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Articles 811 - 840 of 890
Full-Text Articles in Engineering
Methodology For Load Rating Double-Tee Girder Bridges, Sandip Rimal
Methodology For Load Rating Double-Tee Girder Bridges, Sandip Rimal
Electronic Theses and Dissertations
The most common type of bridge on South Dakota (SD) local roads is precast prestressed double-tee (DT) girders. More than 700 DT bridges are currently in-service in SD. Structural detailing, aging, traffic volume, and environmental conditions affect the structural performance, integrity, and capacity of DT bridges. When a bridge is affected by one or more of the aforementioned parameters, the estimation of the bridge safe live loads is necessary to ensure the safety of the traveling public and to prevent excessive bridge damage and collapse. Load rating of damaged bridges is challenging mainly because of a lack of information regarding …
Advanced Technologies For Efficient Transportation Construction Inspection, Clyde Wesley Newcomer Iv
Advanced Technologies For Efficient Transportation Construction Inspection, Clyde Wesley Newcomer Iv
Theses and Dissertations--Civil Engineering
Collecting load tickets is an example of an antiquated practice that puts inspectors in harm’s way either adjacent to traffic, in close proximity to moving or backing equipment, or at times requires climbing onto trucks to reach tickets. Technology exists to collect this information electronically allowing for safer, efficient inspection methods. Departments of Transportation are charged with inspecting an increasing work load with a diminishing number of inspection staff. Recently, doing more with less has led to the prioritization of inspection activities and resulted in less collection of data and visual inspection on projects. Technology advancements are available to improve …
Risk Management And Practice Alignment For Utility Coordination On Transportation Projects, Roy E. Sturgill Jr.
Risk Management And Practice Alignment For Utility Coordination On Transportation Projects, Roy E. Sturgill Jr.
Theses and Dissertations--Civil Engineering
Utility coordination is an exceedingly complex effort of managing, communicating, and facilitating the avoidance and relocation of utility facilities as needed for highway projects. Utility coordination occurs throughout the design and delivery of a project and best practices are used to make sure this occurs efficiently and in the best interest of the public, who are not only the taxpayers but also the ratepayers. Recent research has attempted to enhance utility location technology and procedures, instill frameworks and tools for utility coordination, and proceduralize risk management relative to utility coordination. However, research attempting to improve various aspects of utility coordination …
Direct Measurement Of Crosstie-Ballast Interface Pressures Using Granular Material Pressure Cells, Travis James Watts
Direct Measurement Of Crosstie-Ballast Interface Pressures Using Granular Material Pressure Cells, Travis James Watts
Theses and Dissertations--Civil Engineering
The magnitudes and relative pressure distributions transmitted to the crosstie-ballast interface of railroad track significantly influences the subsequent behavior and performance of the overall track structure. If the track structure is not properly designed to distribute the heavy-axle loads of freight cars and locomotives, deficiencies and inherent failures of the crossties, ballast, or underlying support layers can occur, requiring substantial and frequent maintenance activities to achieve requisite track geometrical standards. Incorporating an understanding of the pressure distribution at the crosstie-ballast interface, appropriate designs can be applied to adequately provide a high performing and long-lasting railroad track. Although this can be …
A Framework For Assessing Water Quality, Prioritizing Recovery Potential, And Analyzing Placement Of Best Management Practices, Tadesse Animaw Sinshaw
A Framework For Assessing Water Quality, Prioritizing Recovery Potential, And Analyzing Placement Of Best Management Practices, Tadesse Animaw Sinshaw
Electronic Theses and Dissertations
Motivated by the U.S. EPA goals, this research developed a framework to support identification and restoration of nutrient-impaired water bodies. The study objectives were developing total nitrogen (TN) and total phosphorus (TP) prediction models, evaluating the impact of social indicators on assessing recovery potential, and developing a spatial decision support system for choice and placement of best management practices (BMPS). An artificial neural network was used to develop TN and TP predictive regional models for U.S. lakes using easily measurable and cost-effective variables. The performance of models was superior for regions trained with larger datasets and/or regions with lower temperature …
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 …
Análisis De La Influencia De La Variación De La Lámina De Agua Sobre Un Medio Poroso Utilizando Slide Rocscience En El Km 21+900 Vía Pacho Talauta, Braham Stuart Hernandez González, Julian Leonardo Najar Guzman
Análisis De La Influencia De La Variación De La Lámina De Agua Sobre Un Medio Poroso Utilizando Slide Rocscience En El Km 21+900 Vía Pacho Talauta, Braham Stuart Hernandez González, Julian Leonardo Najar Guzman
Ingeniería Civil
No abstract provided.
Carencias En La Etapa De Planeación De Carreteras En Colombia A Partir De La Evidencia De Sus Impactos Socioambientales Análisis De Casos, Fabian Esteban Cepeda Arias, Pedro Antonio Farieta Martínez
Carencias En La Etapa De Planeación De Carreteras En Colombia A Partir De La Evidencia De Sus Impactos Socioambientales Análisis De Casos, Fabian Esteban Cepeda Arias, Pedro Antonio Farieta Martínez
Ingeniería Civil
No abstract provided.
Participación En La Ejecución Del Proyecto De Extensión Denominado Acuerdo Específico De Cooperación N° 001 De 2018 Celebrado Entre La Universidad De La Salle Bogotá Y Cherry Holding Sas, Yesid Alexander Perez Avella
Participación En La Ejecución Del Proyecto De Extensión Denominado Acuerdo Específico De Cooperación N° 001 De 2018 Celebrado Entre La Universidad De La Salle Bogotá Y Cherry Holding Sas, Yesid Alexander Perez Avella
Ingeniería Civil
En el departamento de la Guajira cuenta con un gran potencial de generación de energía eólica, el cual ha sido de gran atractivo para multinacionales como Enel Green Power. Por esta razón se han adelantado mediciones de viento para verificar la viabilidad de este tipo de proyectos en la región. Dichas mediciones se realizan en territorios pertenecientes a comunidades wayuu, por lo que la multinacional Enel Green Power, a través de Cherry Holding SAS, brinda obras de compensación a cada uno de los resguardos indígenas en donde se realizaron las mediciones eólicas, en contraprestación por el uso del suelo. Luego …
Diseño Preliminar De Una Conexión Con Solicitación A Momento De Acero Estructural, Héctor Fabián López Bermúdez
Diseño Preliminar De Una Conexión Con Solicitación A Momento De Acero Estructural, Héctor Fabián López Bermúdez
Ingeniería Civil
No abstract provided.
Proposal Of A Model That Allows To Improve The Behavior Of The Passenger Flow Inside The Transmilenio Stations, David Robles Forero
Proposal Of A Model That Allows To Improve The Behavior Of The Passenger Flow Inside The Transmilenio Stations, David Robles Forero
Ingeniería Civil
No abstract provided.
Presupuesto Técnico De Las Alternativas De Solución Planteadas Para El Sistema De Cimentación De Torres Eléctricas Ubicadas Sobre El Río Guaviare En El Corregimiento De Amanaven – Vichada, Yurley Medina Jaimes
Presupuesto Técnico De Las Alternativas De Solución Planteadas Para El Sistema De Cimentación De Torres Eléctricas Ubicadas Sobre El Río Guaviare En El Corregimiento De Amanaven – Vichada, Yurley Medina Jaimes
Ingeniería Civil
Dentro del proyecto de investigación “DIAGNOSTICO DEL ESTADO ACTUAL DE LA INFRAESTRUCTURA QUE FUE CONSTRUIDA CON OCASIÓN DE LA EJECUCIÓN DE LOS CONTRATOS INTERADMINISTRATIVOS 061-2011 Y 045-2012”, se requiere presentar el presupuesto técnico de las tres alternativas que den solución a las patologías presentadas. Para esto inicialmente se digitalizará la geología de la zona, posteriormente se procesarán los ensayos de laboratorio contratados con un laboratorio externo, de manera que se pueda obtener el perfil geotécnico representativo. Basados en el diseño de las alternativas de solución se desarrollará el presupuesto de cada una de las alternativas, lo cual incluye costos directos, …
Análisis Comparativo De La Disipación De Energía Y Patrones De Flujo Generados Por Vertederos Escalonados En Gavión Y Vertederos De Caída Libre En Concreto En El Río Fucha, En La Localidad San Cristóbal, Eliana Stefania Plazas Romero, Juan Sebastian Acuña Plazas
Análisis Comparativo De La Disipación De Energía Y Patrones De Flujo Generados Por Vertederos Escalonados En Gavión Y Vertederos De Caída Libre En Concreto En El Río Fucha, En La Localidad San Cristóbal, Eliana Stefania Plazas Romero, Juan Sebastian Acuña Plazas
Ingeniería Civil
No abstract provided.
Diseño De Las Alternativas De Solución Para El Sistema De Cimentación De Torres Eléctricas Ubicadas Sobre El Rio Guaviare En El Corregimiento De Amanaven Vichada, Oscar Julian Moreno Romero
Diseño De Las Alternativas De Solución Para El Sistema De Cimentación De Torres Eléctricas Ubicadas Sobre El Rio Guaviare En El Corregimiento De Amanaven Vichada, Oscar Julian Moreno Romero
Ingeniería Civil
Dentro del proyecto de investigación “DIAGNOSTICO DEL ESTADO ACTUAL DE LAINFRAESTRUCTURA QUE FUE CONSTRUIDA CON OCASIÓN DE LA EJECUCIÓN DE LOS CONTRATOS INTERADMINISTRATIVOS 061-2011 Y 045-2012”, se realizará el diseño de tres alternativas de solución para el sistema de cimentación el cual presenta patologías como se observó en la documentación revisada y la visita técnica a campo llevada a cabo por el grupo de investigación ; Dicho sistema está compuesto por tres cimentaciones, dos de ellas ubicadas en depósito arcilloso y la otra en depósito arenoso, todas tienen la misma geometría y están al mismo nivel de cimentación. Inicialmente, se …
Mitigación De Procesos De Socavación En Cuerpos Fluviales Estudio De Caso Río Guaviare Corregimiento Amanaven Vichada Diseño De Alternativas De Mitigación, Carlos Alberto Ávila Torres
Mitigación De Procesos De Socavación En Cuerpos Fluviales Estudio De Caso Río Guaviare Corregimiento Amanaven Vichada Diseño De Alternativas De Mitigación, Carlos Alberto Ávila Torres
Ingeniería Civil
No abstract provided.
Apoyo En Las Actividades De Investigación Del Proyecto Aplicación De La Visión Artificial Para La Caracterización De Materiales De Ingeniería Civil Y/O Procesos Industriales, Anyi Lizeth Hernandez Niño
Apoyo En Las Actividades De Investigación Del Proyecto Aplicación De La Visión Artificial Para La Caracterización De Materiales De Ingeniería Civil Y/O Procesos Industriales, Anyi Lizeth Hernandez Niño
Ingeniería Civil
No abstract provided.
Behavior And Temporal-Based Effects Of Sustainable Self-Consolidating Concrete In Bridge Structures, Hayder Hussein Alghazali
Behavior And Temporal-Based Effects Of Sustainable Self-Consolidating Concrete In Bridge Structures, Hayder Hussein Alghazali
Doctoral Dissertations
"The main objective of this study was to investigate the performance of sustainable self-consolidating concrete (SCC) for highway bridge structures. Two types of concrete were utilized in this study: high volume fly ash-self consolidating concrete (HVFA-SCC) and high strength-self consolidating concrete (HS-SCC). This dissertation consists of two major parts: a laboratory study developing and investigating the overall performance of HVFA-SCC and a field study of time-dependent field-based behavior of HS-SCC in Bridge A7957 MO, USA. In the first part, an experimental program was conducted to develop a new class of SCC incorporating up to 70% cement replacement with fly ash. …
Strengthening Of Reinforced Masonry Walls Subjected To Out-Of-Plane Pseudo-Static Cyclic Load Using Advanced Composite, Zuhair Al-Jaberi
Strengthening Of Reinforced Masonry Walls Subjected To Out-Of-Plane Pseudo-Static Cyclic Load Using Advanced Composite, Zuhair Al-Jaberi
Doctoral Dissertations
"A number of researchers have conducted experimental tests on unreinforced masonry walls (URM) strengthened with advanced composite materials. Consequently, the strengthening design guidelines are limited in their scope to URM. This research aimed to investigate the behavior of reinforced masonry walls strengthened with advanced composite and subjected to out-of-plane pseudo-static cyclic load. Experimental and analytical studies were conducted to evaluate the performance of different techniques such as near surface mounted (NSM) and externally bonded (EB) fiber reinforced polymer (FRP) with epoxy resin, in addition to NSM with cementitious adhesive and fiber reinforced cementitious material (FRCM). The experimental part included three …
Service Response And Evaluation Of Prestressed Concrete Bridges Through Load Testing, Eli Saul Hernandez Ramos
Service Response And Evaluation Of Prestressed Concrete Bridges Through Load Testing, Eli Saul Hernandez Ramos
Doctoral Dissertations
"During the last two decades, self-consolidating concrete (SCC) has emerged as an alternative to produce structures with longer life expectancy. Despite the advantages that come with using SCC, there are some concerns related to its structural and serviceability response. The effect of the larger paste content and smaller coarse aggregate size is of particular interest because this combination may inhibit the development of the SCC's target mechanical properties. Field tests are an effective method to monitor the service response of infrastructure. In addition, field tests have largely confirmed reserves of strength capacity in existing bridges despite their visual condition and …
Guayule Plant Extracts As Binder Modifiers In Flexible (Asphalt) Pavement Mixtures, Steven Michael Lusher
Guayule Plant Extracts As Binder Modifiers In Flexible (Asphalt) Pavement Mixtures, Steven Michael Lusher
Doctoral Dissertations
"The guayule (pronounced, 'why-YOO-lee') plant is a woody perennial shrub that is native to areas of the southwestern United States and northern Mexico, and is a well-documented source of high-quality natural rubber. The U.S. needs a domestic source of natural rubber to allay concerns about its future availability. Cultivation of guayule in North America has been attempted many times since the late 19th century, and companies, including major tire manufacturers, are again investing in guayule research. However, full-scale commercialization of guayule rubber needs established markets for the two basic by-products of guayule rubber extraction: the plant resins (primarily non-rubber compounds) …
Multi-Scale Investigation Of Microstructure, Fiber-Matrix Bond, And Mechanical Properties Of Ultra-High Performance Concrete, Zemei Wu
Doctoral Dissertations
"The main objective of this study is to provide new insights into enhancing fiber-matrix bond and mechanical properties of ultra-high performance concrete (UHPC). Three main strategies were investigated: 1) use of supplementary cementitious materials; 2) use of nano-particles; and 3) use of deformed fibers. A multi-scale investigation involving the evaluation of non-fibrous UHPC mortar phase (matrix), fiber-matrix interface phase, and then UHPC composite material was undertaken to determine microstructural characteristics, fiber bond to matrix, and key mechanical properties of the UHPC matrix and UHPC. Test results indicate that the incorporation of 10%-20% silica fume effectively improved the fiber-matrix bond and …
Sensitivity Of Rheological Properties Of Cement Paste With Scc Consistency, Azadehalsadat A. Asghari
Sensitivity Of Rheological Properties Of Cement Paste With Scc Consistency, Azadehalsadat A. Asghari
Doctoral Dissertations
"Robustness, which is defined as the capacity of a mixture to tolerate small variations in constituent elements, mixing parameters or temperature that are inevitable with production at any significant scale, is a key property to expand the practical implementation of self-consolidating concrete (SCC). At the first step, the effect of different amount of water, amount of superplastizer, mixing time, mixing speed and the addition time of superplastizer on the rheological properties of cement pastes with SCC consistency, has been evaluated. Two different SCC mix design concepts, the powder-type and VMA-type were selected for this research. The results show that the …
Bio-Inspired Geomaterial Improvement And Development Of Innovative Characterization Methods, Junnan Cao
Bio-Inspired Geomaterial Improvement And Development Of Innovative Characterization Methods, Junnan Cao
Doctoral Dissertations
"This study experimentally investigated the bio-inspired improvement on geomaterials, including enzyme induced calcite precipitation (EICP) and biopolymers. This study also developed several innovative characterization tools to advance the state-of-the-art testing techniques, including SIP-BE column, rotational sedimental panel, and backpressure saturated constant hydraulic gradient break through column. Firstly, EICP test was performed on Ottawa 50-70 sand in a newly developed SIP-BE column. Nondestructive techniques -- spectral induced polarization (SIP) and bender element were used to monitor the precipitation process and shear wave velocities (Vs). SIP, Vs, and SEM results all suggest contact cementation as the preferential precipitation …
Adaptive Data Analysis For Damage Detection And System Identification In Civil Infrastructure, Hongya Qu
Adaptive Data Analysis For Damage Detection And System Identification In Civil Infrastructure, Hongya Qu
Doctoral Dissertations
"Time-varying structural systems are often encountered in civil engineering. As extreme events occur more frequently and severely in recent years, more structures are loaded beyond their elastic conditions and may thus experience damage in the years to come. Even if structures remain elastic, energy dissipation devices installed on structures often reveal hysteretic behaviors under earthquake loads. Therefore, it is imperative to develop and implement novel technologies that enable the identification and damage detection of time-varying systems. In this dissertation, adaptive wavelet transform (AWT) and multiple analytical mode decomposition (M-AMD) are proposed and applied to identify system properties and detect damage …
Critical Buckling And Post-Buckling Behavior Of Thin-Walled Liners Encased By Underground Pipelines In Saturated Soils, Zhaochao Li
Doctoral Dissertations
"This study aims to investigate the structural stability of thin-walled liners encased in functionally-obsolete underground pipelines in saturated soil under external hydrostatic pressure, a concentrated load, temperature change or their combination, and develop a simplified circular arch model of thin-walled liners when not constrained by the pipelines. The friction and adhesion on the interface between a liner and its constraining surface (pipeline or grouting), and the pressure gradient on deeply-buried pipelines are neglected. The critical buckling load of elastic liners is analytically derived under a plane strain condition using the principle of minimum potential energy. The analytical solution is either …
Long-Term Behavior Of Fiber Reinforced Polymer (Frp) Confined Concrete Cylinders Subjected To Severe Weather And Seawater Solution Conditions, Song Wang
Doctoral Dissertations
"This study presents an experimental investigation on durability of fiber-reinforced polymer (FRP) confined concrete cylinders subjected to various environmental conditions. Two types of cylinders were tested in this experiment: concrete-filled FRP tube (CFFT) and hollow-core FRP-concrete-steel (HC-FCS), with FRP tubes having two different constitutive resin components: polyester and epoxy. The specimens were subjected to three different environmental conditions: combined freeze/thaw, wet/dry and heating/cooling cycles with options of continuous water immersion and sustained axial load in an environmental chamber, UV exposure in an UV chamber, and seawater immersion in water tanks with sustained axial load. Mechanical and material characterization tests were …
Quantitative Phase-Field Modeling Of Crack Propagation In Multi-Phase Materials, Arezoo Emdadi
Quantitative Phase-Field Modeling Of Crack Propagation In Multi-Phase Materials, Arezoo Emdadi
Doctoral Dissertations
”Research presented in this dissertation is focused on developing and validating a computational framework for study of crack propagation in polycrystalline composite ceramics capable of designing micro-architectures of phases to improve fracture toughness and damage tolerance of ZrB2-based ultra-high temperature ceramics (UHTCs). A quantitative phase-field model based on the regularized formulation of Griffith’s theory is presented for crack propagation in homogenous and heterogeneous brittle materials. This model utilizes correction parameters in the total free energy functional and mechanical equilibrium equation within the crack diffusive area to ensure that the maximum stress in front of the crack tip is …
Noise Induced Hearing Loss Accountability On Jobsites Within The Construction Industry, Joseph O. Lamphere
Noise Induced Hearing Loss Accountability On Jobsites Within The Construction Industry, Joseph O. Lamphere
Construction Management
Noise induced hearing loss is a major issue on jobsites within the construction industry. Every day workers are exposed to hazardous levels of noise, but they are not being properly managed to mitigate this issue. Workers have misconceptions about the topic, but more surprisingly are sometimes indifferent to the effects; believing hearing loss is inevitable, or it can be cured with a hearing aide. Construction has inherent dangers that workers have to deal with every day. Hearing loss might not be on the top of their lists, but the effects are permanent, and they cannot be cured with a hearing …
Examination Of Shear Friction Design Provisions, Nikkolas J. Edgmond
Examination Of Shear Friction Design Provisions, Nikkolas J. Edgmond
Masters Theses
"This thesis reports the results of research conducted to establish a state-of-the-art database of shear-friction studies to be turned over to ACI Committee 445-0D as a living document, utilize a subset of the established database to examine the effectiveness of the ACI 318 Code (2014), PCI Design Handbook (2010), AASHTO LRFD Bridge Design Specification (2016) and CSA A23.3 Design of Concrete Structures Standard (2014) provisions to predict shear transfer strength, and examine the effective coefficient of friction (µe) approach allowed in the PCI Design Handbook (2010).The shear friction design concept is applicable in conditions where direct shear must …
Sewage Contaminated Lake Water Quality Remediation Through In-Situ Aeration, Dylan Michael Verburg
Sewage Contaminated Lake Water Quality Remediation Through In-Situ Aeration, Dylan Michael Verburg
Electronic Theses and Dissertations
India, and much of South-Asia is currently plagued with an epidemic that threatens one of the most fundamental resources for human survival – clean drinking water. Many of these issues are related to the improper management of sewage. Installation and implementation of conveyance and treatment infrastructure to help manage this waste is often impractical in many circumstances. In an effort to help address this issue, the practicality of implementing aeration technologies within existing drainage infrastructure contaminated with diffuse organic material was evaluated. For this evaluation, Sonia Vihar Lake, a small drainage pond in Delhi, India was found to be suitable …