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Articles 1 - 30 of 213
Full-Text Articles in Engineering
Dynamic Properties Of Railway Track And Its Components : A State-Of-The-Art Review, Sakdirat Kaewunruen, Alexander Remennikov
Dynamic Properties Of Railway Track And Its Components : A State-Of-The-Art Review, Sakdirat Kaewunruen, Alexander Remennikov
Faculty of Engineering - Papers (Archive)
Recent findings indicate one of major causes of damages, which is attributed to the resonant behaviours, in a railway track and its components. Basically, when a railway track is excited to generalised dynamic loading, the railway track deforms and then vibrates for certain duration. Dynamic responses of the railway track and its components are the key to evaluate the structural capacity of railway track and its components. If a dynamic loading resonates the railway track’s dynamic responses, its components tend to have the significant damage from excessive dynamic stresses. For example, a rail vibration could lead to defects in rails …
Dynamic Design Guidelines For Prestressed Concrete Sleepers, Alexander Remennikov, Martin H. Murray, Sakdirat Kaewunruen
Dynamic Design Guidelines For Prestressed Concrete Sleepers, Alexander Remennikov, Martin H. Murray, Sakdirat Kaewunruen
Faculty of Engineering - Papers (Archive)
Current design philosophy, outlined in AS 1085.14, is based on the analysis of permissible stresses resulting from quasi-static wheel loads and essentially the static response of concrete sleepers. In general, cracking can incur when the bottom fibre stress is larger than tensile strength of concrete. Premature cracking of prestressed concrete sleepers has been detected in railway tracks. The major cause of cracking is the infrequent but high-magnitude wheel loads produced by a small percentage of “out-of-round” wheels or railhead surface defects, which are crudely accounted for in AS 1085.14 by a single load factor. Based on the current design method, …
Evaluación Probabilística De La Amenaza Sísmica Regional Para Tunja, Gladys Patricia Molina Molina
Evaluación Probabilística De La Amenaza Sísmica Regional Para Tunja, Gladys Patricia Molina Molina
Ingeniería Civil
El presente trabajo contiene la evaluación probabilística de la amenaza sísmica para la Ciudad de Tunja, que está ubicada en la cordillera Oriental colombiana a los 05º32’07” de latitud Norte y 73º22’04” de longitud oeste. Tunja se encuentra en un área propensa a la actividad sísmica; en la zona se desarrollan varios sistemas de fallas activas. Según datos históricos, en los últimos 500 años la sismicidad de Tunja y su área cercana ha sido destacada. Esta investigación se desarrolló siguiendo los procedimientos de Hanks y Cornell (1994) que permite estimar las aceleraciones pico esperadas para periodos de retorno de 475, …
Análisis De La Influencia Del Refuerzo Transversal En El Confinamiento De Columnas De Sección Circular Y Rectangular Modeladas A Escala Reducida, Jhony Armando Sanchez Sierra
Análisis De La Influencia Del Refuerzo Transversal En El Confinamiento De Columnas De Sección Circular Y Rectangular Modeladas A Escala Reducida, Jhony Armando Sanchez Sierra
Ingeniería Civil
No abstract provided.
Investigation Of The Merging Of Two Axisymmetric Turbulent Jets, Jeffrey Smith
Investigation Of The Merging Of Two Axisymmetric Turbulent Jets, Jeffrey Smith
All Theses
A study was done to determine the converging distance of two axisymmetric turbulent jets and to compare the experimental results with the Reichardt hypothesis. This experiment consisted of measuring the velocity profiles of the two jets and manipulating the momentum ratio between the jets. Through testing, it was determined that the Reichardt hypothesis while efficient, over predicts the converging distance of the jets by up to 25% in some cases.
An Acoustic Doppler Velocimeter (ADV) was used to take measurements across the path of the jets and monitored the velocity and the turbulent kinetic energy. After observing the velocity profiles, …
Quantitative Rrna-Targeted Solution-Based Hybridization Assay Using Peptide Nucleic Acid Molecular Beacons, Xu Li, Eberhard Morgenroth, Lutgarde Raskin
Quantitative Rrna-Targeted Solution-Based Hybridization Assay Using Peptide Nucleic Acid Molecular Beacons, Xu Li, Eberhard Morgenroth, Lutgarde Raskin
Department of Civil and Environmental Engineering: Faculty Publications
The potential of a solution-based hybridization assay using peptide nucleic acid (PNA) molecular beacon (MB) probes to quantify 16S rRNA of specific populations in RNA extracts of environmental samples was evaluated by designing PNA MB probes for the genera Dechloromonas and Dechlorosoma. In a kinetic study with 16S rRNA from pure cultures, the hybridization of PNA MB to target 16S rRNA exhibited a higher final hybridization signal and a lower apparent rate constant than the hybridizations to nontarget 16S rRNAs. A concentration of 10 mM NaCl in the hybridization buffer was found to be optimal for maximizing the difference between …
Integrating Surface And Sub Surface Flow Models Of Different Spatial And Temporal Scales Using Potential Coupling Interfaces, Alphonce Chenjerayi Guzha
Integrating Surface And Sub Surface Flow Models Of Different Spatial And Temporal Scales Using Potential Coupling Interfaces, Alphonce Chenjerayi Guzha
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The main objective of this research was to develop and utilize a coupled surface water groundwater model to simulate hydrological responses of watersheds. This was achieved by coupling the U.S. Geological Survey (USGS) groundwater flow model, MODFLOW, and the rainfall runoff model, TOPMODEL, in one case study and coupling MODFLOW with a networked version of TOPMODEL called TOPNET in another case study. The model coupling was achieved using the InCouple approach, which utilizes Potential Coupling Interfaces (PCIs) that are abstractions from model flow diagrams that expose only those aspects of a model relevant to coupling. Coupling the rainfall-runoff models to …
The Effect Of Climate Change On The Hydrology Of A Mountainous Catchment In The Western United States: A Case Study At Reynolds Creek, Idaho, Anurag Nayak
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This research is focused on understanding the sensitivity of a hydrologic regime at the Reynolds Creek Experimental Watershed (RCEW), a snowmelt dominated semi-arid mountain basin located in southwest Idaho, to climate warming.
Climate data, collected during 1962 to 2006 at many locations in the RCEW, was carefully checked, preprocessed, and corrected for errors and noise signals introduced by the instrument malfunctioning and extreme weather conditions. An Automated Precipitation Correction Program (APCP) was developed to remove mechanical errors from the weighing-recording bucket type precipitation gauge measurements. APCP produces comparable results to the manual techniques but a degree faster (few minutes against …
Development Of A Mathematical Model For 3d Reconstruction Of Target Objects By Photogrammetry, Keith F. Blonquist
Development Of A Mathematical Model For 3d Reconstruction Of Target Objects By Photogrammetry, Keith F. Blonquist
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This thesis outlines the development of a mathematical model which can be used to perform 3D reconstruction of a target object from surveillance images. 3D reconstruction is a common procedure in photogrammetry, but performing 3D reconstruction from surveillance images can be more difficult than typical photogrammetry applications.
Surveillance images are generally captured in an unsystematic manner because there is no control over the target that is being photographed. Surveillance images can have a wide variety of fields of view, are often captured with uncalibrated cameras, and typically the targets are objects for which there is no other a priori information. …
Generalized Event Tree Algorithm And Software For Dam Safety Risk Analysis, Anurag Srivastava
Generalized Event Tree Algorithm And Software For Dam Safety Risk Analysis, Anurag Srivastava
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Event tree analysis is a most commonly used method in dam safety risk analysis modeling. Available software tools for performing event tree analyses lack the flexibility to efficiently address many important factors in dam safety risk analysis. As a result of these practical limitations, spreadsheets have been used, sometimes including Visual Basic macros, to perform these analyses. However, this approach lacks generality and can require significant effort to apply to a specific dam or to modify the event tree structure. In response to these limitations, here a generalized event tree analysis tool, DAMRAE (DAM safety Risk Analysis Engine), has been …
The Influence Of Debris Cages On Critical Submergence Of Vertical Intakes In Reservoirs, Skyler D. Allen
The Influence Of Debris Cages On Critical Submergence Of Vertical Intakes In Reservoirs, Skyler D. Allen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This study quantifies the influence of debris cages on critical submergence at vertical intakes in reservoir configurations. Four model debris cages were constructed of light panel material. A vertical intake protruding one pipe diameter above the floor of a model reservoir was tested in six configurations: open intake pipe, a debris grate placed directly over the intake pipe, and debris cages representing widths of 1.5*d and 2*d and heights of 1.5*c and 2*c, where d is diameter of the intake and c is height of intake above reservoir floor. A selection of top grating configurations and a submerged raft configuration …
Application Of Structural Control For Civil Engineering Structures, Abdollah Shafieezadeh
Application Of Structural Control For Civil Engineering Structures, Abdollah Shafieezadeh
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This study presents the application of control methods in seismic mitigation of structural responses. The study consists of two parts. In the first section, fractional order filters are utilized to enhance the performance of the conventional LQR method for optimal robust control of a simple civil structure. The introduced filters modify the state variables fed back to the constant gain controller. Four combinations of fractional order filter and LQR are considered and optimized based on a new performance criterion defined in the paper. Introducing fractional order filters is shown to improve the results considerably for both the artificially generated ground …
Analysis Of Effectiveness Of Bridges With Partial Isolation, Wenying Hu
Analysis Of Effectiveness Of Bridges With Partial Isolation, Wenying Hu
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A special class of seismically isolated bridges shares a common feature in that both ends of the superstructure are restrained and isolators over the columns of bridge uncouple the superstructure from the ground motions. They are defined as partial isolation bridges. From measured acceleration responses, effectiveness of full seismic isolation had been confirmed widely. However, the seismic isolation behavior in the partial isolation has not been widely observed.
The effectiveness of partial isolation is evaluated in this study. The static design procedures for linear and nonlinear partially isolated bridges are developed. Results from the static analysis of linear and nonlinear …
P-M Characteristics Of Reinforced Concrete Sections, Paul Johnson
P-M Characteristics Of Reinforced Concrete Sections, Paul Johnson
All Theses
This manuscript presents two parametric studies which were performed to evaluate a provision which originated in the 1994 Uniform Building Code (UBC). This provision states that if gravity-induced axial loads carried by a reinforced concrete member are greater than 35% of the pure axial load-carrying capacity (Po) of that member, then the member cannot be used as part of the lateral force resisting system (LRFS). Along with the UBC provision, the Structural Engineers Association of California's (SEAOC) Blue Book states that the value of 0.35Po corresponds to the level of axial load representing a balanced state of strain, i.e., the …
Optimal Maintenance Crew Composition And Enhancement Of Crew Productivity, Robert Schober
Optimal Maintenance Crew Composition And Enhancement Of Crew Productivity, Robert Schober
All Theses
The South Carolina Department of Transportation (SCDOT) dedicates a large portion of its budget and other resources to the maintenance of the State's transportation infrastructure. In order to maximize the efficiency and productivity of the State's highway maintenance workforce, the SCDOT partnered with Clemson University to research the performance of these maintenance crews. The goal of this research is to identify optimal crew compositions, if possible, and to suggest potential crew productivity enhancement methods.
Data was collected from the SCDOT Highway Maintenance Management System (HMMS) and crew rankings were developed based on several pre-determined performance criteria. These rankings were then …
Analysis Of Speed-Related Crashes Using Event Data Recorder Data, Swathi Korpu
Analysis Of Speed-Related Crashes Using Event Data Recorder Data, Swathi Korpu
All Theses
Safety in general is defined as 'the absence of unintended harm to living creatures or inanimate objects' (Evans, 2004). Traffic safety is measured in terms of motor vehicle crashes. A crash is an unplanned event which results in either fatality, or injury or property damage. Of all the factors that contribute to a crash, speed is a major issue, as more than 31 percent of all fatal crashes involve speeding (NHTSA, 2007). The speed-safety relationship can be determined by knowing the effect of speed on the frequency and severity of crashes. The relationship between speed and frequency of crashes is …
Simulating Truck Lane Management Approaches To Improve Efficiency And Safety Of Highways In Knoxville, Tennessee, Adebola Adebisi Adelakum
Simulating Truck Lane Management Approaches To Improve Efficiency And Safety Of Highways In Knoxville, Tennessee, Adebola Adebisi Adelakum
Masters Theses
Increased globalization has caused large increases in truck traffic on the nation’s interstate system, with much additional growth expected in the coming years. This growth has elevated interest in developing new strategies to address rising levels of truck traffic, especially in dense and congested urban areas. This thesis focuses on the evaluation of several alternative lane management configurations as they compare to the current lane configuration in search of the best fit for operational improvement. This task was performed in two ways – survey and simulation. A survey of 500 long-haul truck drivers was administered in Knoxville, Tennessee, at the …
Investigation Of The Effective Use Of Warning Lights On Indiana Department Of Transportation (Indot) Vehicles And Equipment, Bob Mccullouch, Brandon Stevens
Investigation Of The Effective Use Of Warning Lights On Indiana Department Of Transportation (Indot) Vehicles And Equipment, Bob Mccullouch, Brandon Stevens
JTRP Technical Reports
This study was requested by INDOT to determine if current lighting packages used on INDOT maintenance vehicles, specifically snow plow vehicles, can be improved with other commercially available products. Different light products were obtained from various vendors, mounted on INDOT vehicles, and visual comparisons were performed under various lighting and weather conditions by a team of observers. The comparison evaluations were performed revealing that other light packages, LED models for most options, were brighter and certain colors more visible. The preferred light models are recommended. These recommendations were forwarded to appropriate individuals that make these decisions at INDOT. Implementation is …
Trade-Off Analysis Methodology For Asset Management, Qiang Bai, Samuel Labi, Zongzhi Li
Trade-Off Analysis Methodology For Asset Management, Qiang Bai, Samuel Labi, Zongzhi Li
JTRP Technical Reports
In an era that is characterized by funding limitations, increased stakeholder participation, and the need for increased accountability and transparency, transportation agencies seek to ensure that comprehensive evaluation processes are identified and used for decision-making. Consistent with such processes is the incorporation of multiple performance criteria from different program areas, optimization of decisions under constrained budgets, and investigation of trade-offs between program areas, performance measures, budgetary levels, risk levels, and performance thresholds. To help INDOT carry out these processes, this study developed theoretical constructs for scaling and amalgamation of the different performance measures, and for analyzing the different kinds of …
High-Performance Concrete Bridge Decks: A Fast-Track Implementation Study, Volume 1: Structural Behavior, Robert J. Frosch, Timothy S. Aldridge
High-Performance Concrete Bridge Decks: A Fast-Track Implementation Study, Volume 1: Structural Behavior, Robert J. Frosch, Timothy S. Aldridge
JTRP Technical Reports
Transverse cracking of concrete bridge decks is problematic in numerous states. Cracking has been identified in the negative and positive moment regions of bridges and can appear shortly after opening the structure to live loads. To improve the service life of the bridge deck as well as decrease maintenance costs, changes to current construction practices in Indiana are being considered. A typical bridge deck was instrumented which incorporated the following: increased reinforcement amounts, decreasing reinforcement spacing, and high-performance, low-shrinkage concrete. The low shrinkage concrete was achieved using a ternary concrete mix. The objective of this research was to determine the …
Alternative Land Use Patterns To Minimize Congestion (Volume 3: Empirical Study Of Mixed Land Use Traditional Neighborhoods), Li Jin, Jon D. Fricker
Alternative Land Use Patterns To Minimize Congestion (Volume 3: Empirical Study Of Mixed Land Use Traditional Neighborhoods), Li Jin, Jon D. Fricker
JTRP Technical Reports
Urban sprawl creates serious traffic congestion. Alternative land use patterns may be the best solution. New Urbanists claim that, by placing frequently-visited sites within walking distance of homes and creating a pleasant walking environment, people are more willing to choose non-motorized transportation mode to do such activities.
Part I of this study investigated the ability of travel demand models to estimate the impacts of alternative land use patterns. Part II conducted an economic viability analysis for a mixed land use neighborhood and collected land use preferences at meetings of neighborhood associations. The objective in Part III was to evaluate the …
Safety And Operational Impacts Of Alternative Intersections, Andrew P. Tarko, Mike Inerowicz, Brandon Lang
Safety And Operational Impacts Of Alternative Intersections, Andrew P. Tarko, Mike Inerowicz, Brandon Lang
JTRP Technical Reports
As the degradation of service at some conventional intersections increases, there becomes a need for alternative solutions other than expensive interchanges. Many alternative intersections have been proposed in the past. Under certain traffic and local conditions some solutions are more promising than other. In some cases, the conventional intersection may still be the optimal choice. The presented research focused on developing guidelines that would help planners and designers identify the most promising solutions for further analysis. This objective has been addresses in two ways. Firstly, the existing knowledge on alternative intersections has been identified. Secondly, the performance of conventional and …
Alternative Land Use Patterns To Minimize Congestion (Volume 2: Evaluating The Feasibility Of New Urbanism In An Existing Neighborhood), Huei Koh, Jon D. Fricker
Alternative Land Use Patterns To Minimize Congestion (Volume 2: Evaluating The Feasibility Of New Urbanism In An Existing Neighborhood), Huei Koh, Jon D. Fricker
JTRP Technical Reports
Urban sprawl creates serious traffic congestion. Alternative land use patterns may be the best solution. New Urbanists claim that, by placing frequently-visited sites within walking distance of homes and creating a pleasant walking environment, people are more willing to choose non-motorized transportation mode to do such activities.
Part I of this study investigated the ability of travel demand models to estimate the impacts of alternative land use patterns. Part II conducted an economic viability analysis for a mixed land use neighborhood and collected land use preferences at meetings of neighborhood associations. The objective in Part III was to evaluate the …
Alternative Land Use Patterns To Minimize Congestion (Volume 1: Comparative Analysis Of Mixed Land Use And Separated Land Use Neighborhoods), Amica Bose, Jon D. Fricker
Alternative Land Use Patterns To Minimize Congestion (Volume 1: Comparative Analysis Of Mixed Land Use And Separated Land Use Neighborhoods), Amica Bose, Jon D. Fricker
JTRP Technical Reports
Urban sprawl creates serious traffic congestion. Alternative land use patterns may be the best solution. New Urbanists claim that, by placing frequently-visited sites within walking distance of homes and creating a pleasant walking environment, people are more willing to choose non-motorized transportation mode to do such activities.
Part I of this study investigated the ability of travel demand models to estimate the impacts of alternative land use patterns. Part II conducted an economic viability analysis for a mixed land use neighborhood and collected land use preferences at meetings of neighborhood associations. The objective in Part III was to evaluate the …
Use Of Micropiles For Foundations Of Transportation Structures Final Report, Hoyoung Seo, Monica Prezzi
Use Of Micropiles For Foundations Of Transportation Structures Final Report, Hoyoung Seo, Monica Prezzi
JTRP Technical Reports
In pile design, piles must be able to sustain axial loads from the superstructure without bearing capacity failure or structural damage. In addition, piles must not settle or deflect excessively in order for the serviceability of the superstructures to be maintained. In general, settlement controls the design of piles in most cases because, by the time a pile has failed in terms of bearing capacity, it is very likely that serviceability will have already been compromised. Therefore, realistic estimation of settlement for a given load is very important in design of axially loaded piles. This notwithstanding, pile design has relied …
Methods Of Safety Improvements At Coordinated Signals, Wei Li, Andrew P. Tarko
Methods Of Safety Improvements At Coordinated Signals, Wei Li, Andrew P. Tarko
JTRP Technical Reports
In this research, the safety impact of arterial signal coordination is investigated. Based on the findings, procedures are proposed to incorporate safety considerations into signal coordination design. In addition, a software tool is developed to facilitate the use of the research findings. Signal coordination has been extensively employed as a tool to optimize an arterial system’s mobility performance, commonly measured by the total number of vehicle stops and the time of delays. Although vehicle crashes at signalized intersections have long been recognized as a major safety threat, studies to date have been limited locally to non-coordinated signals or the noncoordinated …
Evaluación De La Gestión De Aguas Subterráneas En Colombia, Rafael Alejandro Buitrago Rodriguez, Javier Armando Rojas Felix
Evaluación De La Gestión De Aguas Subterráneas En Colombia, Rafael Alejandro Buitrago Rodriguez, Javier Armando Rojas Felix
Ingeniería Civil
No abstract provided.
Dynamic Responses Of Marine Risers/Pipes Transporting Fluid Subject To Top End Excitations, J. Leklong, S. Chucheepsakul, S. Kaewunruen
Dynamic Responses Of Marine Risers/Pipes Transporting Fluid Subject To Top End Excitations, J. Leklong, S. Chucheepsakul, S. Kaewunruen
Faculty of Engineering - Papers (Archive)
This paper deals with the dynamic responses to top end excitation of marine risers/pipes conveying internal fluid. The marine riser is often used as a flexible link between undersea bore head and subsurface offshore platform. The tidal waves and the changes of sea level consistently excite its top end connected to a floating vessel. In order to carry out the performance-based design of the marine risers, the evaluation of their dynamic responses to top end excitations is imperative. In this study, the marine riser is simulated using twodimensional beam elements. Energy functional of the marine risers conveying fluids is derived …
Influence Of Joint Stiffness On The Free Vibrations Of A Marine Riser Conveying Fluid, S. Kaewunruen, T. Mccarthy, J. Leklong, S. Chucheepsakul
Influence Of Joint Stiffness On The Free Vibrations Of A Marine Riser Conveying Fluid, S. Kaewunruen, T. Mccarthy, J. Leklong, S. Chucheepsakul
Faculty of Engineering - Papers (Archive)
The marine risers are generally used as the main transport means for economic materials and resources discovered undersea. In general, the marine risers are secured at either an offshore platform or a vessel. Both ends of the riser are to be adjusted to obey with the design criteria but in many cases their rotational stiffness is hardly set free for the hinge connection. This paper integrates the analytical investigation and the design consideration for the effects of end supports on the free vibrations of a marine riser conveying fluid. It is well known that resonances of marine risers/pipes can cause …