When saturated granular soils are subjected to...
Author:: Rahimi Abkenar, Morteza
Keyword:: Flow Liquefaction, Constitutive Modeling, Geotechnical Engineering, Elasto-Plasticity, Cyclic Mobility, and Earthquake
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Manzari, Majid T
Committee Member(s):: Silva, Pedro F., Critchfield, Milton O., Roddis, W. M. Kim, and Yonten, Karma
Resource Type:: Thesis or Dissertation

A Steady-State Visual Evoked Potential Brain-Computer Interface System Evaluation as an In-Vehicle Warning Device

Description:: This thesis is part of current research at Center for Intelligence Systems Research (CISR) at The George Washington University for developing new in-vehicle warning systems via Brain-Computer Interfaces (BCIs). The purpose of conducting this research is to contribute to the current gap between...
Author:: Riyahi, Pouria
Keyword:: Adaptive Filtering, SSVEP Brain Signals, Car-Simulator Experiments, Drivers' Behaviors, Multivariate Data Analysis, and Reaction Time and Distances
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Eskandarian, Azim
Committee Member(s):: Hamdar, Samer and Haque, Muhammad I.
Resource Type:: Thesis or Dissertation

Fatigue Analysis of Steel Bridge Details: Hot Spot Stress Approach

Description:: This research successfully applies the hot spot stress approach to steel highway bridges for fatigue evaluation of welded details subject to in-plane stress or out-of-plane distortion. The existing nominal stress approach addresses distortion only qualitatively and is unable to deal with novel...
Author:: Bhargava, Ashish
Keyword:: Distortion Induced Fatigue, Steel Bridge, Fatigue Analysis, Fiber Brag Grating, FEM, and Hot Spot Stress
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Roddis, W. M. Kim
Committee Member(s):: Badie, Sameh S., Manzari, Majid T., Fisher, John W., and Seaver, Mark
Resource Type:: Thesis or Dissertation

Evaluation and Novel Application of 45ºC Anaerobic Digestion

Description:: This study was aimed to evaluate the performance of anaerobic digestion system at 45°C condition. Both mesophilic 35°C and thermophilic 55°C temperature anaerobic digestion have been widely studied. However, very limited research has been conducted on 45°C anaerobic digestion. It is due to the...
Author:: Li, Baoqiang
Keyword:: Anaerobic Digestion, Temperature Phase Anaerobic Digestion, Volatile Fatty Acids, Methanogens, Class A biosolids, and Sewage Sludge
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Riffat, Rumana
Committee Member(s):: Riffat, Rumana, Manzari, Majid T., and Shuai, Danmeng
Resource Type:: Thesis or Dissertation

Protection of Rear Seat Occupants in Frontal Crashes, Assessment Methodology and Injury Metrics

Description:: Historically, rear seat positions have been considered safer than front seat positions, especially during frontal crashes. However, recent crash test results, with dummies included in their rear seats, have shown high injury measures for those dummies, exceeding the injury limits proposed by...
Author:: Sahraei Esfahani, Elham
Keyword:: Effectiveness, Frontal crash, Occupant protection, Rear seat occupant, and Stiffness of vehicle
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Digges, Kennery and Marzougui, Dhafer
Committee Member(s):: Eskandarian, Azim, Hamdar, Samer, Roddis, Kim, and Eigen, Anna Maria
Resource Type:: Thesis or Dissertation

Full Depth Precast Deck Panel Systems Supported by a System of Discrete Haunches

Description:: Full-depth precast panel systems are one of the categories of accelerated bridge construction. This type of construction has many advantages in comparison with other methods of construction. Per AASHTO LRFD Specifications, the spacing of shear connectors is limited to 4 ft for concrete girders,...
Author:: Zamani, Arzhang
Keyword:
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Badie, Sameh S.
Committee Member(s):: Badie, Sameh S., Silva, Pedro F., Manzari, Majid T., Roddis, Kim, and Arab, Amir A.
Resource Type:: Thesis or Dissertation

DEVELOPMENT OF A PROCESS FOR HARMFUL ALGAL BLOOM LOCATION PREDICTION USING GIS AND TREND ANALYSIS FOR THE TERRESTRIAL WATERS OF KUWAIT

Description:: The State of Kuwait is situated at the northwestern end of the Persian Gulf and has a population of 2.5 million people, the vast majority of whom live along the southeastern stretch of its 500 km coastline. Kuwait Bay, a shallow natural harbor situated at the eastern "mouth" of the country, lies...
Author:: Shuhaibar, Bassam Nabeel
Keyword:: Red tide, N, P Ratio, Holt-Winters' Additive, Kuwait Bay, Harmful algal bloom, and GIS
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Riffat, Rumana
Committee Member(s):: Tallent, Robert, Manzari, Majid T, Roddis, Kim, and Choudhury, Sayedul H
Resource Type:: Thesis or Dissertation

Meshfree vs. Mesh-based Numerical Methods in Hydro-Mechanically Coupled Analysis of Soils

Description:: Soil is a multiphase material composed of solid particles, liquid and gas. In case of fully saturated soils, the deformation and stress analysis of soils subjected to external loading requires simultaneous satisfaction of balance of linear momentum, constitutive behavior of soil skeleton, and...
Author:: El Ghoraiby, Mohamed Ahmed
Keyword:: Numerical Methods, Soil Mechanics, Hydro-Mechanical, Coupled, Finite Element Method, and Meshfree
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Manzari, Majid T.
Committee Member(s):: Eskandarian, Azim and Silva, Pedro F.
Resource Type:: Thesis or Dissertation

Analysis of Reinforced/Prestressed Concrete Members Using Advanced Techniques

Description:: Analysis of bonded reinforced and prestressed concrete members for flexure should be conducted using the strain compatibility approach as stipulated by the ACI-318 design code published by the American Concrete Institute and the AASHTO LRFD Specifications published by the American Association of...
Author:: Pipp, Gabrielle
Keyword:: reinforced/prestressed concrete, prestress loss, interaction diagram, power formula, flexure, and strain compatibility
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Badie, Sameh S
Committee Member(s):: Manzari, Majid T and Roddis, Kim
Resource Type:: Thesis or Dissertation

Work Zone Characteristics in Microscopic Acceleration Modeling: Calibration and Numerical Analysis

Description:: The essential need to maintain roadway structures, makes encountering work zones an inevitable part of today's driving. Presence of work zones can impact the traffic flow characteristics in the macroscopic and the microscopic levels. The corresponding changes in traffic dynamics directly affect...
Author:: Zehtabi, Sanaz
Keyword:
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Hamdar, Samer H
Committee Member(s):: Eskandarian, Azim, Hamdar, Samer H, and Haque, Muhammad I
Resource Type:: Thesis or Dissertation

Weather and Road Geometry in Microscopic Acceleration Modeling: Calibration and Numerical Analysis

Description:: AbstractThe increase in road traffic volumes leads to significant environmental and economic problems. It also gives rise to the growing demand for better traffic management strategies. Transportation researchers tried for decades to investigate the dynamics of traffic flow in order to optimize...
Author:: Qin, Lingqiao
Keyword:: Cognitive Factors, Decision-Making, External Factors, Prospect Theory, and Longitudinal Driving Behavior
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Hamdar, Samer Hani
Committee Member(s):: Eskandarian, Azim and Kan, Cing-Dao (Steve)
Resource Type:: Thesis or Dissertation

SENSITIVITY ANALYSIS OF NHTSA'S SIDE SLED DESIGN FOR EVALUATING CRS PERFORMANCE IN SIDE IMPACTS.

Description:: Side impact crashes are second most fatal type of crashes in United States (U.S), accounting for 300 children lives every year. The use of Child Restraint Systems (CRS) for restraining the occupants in child seats has been effective in reducing injuries to children involved in crashes. Currently...
Author:: Sangade, Vishal Devidas
Keyword:: CRS
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Marzougui, Dhafer
Committee Member(s):: Eskandarian, Azim, Badie, Sameh, Marzougui, Dhafer, and Haque, Muhammad
Resource Type:: Thesis or Dissertation

Traffic Operation and Control during Evacuation Conditions: An Integrated Management System with Multi-level Coordination

Description:: During the past decade, large storms, mudflows, hurricanes, floods, and many other extreme conditions have caused massive economic and human losses in cities and regions around the world. In the United States, Hurricane Katrina and the September 11th, Terrorists Attacks are relevant examples of...
Author:: Khan, Muhammad Zeeshan
Keyword:
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Hamdar, Samer H
Committee Member(s):: Eskandarian, Azim, Kan, Cing-Dao, and Haque, Muhammad
Resource Type:: Thesis or Dissertation

Denitrification Kinetics and Stoichiometry of a Moving Bed Biofilm Reactor Using Methanol as an External Carbon Source

Description:: The primary objective of this research was to better understand the denitrification kinetics and to determine kinetic and stoichiometric parameters for nitrogen removal of a MBBR( Moving Bed biofilm Reactor) system. Mainly, four parameters: specific denitrification rate (SDNR), half saturation...
Author:: Shrestha, Arbina
Keyword:: Half saturation constant, Biomass density, denitrification, Wastewater, Chesapeake Bay, and Moving Bed Biofilm
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Riffat, Rumana
Committee Member(s):: Murthy, Sudhir, Manjari, Majid, and Mi, Bioxia
Resource Type:: Thesis or Dissertation

Structural Optimization of a Surrogate Test Vehicle using Honeycomb Material

Description:: Roadside hardware devices play an important role in vehicle safety, they redirect vehicles, reduce their speed and absorb impact energy. All roadside hardware devices have to undergo extensive testing procedures in order to validate and guarantee their performance. In order to reduce costs and to...
Author:: Panzer, Florian
Keyword:: Surrogate Vehicle, Roadside Hardware Testing, Honeycomb, Optimization, Response Surface Methodology, and Method of Finite Elements
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Eskandarian, Azim
Committee Member(s):: Hamdar, Samer H and Silva, Pedro
Resource Type:: Thesis or Dissertation

Bench Scale Evaluation of two Enhanced Digestion Processes: Enhanced Enzymic Hydrolysis and Acid-Gas Phased Digestion

Description:: The overall objective of this research was to make a comparative evaluation of two enhanced digestion processes for digestion of thickened municipal sludge from Blue Plains Advanced Wastewater Treatment plant. The digestion processes studied were Enhanced Enzymic Hydrolysis (Process I) and...
Author:: AHMED, FARID
Keyword:
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Riffat, Rumana
Committee Member(s):: Riffat, Rumana, Murthy, Sudhir, Roddis, Kim, and Mi, Baoxia
Resource Type:: Thesis or Dissertation

Vehicle Dynamics Modeling and Simulation Approach for Safety Performance Evaluation of Cable Barriers in Curves

Description:: Cable barriers are an alternative safety countermeasure to rigid or semi-rigid barriers (Guardrails, Concrete Barriers, etc.) for run-off-road crashes on highways with moderate to light traffic flow. Due to their low installation cost and reduced impact severity, the State DOTs have installed...
Author:: Bonnevie, Simon
Keyword:: Safety of cable barriers, Horizontal curvature, Vehicle dynamics, Transportation Safety, Roadside hardware, and Cable median barriers
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Eskandarian, Azim
Committee Member(s):: Manzari, Majid T., Hamdar, Samer, Kan, Cing-Dao Steve, and Marzougui, Dhafer
Resource Type:: Thesis or Dissertation

Development of A Tabulated Thermo-Viscoplastic Material Model with Regularized Failure for Dynamic Ductile Failure Prediction of Structures under Impact Loading

Description:: It is important to understand the dynamic failure behavior of structures subjected to impact loading in order to improve the survivability. Materials under impact are utterly affected by large deformations, high strain-rates, temperature softening and varying stress-states, which finally may lead...
Author:: Buyuk, Murat
Keyword:: Impact, Applied mechanics, Ductile failure, Material model, Ballistic impact, and Plasticity
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Eskandarian, Azim and Kan, Cing-Dao (Steve)
Committee Member(s):: Queitzsch, Gilbert K., Du Bois, Paul A., Silva, Pedro F., Marzougui, Dhafer, and Hamdar, Samer H.
Resource Type:: Thesis or Dissertation

Implementation and Validation of an Anisotropic Plasticity Model for Clay and a Two-Scale Micropolar Constitutive Model for Sand

Description:: As a multi-phase material, soil exhibits highly nonlinear, anisotropic, and inelastic behavior. While it may be impractical for one constitutive model to address all features of the soil behavior, one can identify the essential aspects of the soil's stress-strain-strength response for a...
Author:: Yonten, Karma
Keyword:: shear banding, anisotropic clay, localization, micropolar plasticity, post-failure response, and granular soil
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Manzari, Majid T and Roddis, Kim
Committee Member(s):: Eskandarian, Azim, Bannout, Samir M, and Silva, Pedro F
Resource Type:: Thesis or Dissertation

Determination of Denitrification Kinetics for Methanol Utilizing Bacteria

Description:: To meet new stringent effluent nitrogen limits, wastewater treatment facilities need accurate kinetic parameters to effectively achieve design objectives. Denitrification process optimization depends on treated effluent limits, but most importantly on the capabilities of an efficient system. Blue...
Author:: Torres Ortiz, Viviana
Keyword:: denitrification kinetics, half saturation coefficient, Ks, methylotrophs, and methanol
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Riffat, Rumana and Murthy, Sudhir N.
Committee Member(s):: Manzari, Majid and Hamdar, Samer
Resource Type:: Thesis or Dissertation

Real World Derived Simulation Methodology for the Evaluation of Fleet Crash Protection of New Vehicle Designs

Description:: At the present time, the crash safety of new and concept vehicle designs, i.e., with advanced materials or structure or powertrains, is primarily assessed through computer simulations of single-vehicle crash test protocols specified by existing regulations and consumer information programs....
Author:: Samaha, Randa Radwan
Keyword:: occupant crash modeling, system modeling, vehicle crash modeling, frontal crash protection, fleet safety, and injury risk
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Eskandarian, Azim
Committee Member(s):: Hollowell, William T, Hamdar, Samer H, Digges, Kennerly H, and Haque, Muhammad I
Resource Type:: Thesis or Dissertation

Development and Validation of Finite Element Models and Analysis of Critical Parameters of High-Tension Cable Barrier Systems

Description:: This project focuses on the development, validation, and sensitivity analysis of finite element models of high-tension cable barrier systems. The literature review details the available cable barrier systems, performance reviews of high-tension systems, and the previous development of a...
Author:: Galli, Richard Michael
Keyword:: Cable Barriers, FEA, and Finite Element Analysis
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Eskandarian, Azim and Marzogui, Dhafer
Committee Member(s):: Manzari, Majid T. and Roddis, Kim
Resource Type:: Thesis or Dissertation

Evaluation of Options to Extend Span Range of Precast Prestressed Concrete Bridge Girders During Preliminary Design

Description:: Abstract of DissertationEvaluation Of Options To Extend Span Range Of Precast Prestressed Concrete Bridge Girders During Preliminary DesignDesign of highway bridges passes through the following two phases: 1- Preliminary design where the design engineer decides on the major artifact type and...
Author:: Ferhadi, Abdulrazaq Sadiq
Keyword:: Girders, Extending Span Range, Precast, Prestressed, Bridge, and Concrete
GW Unit:: Civil & Environmental Engineering
Degree:: Ph.D.
Advisor:: Badie, Sameh S.
Committee Member(s):: Roddis, W.M. Kim, Manzari, Majid T., Bannout, Samir M., and Hamdar, Samer H.
Resource Type:: Thesis or Dissertation

Investigation of Denitrification Kinetics at Warm Temperature using Respirometer

Description:: The Chesapeake Bay Agreement has forced many utilities in the watershed to research new and improved methods to reduce nitrogen concentrations in the bay. To achieve this goal, District of Columbia Water and Sewer Authority (DCWASA) is voluntarily exploring technologies that can help reduce its...
Author:: Salam, Nazia
Keyword:: Respirometer, Denitrification Kinetics, Half Saturation Coefficient, and SDNR
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Riffat, Rumana
Committee Member(s):: Murthy, Sudhir, Roddis, Kim, and Mi, Baoxia
Resource Type:: Thesis or Dissertation

P-Delta Limit State in the Design of Slender RC Bridge Columns

Description:: The main objective of this research program is to evaluate the seismic response of slender reinforced concrete (RC) bridge columns to second order P-Delta effects. This research has led to the development of a new methodology for explicitly addressing P-Delta effects in the seismic design of...
Author:: Heydarpour, Parsa
Keyword:: Instability of column, Slender RC bridge column, P-Delta effect, Performance based design, Bridge column design, and Displacement ductility limit state
GW Unit:: Civil & Environmental Engineering
Degree:: M.S.
Advisor:: Silva, Pedro F
Committee Member(s):: Manzari, Majid T and Badie, Sameh S
Resource Type:: Thesis or Dissertation

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