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Articles 1 - 30 of 205
Full-Text Articles in Entire DC Network
Determining Transverse Design Forces For A Next-D Bridge Using 3d Finite Element Modeling, Robert Funcik
Determining Transverse Design Forces For A Next-D Bridge Using 3d Finite Element Modeling, Robert Funcik
All Theses
This thesis looks into the use of 3D Finite Element Modeling to determine the transverse design forces for short-span bridges built using the Northeast Extreme Tee with integral deck (NEXT-D) beam. Models were built using either solid elements or shell elements to represent the bridge deck, and the results were compared. The stiffness of the shear keys were taken into account during the modeling process. Results were compared to the AASHTO strip width method for design bridge decks, and the results showed that the strip width method would not be adequate for the design of NEXT-D bridges, so specific live …
Potential Impacts Of Climate Change On Water Resources And Water Quality Of Norris Lake, Tennessee, Yong-Gil Choi
Potential Impacts Of Climate Change On Water Resources And Water Quality Of Norris Lake, Tennessee, Yong-Gil Choi
Masters Theses
This study assessed the potential impacts of climate change on hydrology, water resources operation, and water quality of the Norris Lake area in Tennessee. To project future climate conditions, the simulation outputs for 2030s, 2050s, and 2070s from six general circulation models (GCMs) were extracted under two Intergovernmental Panel on Climate Change (IPCC) greenhouse gases emissions scenarios (A2 and B1 for high and low emissions, respectively) to consider the range of uncertainty. The outputs of the six GCMs were weighted by considering their accuracy to simulate the climate conditions observed from 1961 to 1990 to suggest an ensemble average. A …
Dimensional Stability Of Geosynthetic Clay Liners In Landfill Applications, Gregory R. Olsen
Dimensional Stability Of Geosynthetic Clay Liners In Landfill Applications, Gregory R. Olsen
Master's Theses
An investigation was conducted related to the dimensional stability of geosynthetic clay liners (GCLs) in landfill applications. Multiple occurrences of panel separation of overlap seams in GCLs have been documented; however, explanation for the relative contribution of various mechanisms causing shrinkage has been limited. A systematic test program was conducted to determine the effects of a variety of conditions on GCL dimensional stability.
Effects of initial moisture content, permeant type, and overburden pressure were tested by subjecting various GCL products to wet-dry cycles and measuring the dimensional change with each cycle. Different GCL types were each tested under various combinations …
Probabilistic Approaches To Stability And Deformation Problems In Braced Excavation, Zhe Luo
Probabilistic Approaches To Stability And Deformation Problems In Braced Excavation, Zhe Luo
All Dissertations
This dissertation is aimed at applying probabilistic approaches to evaluating the basal-heave stability and the excavation-induced wall and ground movements for serviceability assessment of excavation in clays. The focuses herein are the influence of spatial variability of soil parameters and small sample size on the results of the probabilistic analysis, and Bayesian updating of soil parameters using field observations in braced excavations.
Simplified approaches for reliability analysis of basal-heave in a braced excavation in clay considering the effect of spatial variability in random fields are presented. The proposed approaches employ the variance reduction technique (or more precisely, equivalent variance method) …
Fluid Mud Underflows In Coastal Dredge Disposal, Mijanur Chowdhury
Fluid Mud Underflows In Coastal Dredge Disposal, Mijanur Chowdhury
All Dissertations
This manuscript presents the results of a thorough theoretical and experimental investigation on fluid mud underflows generated in a typical coastal dredge disposal operation. The main goal of this investigation is to understand the propagation dynamics of fluid mud underflows that depends upon a number of factors, including: concentrations, rheological properties and released configurations of fluid mud. Laboratory experiments were conducted with different initial fluid mud concentrations in three different experimental set-ups: rectangular flume for constant volume release, rectangular flume for constant flux release, and a square pool for radial constant flux release of fluid mud. The experiments in the …
A Methodology For Estimating And Comparing The Lifecycles Of High-Build And Conventional Waterborne Pavement Markings On Primary And Secondary Roads In South Carolina, Joseph Robertson
All Theses
Highway pavement markings constitute a vital component of roadway transportation systems and provide crucial visual cues for the basic driver task of following the road. In 2008, the South Carolina Department of Transportation (SCDOT) initiated a multi-year study to evaluate pavement markings on non-interstate primary and secondary roads in South Carolina. This thesis discusses development of a methodology for estimating and comparing the lifecycles of high-build and conventional waterborne pavement markings based on retroreflectivity levels. The methodology was developed using nearly 3 years of field data from 66 sites throughout South Carolina. This thesis provides an overview of data collection …
Influence Of Pavement Type On Near Surface Air Temperature, David Duncan
Influence Of Pavement Type On Near Surface Air Temperature, David Duncan
All Theses
Effects from an Urban Heat Island (UHI) can be detrimental to the world as a whole. This study examines a collection of permeable and conventional pavements in South Carolina to determine how they relate to near surface air temperatures, which is an indicator of the UHI impact of an area. Three locations were used, each with a different selection of pavement type. Permeable and conventional forms of both asphalt and concrete were tested, as were some open graded friction course samples. Air temperatures were measured and recorded from the pavement surface up to an elevation of 60-in.
Multiple days of …
The Integration Of Building Information Modeling (Bim) Into Civil Engineering Curricula, Jason Cooksey
The Integration Of Building Information Modeling (Bim) Into Civil Engineering Curricula, Jason Cooksey
All Theses
Building Information Modeling (BIM) is an emerging technology used in the Architecture/Engineering/Construction (AEC) industry. The proliferation of BIM usage across the industry has been swift and prolific. Academia has lagged behind the adoption rate of the industry by not producing enough students with BIM exposure. Thus, the question is whether civil engineering curricula should provide an understanding of BIM technology to students entering the design and construction profession. The immediate objective of this research is to determine if it is important to provide exposure of BIM to undergraduate or graduate students in the civil engineering curricula and if so to …
Analyzing Of Tort Claims And Lawsuits Against South Carolina Department Of Transportation Through Classification And Regression Tree Analysis, Sara Familian
All Dissertations
After losing sovereign immunity in 1985, SCDOT employees now focus a significant amount of time in processing tort claims and lawsuits filed against the agency. This is an important issue for transportation agencies considering the fact that money spent defending tort claims and lawsuits, is no longer available for safety and mobility improvements on the state highway system.
The South Carolina Department of Transportation (SCDOT) processes approximately one thousand claims per year and is engaged in nearly one hundred lawsuits per year. SCDOT has paid just over a half million ($523,607) to settle on 1007 claims - approximately 1/3 of …
Influence Of Warm Mix Additives Upon High Rap Asphalt Mixes, William Rogers
Influence Of Warm Mix Additives Upon High Rap Asphalt Mixes, William Rogers
All Dissertations
This study was conducted to determine the effect of warm mix (WMA) modifiers on asphalt mixes containing high percentages of reclaimed asphalt pavement (RAP). Mixes were created using three aggregate sources, four RAP percentages (0%, 20%, 35%, and 50%), and three warm mix modifiers (HMA, zeolite, and Sasobit®). Base binders from the same source (PG 64 -22, 58 -28, 52 -28) and one rejuvenator were used for each mix to ensure the final blended binder grade was at least PG 64 -10.
Specimens were created at HMA or suggested WMA temperatures and tested for rut depth, indirect tensile strength (ITS), …
Laser Particulate Counter Calibration To A Micro-Orifice Uniform-Deposit Impactor, Benjamen Fredrich Seely
Laser Particulate Counter Calibration To A Micro-Orifice Uniform-Deposit Impactor, Benjamen Fredrich Seely
Boise State University Theses and Dissertations
In semi-arid regions, like southwest Idaho, snowmelt is a significant source of water. Anthropogenic activities continue to increase demand for this vital natural resource. Water resource managers must be able to quantify both the timing and quality of snowmelt. Atmospheric contaminants can deposit on the snow, altering its physical properties. For example, deposition of atmospheric particulate matter (PM) can cause snow to darken, thereby increasing radiative forcing on the snowpack, potentially causing a change in snowmelt timing.
This research is to calibrate a laser particulate counter (LPC) to a federal reference standard. The LPC provides real-time PM concentration data and …
Hydraulic Conductivity Of Environmentally Controlled Landfill Liner Test Pad, Camila Maldonado Soria Galvarro
Hydraulic Conductivity Of Environmentally Controlled Landfill Liner Test Pad, Camila Maldonado Soria Galvarro
Civil Engineering Undergraduate Honors Theses
Laboratory and field hydraulic conductivity tests have been conducted on soil samples to develop and verify the zone of acceptance for liner placement. Compaction testing and flexible wall hydraulic conductivity tests were performed on fifteen (15) samples to determine the dry unit weight, molding water content, and laboratory permeability. Five of the fifteen samples were compacted at Standard proctor energy, five were compacted at 75 percent of Standard proctor energy, and five were compacted at 50 percent of Standard proctor energy. The results obtained from the laboratory portion of the testing program (the zone of acceptance) are presented. A ten …
Temporal Pier Scour Evolution Under Stepped Hydrographs, Mark Schillinger
Temporal Pier Scour Evolution Under Stepped Hydrographs, Mark Schillinger
All Theses
The present study was aimed at measuring the scour hole profile at bridge piers under clear water scour. Scour tests were performed under both steady state flow and under stepped hydrographs. Multiple smaller flood events were run to determine how flood history affects scour hole development. Various equilibrium scour depth equations and proposed temporal scour models were compared. The similarity of the scour hole profiles with time and flow history were evaluated.
Experiments were conducted in a 14.8 m long, 1.19 m wide, 1.22 m deep rectangular flume with a model bridge pier. A uniform sediment bed (d50= …
Fault-Tree Model For Bridge Collapse Risk Analysis, Caitlyn Davis-Mcdaniel
Fault-Tree Model For Bridge Collapse Risk Analysis, Caitlyn Davis-Mcdaniel
All Theses
Bridges are vital components of the United States surface transportation infrastructure and, moreover, support the growth of our nation's economy. However, over the past few decades the design capacity and service condition of many bridges in the U.S. has been challenged. Numerous incidents of bridge collapse call for an urgent need to develop a systematic method of assessing the failure risks and identifying the initiating events that can lead to a bridge collapse. This thesis presents a process of bridge failure risk analysis through fault-tree modeling and identification of specific countermeasures, to minimize failure risk, related to structural health monitoring …
Development And Application Of A Three-Dimensional Probabilistic Wind-Borne Debris Trajectory Model, James Grayson
Development And Application Of A Three-Dimensional Probabilistic Wind-Borne Debris Trajectory Model, James Grayson
All Theses
This research presents a probabilistic debris trajectory model adapted from current 6-degree-of-freedom (6-DoF) deterministic models, in which the aleatoric (inherent) uncertainty is explicitly considered in the proposed probabilistic model. While the inherent randomness in the debris flight trajectory is irreducible due to the wind turbulence, variation in wind direction, gustiness of the wind event and so forth, the proposed probabilistic model seeks to address these uncertainties through Monte Carlo simulations with the appropriate statistical distributions applied to the governing equations of motion of the debris. Verification of the probabilistic debris trajectory model is performed through an analytical and visual comparison …
Development Of A Scale Model Wind Turbine For Testing Of Offshore Floating Wind Turbine Systems, Heather Rae Martin
Development Of A Scale Model Wind Turbine For Testing Of Offshore Floating Wind Turbine Systems, Heather Rae Martin
Electronic Theses and Dissertations
This thesis presents the development of a 1/50th scale 5 MW wind turbine intended for wind and wave basin model testing of commercially viable floating wind turbine structures. The design is based on a popular 5 MW wind turbine designed by the National Renewable Energy Laboratory (NREL) commonly utilized in numerical modeling efforts. The model wind turbine is to accompany generic floating model platforms for basin model testing. The ultimate goal of the model development testing program is to collect data for validating various floating wind turbine simulation codes such as those developed by NREL. This thesis will present an …
Effects Of High-Impedance-Contrast Boundary Upon Multi-Modal Seismic Surface Wave Data, Prajwol Tamrakar
Effects Of High-Impedance-Contrast Boundary Upon Multi-Modal Seismic Surface Wave Data, Prajwol Tamrakar
UNLV Theses, Dissertations, Professional Papers, and Capstones
Synthetic studies and analyses of an experimental dataset were conducted to address the use of Rayleigh-type surface waves for estimation of shear wave velocity (VS) profiles of shallow bedrock sites. The shallow bedrock presents a high impedance contrast boundary which causes surface wave energy to be partitioned to higher modes. Idealized studies of hypothetical datasets and root-mean-squared calculations of error surfaces showed that if reliable dispersion data are available over a broad frequency spectrum, the VS profile can be recovered using the fundamental mode alone. However, when dispersion data are limited to a relatively narrow frequency band representing what might …
Analysis And Parameterization Of The Flight Of Ember Generation Experiments, Hillary Harris
Analysis And Parameterization Of The Flight Of Ember Generation Experiments, Hillary Harris
All Theses
This thesis presents a study on ember flight modeling based on a series of wind tunnel experiments. The purpose of these experiments and the data collected was to provide the input conditions for an ember flight model in order to compare and validate the model predictions. An analysis was performed which determined the sensitivity of model predictions of downwind mass distribution to uncertainties in the model input parameters.
From the wind tunnel experiments, flight distances were measured and characteristic ember size distributions were obtained from the collected data. A flight model was developed based on standard models published in the …
Robust Design And Monitoring Tools For Sustainable And Resilient Structural Design And Infrastructure Management, Sarah Dalton
Robust Design And Monitoring Tools For Sustainable And Resilient Structural Design And Infrastructure Management, Sarah Dalton
All Theses
Structural systems are subject to inherent uncertainties due to the variability in many hard-to-control `noise factors' that include but are not limited to external loads, material properties, and construction workmanship. Two design methodologies have been widely accepted in the practicing engineering realm to manage the variability associated with operational structures: Allowable Stress Design (ASD) and Load and Resistance Factor Design (LRFD). These traditional approaches explicitly recognize the presence of uncertainty; however, they do not take robustness against this uncertainty into consideration. Overlooking this robustness against uncertainty in the structural design process has two drawbacks. First, the design may not satisfy …
Reducing Moisture Damage In Asphalt Mixes Using Recycled Waste Additives, Anthony John Boyes
Reducing Moisture Damage In Asphalt Mixes Using Recycled Waste Additives, Anthony John Boyes
Master's Theses
This thesis has determined that using fly ash as a mineral filler in asphalt pavements can help strengthen and reduce asphalt moisture damage. Also, dynamic shear rheometer tests show that these additives have a stiffening effect on asphalt binder. Moisture related damage is considered one of the main causes of asphalt pavement failure. As water infiltrates a layer of asphalt, it slowly strips away asphalt binder, weakening the aggregate/binder bond. This process, combined with the cyclic loading of traffic, can lead to several different types of asphalt failure including rutting, raveling, bleeding, and cracking. For several decades, research has been …
Influence Of Recycled Asphalt Shingles On Asphalt Binder Content, Mixture Stiffness, And Laboratory Rutting Performance, Joshua David King
Influence Of Recycled Asphalt Shingles On Asphalt Binder Content, Mixture Stiffness, And Laboratory Rutting Performance, Joshua David King
Graduate Theses and Dissertations
Recycled asphalt shingles (RAS) is a technology in which pavement costs can be reduced significantly and pavement properties may be enhanced. Also, incorporating shingles into pavements reduces the impacts of waste shingles in landfills, preserving our environment. However, for this new technology to be practical for implementation, a better understanding of how the ground shingles affect the properties of the asphalt is necessary. The purpose of this research was to examine the effects of recycled asphalt shingles on asphalt binder content, mixture stiffness, and laboratory rutting performance. For this project, shingles were added to hot mix asphalt mixtures at 2.5, …
Development Of A Structured Concrete Thermocline Thermal Energy Storage System, Bradley M. Brown
Development Of A Structured Concrete Thermocline Thermal Energy Storage System, Bradley M. Brown
Graduate Theses and Dissertations
The past couple of decades have shown a concern when considering the way the world obtains its power. The focus has been switching from fossil fuels that have been used for hundreds of years to renewable energy sources, such as the sun. Solar energy is readily and infinitely available for harnessing. One problem with solar energy, though, is its inability to be used during the night time and during cloud covered weather. A solution to this problem is the use of energy storage mechanisms. For solar plants that use solar thermal energy (concentrating solar power plants), thermal energy storage (TES) …
The Marked Tree Site: Evaluation Of Geosynthetic Reinforcements In Flexible Pavements, Taylor Mitchell Goldman
The Marked Tree Site: Evaluation Of Geosynthetic Reinforcements In Flexible Pavements, Taylor Mitchell Goldman
Graduate Theses and Dissertations
This document presents findings from a three-year, full-scale, field research project aimed at determining the benefits of using geosynthetic reinforcements to improve the performance of flexible pavements constructed over poor subgrade soils. The test site, known as the Marked Tree site, is an 850-ft (258-m) long segment of low-volume frontage road along Highway 63 in the town of Marked Tree, Arkansas. The site, constructed in 2005, consists of seventeen 50-ft (15.2-m) long flexible pavement test sections with various types of geosynthetic reinforcements (woven and nonwoven geotextiles, and geogrids), which were all positioned at the base-subgrade interface, and two different nominal …
Seismic Microzonation Of Great Toronto Area And Influence Of Building Resonances On Measured Soil Responses, Dimitar Genchev Mihaylov
Seismic Microzonation Of Great Toronto Area And Influence Of Building Resonances On Measured Soil Responses, Dimitar Genchev Mihaylov
Electronic Thesis and Dissertation Repository
A pilot seismic microzonation of the Greater Toronto Area (GTA) is used to establish the conditions and limitations of geophysical methods for site response investigations in city conditions. Maps of fundamental soil resonant frequencies, amplifications at these frequencies and interpolated average shear wave velocity of top 30 m of soil profile (VS- 30) used in soil classification were compared to the maps of drift thickness and surficial geology for the GTA. The non-applicability of the interpolated VS-30 map for site classification between measured test points is indicated. It is also shown that the soil response cannot be estimated properly using …
Strengthening Of Steel Beams Using Mechanically Anchored Carbon Fiber Reinforced Polymers Laminates, Mohammed Monir Makin Ajan Alhadid
Strengthening Of Steel Beams Using Mechanically Anchored Carbon Fiber Reinforced Polymers Laminates, Mohammed Monir Makin Ajan Alhadid
Theses
على مدى العقدين المنصرمين من الزمن تم إستخدام الألياف البلاستيكية المسلحة بشكل فعال و عملي في تقوية وتدعيم المنشأت الهندسية المختلفة بما في ذلك العناصر الإنشائية الخرسانية والطابوقية والخشبية, وطوال هذه الفترة الزمنية جرت أبحاث مفصلة حول العالم لدراسة مدى فاعلية مثل هذه الألياف في تقوية العناصر المعدنية و ذلك عن طريق تثبيتها بواسطة مواد شديدة الإلتصاقو ولقد كشفت الدراسات المنشورة أن هذه الطريقة في التثبيت سواءً في العناصر الخرسانية أو العناصر المعدنية تؤدي الي الانهيار الفجائي للعناصر المدعمة عند قيم التحميل المرتفعة ما لم يتم اتخاذ احتياطات أخرى وخصوصاً عند أطراف هذه الألياف، وبالمقابل فإن هناك دراسات أخرى أجريت …
Effects Of Column Stiffness On Seismic Behavior Of Steel Plate Shear Walls, Xuhua Guo
Effects Of Column Stiffness On Seismic Behavior Of Steel Plate Shear Walls, Xuhua Guo
Master's Theses
Steel plate shear walls (SPSWs) are a lateral force resisting system consisting of thin infill steel plates surrounded by boundary frame members. The infill steel plates are allowed to buckle in shear and subsequently form diagonal tension field actions during earthquake events. Hysteretic energy dissipation of this system is primarily achieved through yielding of the infill plates. Conceptually, in a SPSW system with ideally rigid columns pinned to ground, the infill plates at different stories will yield simultaneously as a result of the lateral loads. However, when the columns become flexible, infill plate yielding may initially occur at one story …
Experimental And Numerical Evaluation Of Cured In Place Pipe Lining System For High Temperature Applications In Sewer Pipes, Shaurav Z. Alam
Experimental And Numerical Evaluation Of Cured In Place Pipe Lining System For High Temperature Applications In Sewer Pipes, Shaurav Z. Alam
Doctoral Dissertations
Some of the older cities across North America and Europe had been using steam driven HVAC systems since beginning of the last century. Consolidated Edison (Con Ed.) of New York operates the New York City steam system, the largest commercial district heating system in the world, with more than 100 miles of transmission and distribution pipes serving Manhattan Island. Other steam district systems exist in San Francisco, Harrisburg, Minneapolis, Pittsburgh, San Diego, and Detroit, some dating back to 1903. In those cities the sewer pipes are used as venues for discharging the waste steam condensate from the HVAC system.
The …
Vortex Shedding From Elongated Bluff Bodies, Zachary J. Taylor
Vortex Shedding From Elongated Bluff Bodies, Zachary J. Taylor
Electronic Thesis and Dissertation Repository
As the spans of suspension bridges increase, the structures become inherently flexible. The flexibility of these structures, combined with the wind and particular aerodynamics, can lead to significant motions. From the collapse due to flutter of the Tacoma Narrows Bridge to the case of vortex-induced vibrations (VIV) of the Storebælt Bridge, it is evident that a better understanding of the aerodynamics of these geometries is necessary. The work herein is motivated by these two problems and is presented in two parts.
In the first part, the focus is on the physical mechanisms of vortex shedding. It is shown that the …
Impacto Socioeconómico Generado Por La Operación De Los Buses Alimentadores De Transmilenio En Los Corredores Viales De Zonas De Unidades Residenciales Nuevas En El Sector Del Tintal De La Localidad De Kennedy, Iván Camilo Gutiérrez Rodríguez
Impacto Socioeconómico Generado Por La Operación De Los Buses Alimentadores De Transmilenio En Los Corredores Viales De Zonas De Unidades Residenciales Nuevas En El Sector Del Tintal De La Localidad De Kennedy, Iván Camilo Gutiérrez Rodríguez
Ingeniería Civil
El paso de los buses alimentadores de TransMilenio, tiene la básica intención de mejorar las condiciones de movilidad de los habitantes del sector en donde estos operan rutas alimentadoras, sin embargo, la causa de su paso ha generado un gran deterioro en la maya vial del sector del Tintal, ubicado al sur-occidente de Bogotá, generando así un impacto socio-económico negativo en la comunidad, ya que los habitantes manifiestan que la desvalorización de sus predios aumenta cada día más, al mismo tiempo que las vías también están más deterioradas. El estudio se realizó aplicando una encuesta, con el fin de determinar …
Implementing A Long-Term Bridge Monitoring Strategy For A Composite Steel Girder Bridge, Shelley Plude
Implementing A Long-Term Bridge Monitoring Strategy For A Composite Steel Girder Bridge, Shelley Plude
Master's Theses
The University of Connecticut and the Connecticut Department of Transportation have established a long-term bridge health monitoring system to monitor critical vulnerabilities in a group of bridges throughout the state. This research focuses on a three-span, simply supported composite steel girder bridge carrying three lanes of highway traffic. It has been a part of the University of Connecticut and Connecticut Department of Transportation monitoring network since 2004 and is fitted with 20 strain gauges located at midspan at the top and bottom of the web of each girder.
To monitor the critical vulnerabilities of the bridge, it is important to …