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Articles 1 - 30 of 33
Full-Text Articles in Engineering
Forecasting Geotechnical Parameters From Electrical Resistivity And Seismic Wave Velocities Using Artificial Neural Network Models, Fatema Tuz Johora
Forecasting Geotechnical Parameters From Electrical Resistivity And Seismic Wave Velocities Using Artificial Neural Network Models, Fatema Tuz Johora
Electronic Theses and Dissertations
Geotechnical measurements of soil parameters used in the design of infrastructure provide information at a specific point of the ground. The use of limited point data may result in greater uncertainty and less reliability in design. Geophysical methods are non-invasive, less time-consuming, and provide continuous spatial information about the soil. However, geophysical information is not in terms of engineering parameters. Correlations between geotechnical parameters and geophysical parameters are needed to facilitate the use of geophysical information in geotechnical designs. The current research is focused on two geophysical methods; electrical resistivity (ER) and seismic wave velocity (S-wave and P-wave). Artificial neural …
Computational Modeling Of Climate Attributes And Condition Deterioration Of Concrete Highway Pavements, Salma Sultana
Computational Modeling Of Climate Attributes And Condition Deterioration Of Concrete Highway Pavements, Salma Sultana
Electronic Theses and Dissertations
An efficient and safe road network secures the nation’s economy and prosperity by providing public mobility and freight transport. Maintenance and rehabilitation of the road network cost billions of dollars annually. Road and highway infrastructures performance in any country is impacted by load repetitions and it is further compromised by climate attributes and extreme weather events. Damages to roads and bridges are among the infrastructure failures that have occurred during these extreme events. If maintenance and rehabilitation are not done promptly, the damages to the road caused by heavy traffic and extreme climate may lead to life-threatening conditions for road …
Effectiveness Of Seismic Bearings On A Typical Isolated Two-Column Rc Bridge Pier Located In North Mississippi, Hemant Raj Joshi
Effectiveness Of Seismic Bearings On A Typical Isolated Two-Column Rc Bridge Pier Located In North Mississippi, Hemant Raj Joshi
Electronic Theses and Dissertations
The 2020 ASCE infrastructure report card has assigned a letter grade of D- for bridges in Mississippi based on poor to fair condition ratings with many approaching the end of their useful service lives. Bridges in northern Mississippi lie up to 100 miles from the New Madrid Fault and fall into the Region 3 Seismic Performance Category defined by AASHTO. The primary objective of this study is to evaluate the performance of commercially available bridge bearings on a common bridge pier type used in northern MS under the combined action of superstructure gravity and lateral seismic loads. The use of …
Electromagnetic Survey Design Using Artifical Neural Networks, Shariful Islam Sharif
Electromagnetic Survey Design Using Artifical Neural Networks, Shariful Islam Sharif
Electronic Theses and Dissertations
Acquiring geophysical information requires selection of the geophysical method based upon the defining physical property and a survey design with adequate resolution but cost effective based upon the size of the area to be surveyed. The objective of this study is to use artificial neural nets (ANNs) to design an optimal survey. The developed approach is tested for the case of soil pipe surveying using electromagnetics. Soil pipes are tortuous voids located within 1.5 m depth of the ground surface. They trend perpendicular to the slope and have cross-sectional dimensions on the order of millimeters to tens of centimeters. The …
Damage Detection Using Destructive Testing Of A Reinforced Concrete Slab, Michael Edward Daves
Damage Detection Using Destructive Testing Of A Reinforced Concrete Slab, Michael Edward Daves
Electronic Theses and Dissertations
Visual inspection is one of the primary tools for evaluating the health of bridges as more reach or exceed their intended lifespan. Bridge deterioration must be monitored to ensure continued safety, so owners need maintenance reports to decide on corrective actions. Strategic repair can offer asset managers the benefit of saving money and time; thus, knowing where to locate and what type of repairs can be challenging when relying on visual techniques alone. A tool designed to aid bridge inspectors is the SHE^tm program, which quantitatively measures damage location and severity for any set of time data.
Decoding And Optimizing Magnesium Phosphate Binders For Additive Construction Applications, Hashem Khaled Almashaqbeh
Decoding And Optimizing Magnesium Phosphate Binders For Additive Construction Applications, Hashem Khaled Almashaqbeh
Electronic Theses and Dissertations
This work aims to give more insight about the physical, mechanical, thermal, and chemical performance of the MPC paste composites. Our primary outcome from this research is to improve the MPC composites with different additives, including boric acid, GnP, and acetic acid for potential utilization in 3DcP applications. Furthermore, Martian and Lunar regolith simulants can be mixed with the MPC composites to create mortars as a possible extraterrestrial 3DP in-situ construction material mainly to support the NASA habitation exploration mission.
Investigating The Use Of Passive Acoustics As A Surrogate Method Of Monitoring Coarse Bedload Transport In Rivers And Streams Via Laboratory Experiments And Field Studies, Bradley Goodwiller
Investigating The Use Of Passive Acoustics As A Surrogate Method Of Monitoring Coarse Bedload Transport In Rivers And Streams Via Laboratory Experiments And Field Studies, Bradley Goodwiller
Electronic Theses and Dissertations
The movement of coarse gravel in rivers in streams is important for many applications including wildlife habitation, river morphology, infrastructure maintenance and marine navigation. Physical sampling remains the most accurate method of determining coarse bedload transport but it can be expensive, dangerous and flow intrusive. Surrogate methods of monitoring bedload transport is an active area of research worldwide. One such method is the use of passive acoustics to record the sound generated when gravel particles in motion impact each other or the particles on the bed. This dissertation presents research and development that has been conducted on three key areas …
Computational Modeling And Simulations Of Condition Deterioration To Enhance Asphalt Highway Pavement Design And Asset Management, Zul Fahmi Bin Mohamed Jaafar
Computational Modeling And Simulations Of Condition Deterioration To Enhance Asphalt Highway Pavement Design And Asset Management, Zul Fahmi Bin Mohamed Jaafar
Electronic Theses and Dissertations
A nation’s economy and prosperity depend on an efficient and safe transportation network for public mobility and freight transportation. A country’s road network is recognized as one of the largest public infrastructure assets. About 93 percent of 2.6 million miles of paved roads and highways in the United States (U.S.) are surfaced with asphalt. Longitudinal roughness, pavement cracking, potholes, and rutting are the major reasons for rehabilitation of asphalt roads. Billions of dollars are required annually for the maintenance and rehabilitation of road networks. If timely maintenance and rehabilitation are not performed, the pavement damages inflicted by heavy traffic repetitions …
Optimizing The Performance Of Complex Engineering Systems Aided By Artificial Neural Networks, Khalil Qatu
Optimizing The Performance Of Complex Engineering Systems Aided By Artificial Neural Networks, Khalil Qatu
Electronic Theses and Dissertations
In the first problem Polyetherimide graphene nanoplatelets papers (PEIGNP) were tested with different graphene loadings varying from 0-97 weight percent (WT%). The resulting stress-strain curves were utilized to develop two ANN models. Stress-controlled and strain-controlled models. Both models shoan excellent correlation to the experimental. Several Mechanical properties were calculated from the predicted stress-strain curves namely; toughness maximum strength maximum strain and maximum tangent modulus. Both models captured the same overall behavior of the PEIGNP composite. However the strain-controlled model was found to predict lower stress than the stress-controlled model. Finally a Graphical User Interface (GUI) was developed to aid in …
Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms, Leti Teklu Wodajo
Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms, Leti Teklu Wodajo
Electronic Theses and Dissertations
Geophysical methods provide a rapid, economical, non-invasive, and spatial coverage of the subsurface in terms of geophysical properties. On the other hand, geophysical methods can generate multiple geophysical anomalies. An anomaly on a seismic refraction or an electrical resistivity tomogram is an area that has different values compared to its surrounding. Geophysical anomalies in dams and levees can be due to the overall heterogeneity of the subsurface, structures such as principal spillways, artifacts of inversion software, or to a true compromised location, such as an air void due to internal erosion or seepage. Therefore, there is uncertainty involved with using …
Flood Disaster Resilient Bridge Structures For Sustainable Bridge Management Systems, Alper Durmus
Flood Disaster Resilient Bridge Structures For Sustainable Bridge Management Systems, Alper Durmus
Electronic Theses and Dissertations
Extreme weather events are occurring at an increasing ferocity and frequency. Floods are the most comand damaging natural disaster. More than 4,400 occurrences of flood disasters have been reported globally between 1900 and 2016. As a result, around seven million people were killed and millions more were displaced. Climate impacts are expected to intensify weather related flooding events, and sea level rise expected worldwide will increase the risk of coastal disasters. Transportation infrastructure, vital to the economy and society of every country, is especially prone to the inland and coastal floods. Bridge structures are under the constant threat of these …
Development Of A Dynamic Coupled Hydro-Geomechanical Code And Its Application To Induced Seismicity, Md Mamun Miah
Development Of A Dynamic Coupled Hydro-Geomechanical Code And Its Application To Induced Seismicity, Md Mamun Miah
Electronic Theses and Dissertations
No abstract provided.
Stability Sensitivity Of Low-Rise Steel-Moment Framed Buildings To Hazard-Independent Damage, Trey Reynolds Powell
Stability Sensitivity Of Low-Rise Steel-Moment Framed Buildings To Hazard-Independent Damage, Trey Reynolds Powell
Electronic Theses and Dissertations
Structural stability has been the subject of much research in recent years. Simply, structural stability may be vieas the ability of the structure’s response to be relatively unaffected by perturbations to its system. Stability of low-rise steel-moment framed buildings and their sensitivity to perturbations from significant damage are the focus of this work. Perturbations, or changes from the normal state of the structural system, have the ability to affect the structural response. Second-order geometric effects imposed through column axial loads, and/or initial out-of-plumbness during the construction process, are a comperturbation in steel framing systems. If the structural members subjected to …
Validation Of Integrated Coast-Ocean Model Cche2d-Coast And Development Of Wind Model, Afshin Gazerzadeh
Validation Of Integrated Coast-Ocean Model Cche2d-Coast And Development Of Wind Model, Afshin Gazerzadeh
Electronic Theses and Dissertations
The eastern and southern coastlines of the United States are two of the most cyclone-prone areas of the world. The effects of tropical cyclones vary mainly depending on wind intensity and geological features of the coast that it is crossing. Higher winds potentially generate higher storm surges and consequently larger floods occur along the coastlines. Therefore, it is critical to accurately predict winds, storm surge, and waves associated with a hurricane. In the present study, an integrated coastal and ocean process model, CCHE2D-Coast, is validated by assessing the model’s capabilities in simulating coast-ocean circulations driven by the astronomical tides on …
Cargo Shipping Demand Modeling, Infrastructure Mapping, And Emission Impacts Of Selected U.S. Ports, Robert Coffman Richardson
Cargo Shipping Demand Modeling, Infrastructure Mapping, And Emission Impacts Of Selected U.S. Ports, Robert Coffman Richardson
Electronic Theses and Dissertations
This research included shipping demand modeling, infrastructure asset mapping, and impacts of carbon dioxide (co2) emission. The current volume of imports and exports was reviefor U.S. ports in the east coast, gulf coast, and west coast regions. The import and export of goods is a major part of the U.S. economy, and the volume of cargo handled by U.S. ports is expected to increase in the future as population increases. The major motivation for this thesis was the need for U.S. ports to make plans now to accommodate this expected growth in volume. Ports distribute commodities throughout the U.S., and …
Economic Viability And Societal Benefits Of Integrated Multimodal Freight Corridors And Sustainable Passenger Transportation, Seth Austin Cobb
Economic Viability And Societal Benefits Of Integrated Multimodal Freight Corridors And Sustainable Passenger Transportation, Seth Austin Cobb
Electronic Theses and Dissertations
No abstract provided.
Measurements Of Fluvial Sediments Using A Single-Frequency Acoustic Attenuation System, Thomas Alexander Kajdan
Measurements Of Fluvial Sediments Using A Single-Frequency Acoustic Attenuation System, Thomas Alexander Kajdan
Electronic Theses and Dissertations
Suspended sediments are a global-scale pollutant that threaten the integrity of our waterways and pose an environmental threat to many aquatic ecosystems. Innovative techniques are required to continuously monitor this pollutant. Ultrasonic acoustic measurements have the potential to improve the temporal resolution of fluvial sediment data. This work investigates the use of a prototype field grade single-frequency acoustic attenuation system that was developed at the National Center for Physical Acoustics (NCPA), located at the University of Mississippi. This field-deployable unit consists of two 20 MHz immersion transducers that are aligned in a "pitch-catch" configuration at a fixed distance of 18 …
Non-Hydrostatic Models For Wave Propagation, Breaking, And Run-Up, Zhangping Wei
Non-Hydrostatic Models For Wave Propagation, Breaking, And Run-Up, Zhangping Wei
Electronic Theses and Dissertations
This dissertation develops a series of non-hydrostatic pressure wave models based on the finite element free surface flow model, CCHE2D, for simulating propagation, breaking, and run-up of coastal wave processes. The first non-hydrostatic formulation presented in this dissertation directly introduces a non-hydrostatic pressure module into CCHE2D. An edge-based pressure allocation method is implemented, and a depth-integrated vertical momentum equation is introduced. The depth-integrated horizontal momentum equations are solved for a provisional velocity field, and then the non-hydrostatic pressure is obtained by satisfying the divergence-free velocity field condition, subsequently the velocity field is corrected by the non-hydrostatic pressure. Finally the free …
Development And Validation Of The Structural Health Evaluation (SheTm) Program, Steven Worley
Development And Validation Of The Structural Health Evaluation (SheTm) Program, Steven Worley
Electronic Theses and Dissertations
No abstract provided.
3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds, Reza Marsooli
3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds, Reza Marsooli
Electronic Theses and Dissertations
Irvin Cooper was a prominent music educator in boys’ adolescent voice change research. Dr. Cooper developed the Cambiata concept as a method for teaching boys to sing throughout the voice change. This method was starkly different from the traditional model that encouraged the changing voice to be rested during the voice change. While working as the music supervisor for the Montreal protestant school system, Cooper developed his method of having boys sing during the voice change, which included arrangements and compositions specifically for changing voices. Cooper taught many prominent researchers of adolescent voice change, including Don Collins and John Cooksey. …
Geotechnical Technique To Strengthen Traditional I-Walls Through The Use Of Composite Material, Jimmy Irby Jackson
Geotechnical Technique To Strengthen Traditional I-Walls Through The Use Of Composite Material, Jimmy Irby Jackson
Electronic Theses and Dissertations
On Monday, August 29, 2005, Hurricane Katrina struck the southern gulf coast of the United States. Hurricane Katrina produced record high amounts of surge water along the coastal regions, that over topped and eroded levees and flood walls, inevitably flooding the entire city of New Orleans. After Hurricane Katrina, the Department of Homeland Security approved a research grant to The University of Mississippi to develop effective but economic technique of strengthening existing I-walls. Using composite materials, a new retrofitting technique was developed to increase the stability of existing I-walls by implementing composite caps. For economical and practical testing, scale models …
Nanoenhanced Polyurea As A Blast Resistant Coating For Concrete Masonry Walls, Heather Kathryn Daniell Rivera
Nanoenhanced Polyurea As A Blast Resistant Coating For Concrete Masonry Walls, Heather Kathryn Daniell Rivera
Electronic Theses and Dissertations
Blast impact is a major concern in the world today. The leading cause of death due to blast impacts is rapidly moving debris. To prevent this many researchers are looking for methods of improved blast resistance for concrete masonry walls. However, many available protective coatings are not flame retardant. This thesis focuses on nanoenhanced polyurea for applications in improving blast resistance, while possessing improved flame retardancy, of concrete masonry walls. The polyurea that is being researched is enhanced with nanoadditives in an effort improve both blast and fire resistance. These materials are dynamically tested and those showing marked improvement are …
Mechanical Properties Of Portland Cement And Its Constituents At The Nano-Level, Brent French
Mechanical Properties Of Portland Cement And Its Constituents At The Nano-Level, Brent French
Electronic Theses and Dissertations
The following is a summary of research for a portion of the project titled Nano to Continuum Multi-Scale Modeling Techniques and Analysis For Cementitious Materials Under Dynamic Loading in association with North Carolina Agricultural & Technical State University and the US Army. This research investigates several attempts at creating a better Portland cement model at the atomistic level through molecular dynamics simulations. These models are modified to simulate damage to the basic cement structure, and are simulated using several combinations of forcefields and molecular dynamics tools. Experimental techniques such as nanoindentation, atomic force microscopy, and x-ray diffraction are applied to …
Physical, Mechanical And Chemical Aging Of Polyurea Nanocomposites, Ghanshyam Pal
Physical, Mechanical And Chemical Aging Of Polyurea Nanocomposites, Ghanshyam Pal
Electronic Theses and Dissertations
Two component polyurea systems, on one hand, are gaining popularity as corrosion and abrasion resistant coatings and linings while on the other hand there are a few polyurea compositions being used as barrier against blast and ballistic threats to protect nation's critical infrastructure. Physical properties of polymer composites can be tailored with appropriate choice of type, size and amount of reinforcement. In general, nano-sized reinforcements provide better reinforcing over conventional reinforcements due to higher surface to volume ratio. In this dissertation, the first aim is to study effect of nanoreinforcement addition on the overall character (mechanical, chemical and microstructural) of …
Fe Modeling In Support Of Vibration Based Damage Detection In Bridges, James Kyle Bethay
Fe Modeling In Support Of Vibration Based Damage Detection In Bridges, James Kyle Bethay
Electronic Theses and Dissertations
Vibration based damage detection in bridges is examined with the objective of defining a relationship between substructure stiffness degradation and frequency and mode shape modulation induced by damage. The relationship is explored through finite element modeling of primarily an experimental representation of a three-span concrete bridge structure located at the entrance to the main campus of The University of Mississippi in Oxford. Equivalent beam and 3D finite element models are created of an experimental setup incorporating levels of damage simulated using deck slab bearing pads of varying stiffness. Eigenvalue analysis is performed to examine the change of frequencies for characteristic …
Finite Element Modeling Of Seismic Wave Propagation In Earthen Embankments, Binyam Tadese
Finite Element Modeling Of Seismic Wave Propagation In Earthen Embankments, Binyam Tadese
Electronic Theses and Dissertations
The detection of internal seepage zones in embankments (dams and levees) by geophysical seismic techniques such as seismic refraction is limited by a number of factors. Some factors are associated with inversion and smoothing problems during processing, while others are associated with the natural characteristics of embankments and seepage anomalies. In this research, changes in the seismic response associated with: embankment soil compositions and moisture, characteristics of the seepage zone, presence of water in the reservoir, and shape of embankment was studied via 2D and 3D finite element (FE) embankment models. Artificial reflections from external boundaries and numerical dispersion were …
Inspection Of Earthen Embankment Dams Using Time Lapse Electrical Resistivity Tomography, Jared Stewart Case
Inspection Of Earthen Embankment Dams Using Time Lapse Electrical Resistivity Tomography, Jared Stewart Case
Electronic Theses and Dissertations
According to the National Inventory of Dams (NID), the number of dams across the United States is approximately 85,000. Many of these dams are more than 50 years old and need vast attention to ensure their safety. It is difficult to obtain a full assessment of the dam just by visual inspections alone. This is because many problems associated with dam failure occur internally, which makes it difficult to be observed by the dam inspectors. Examples of these flaws are piping and seepage (flow of water through or around dam walls). It is in this area where geophysical methods can …
Geospatial Assessment Of Sustainable Built Infrastructure Assets And Flood Disaster Protection, Alper Durmus
Geospatial Assessment Of Sustainable Built Infrastructure Assets And Flood Disaster Protection, Alper Durmus
Electronic Theses and Dissertations
This research was initiated with a review and synthesis of infrastructure related to city and urban growth, built infrastructure to meet transportation needs and travel demand, and role of mass transit in reducing adverse impacts on the environment and greenhouse gas emissions. Floods are the most frequently occurring natural disaster in the world, which so far claimed millions of lives and resulted in billion-dollar economic costs. Built infrastructure assets in urban and rural areas are not spared from floods' aftermath. A major motivation for this thesis was the 2011 megaflood disaster of Thailand which devastated the green campus of Asian …
Experimental Damage Diagnosis Of A Model Three-Story Spatial Frame, Samantha Sabatino
Experimental Damage Diagnosis Of A Model Three-Story Spatial Frame, Samantha Sabatino
Electronic Theses and Dissertations
Structural damage can be induced by a variety of events from short-term abnormal stresses to long-term natural aging. Detection of changes in a structure's ability to withstand subsequent loads can aid decisions on safety, repair, rehabilitation, and demolition. Dynamic property shifts can show internal cracks and minor damage before propagation or failure occurs, but only if a proper indicator is selected. In order to evaluate potential damage indices, a three-story metal frame building was constructed. Using Star Modal software, dynamic structural properties were obtained from modal decomposition on experimental tap test responses. The natural frequencies and mode shapes of the …
Developing A Retrofitting System To Mitigate Floodwall Failures Of New Orleans, James Tyler Kidd
Developing A Retrofitting System To Mitigate Floodwall Failures Of New Orleans, James Tyler Kidd
Electronic Theses and Dissertations
No abstract provided.