Engineering Commons^™

Estudio De Las Ventajas Del Reciclado In Situ En Caliente De Pavimentos Flexibles, Juan Carlos Sanchez Angel

Ingeniería Civil

No abstract provided.

Experimental And Theoretical Investigation Of Adsorption Of Water Vapor On Carbon Nanotubes, Pyoungchung Kim

Doctoral Dissertations

The adsorption of water in nanoporous materials becomes an important issue in the environmental fate and applications when one considers the practical use of these materials as adsorbents for hazardous organic compounds in the diverse environments.

In this study, the complexity of water-SWNTs interaction was investigated by morphological and chemical characterization techniques, by gravimetric adsorption measurement and by interpretation of experimental adsorption isotherms by fitting to several existing semi-empirical water adsorption models. Commercially available SWNTs samples were measured for chemical and physical characterization such as O% by x-ray photoelectron spectroscopy, I_D/I_G by Raman spectroscopy and surface and …

Structural Health Monitoring And Damage Evaluation Of Full-Scale Bridges Using Triaxial Geophones: Controlled In-Situ Experiments And Finite Element Modeling, William S. Ragland Ii

Doctoral Dissertations

The purpose of this study was to evaluate the effectiveness of various vibration-based damage detection methods using triaxial vibration records obtained using inexpensive geophones during in-situ, full-scale, damaged bridge tests.

Geophones are passive directional sensors and much cheaper than accelerometers which are typically used for structural vibration measurements. However, magnitude and phase errors associated with a geophone’s output must be corrected for if they are implemented in bridge monitoring systems. This research discusses correction procedures for magnitude and phase errors associated with geophones. A simply supported beam was analyzed to verify that the correction procedures and modal parameter identification procedures …

Development Of Dbt Bridge System With Continuous Joints For Accelerated Construction, Lungui Li

Doctoral Dissertations

Speed of construction has become a critical issue to minimize disruption of traffic and commerce. One of the promising systems for accelerated bridge construction is the use of the decked bulb-tee (DBT) girders for the bridge superstructure. An integral deck that is precast and prestressed with the girder provides benefits of rapid construction along with improved structural performance. However, the limited research and concerns about the use of longitudinal joints as well as intermediate diaphragms limit widespread of the DBT bridge system.

This dissertation presents a study of the continuous for both moment and shear transfer longitudinal joint detail and …

Material Sustainability, Jessica Meadows, Natasha Morris

Architectural Engineering

This paper addresses the sustainability of the materials used to construct buildings today. Timber, concrete and steel are analyzed for carbon output, cost, and recyclable-ability.

Estado Esfuerzo-Deformación De La Estructura De Sostenimiento De Un Túnel A Partir De Un Modelo Físico, Henry Oswaldo Gómez Balceros

Ingeniería Civil

No abstract provided.

Parshall Flume Staff Gauge Location And Entrance Wingwall Discharge Calibration Corrections, Bryan J. Heiner

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Utah Water Research Laboratory, in conjunction with the State of Utah, initiated a study to determine the accuracy of a wide variety of flow measurement devices in Utah. The project selected 70 sites with flow measurement devices throughout the state. During the assessment each device had its physical condition and flow measurement accuracy documented.

Although a wide variety of flow measurement devices were tested, the majority were Parshall flumes. Many of the assessed Parshall flumes were not measuring flow to the specified ±5 percent design accuracy. Problems in flow measurement were due to issues with the staff gauge location …

Identifying And Comparing Key Process Attributes For Sustainable Building Delivery In India And The U.S., Prashanth Palanisamy

All Theses

India is a rapidly developing nation with the associated brisk pace of construction. More sustainable building practices for construction in India would have social, environmental, and economic benefits. However, the key process attributes for successfully planning, designing, and constructing sustainable buildings in India are largely undefined. Other projects in India would benefit from a rigorous identification of these key process attributes which could help leapfrogging the sustainable building delivery in India to the best available practices.
Sustainable buildings require different delivery processes than traditional buildings; this can lead to process wastes due to unfamiliarity or incompatibility of the processes. These …

Comparing Problem-Based Learning And Lecture As Methods To Teach Whole-Systems Design To Engineering Students, Michael Dukes

All Theses

The objective of this research is to compare problem-based learning and lecture as methods to teach whole-systems design to engineering students. A case study, Appendix A, exemplifying successful whole-systems design was developed and written by the author in partnership with the Rocky Mountain Institute. Concepts to be tested were then determined, and a questionnaire was developed to test students' preconceptions. A control group of students was taught using traditional lecture methods, and a sample group of students was taught using problem-based learning methods. After several weeks, the students were given the same questionnaire as prior to the instruction, and the …

Vehicle-Infrastructure Integration (Vii) Enabled Plug-In Hybrid Electric Vehicles (Phevs) For Traffic And Energy Management, Xueying Kang

All Theses

Vehicle Infrastructure Integration (VII) program (also known as IntelliDrive) has proven the potential to improve transportation conditions by enabling the communication between vehicles and infrastructure, which provides a wide range of applications in transportation safety and mobility. Plug-in hybrid electric vehicles (PHEVs) that utilize both electrical and gasoline energy are a commercially viable technology with potential to contribute to both sustainable development and environmental conservation through increased fuel economy and reduced emissions. Considering positive potentials of PHEVs and VII in ITS, a framework that integrates PHEVs with VII technology was created in this research utilizing vehicle-to-vehicle and vehicle-to-infrastructure communications for …

Analysis Of Factors Contributing To Roadside Tree Crashes In South Carolina, Vijay Bendigeri

All Theses

The state of South Carolina has experienced a large number of fatalities and injuries resulting from run off the road tree related crashes. According to 2008 FARS data tree related fixed object fatal crashes in South Carolina (65%) are more than double that of the national (25.8%). Thus, trees are much bigger proportion of all roadside hazards in South Carolina than nationally. In order to achieve a safer roadside which is favorable to the road user, factors contributing to the tree related crashes should be critically analyzed to determine suitable safety improvements.
This research aims at qualitatively and quantitatively assessing …

Evaluation Of An Online Intelligent Transportation System (Its) Asset Management System, Tahera Anjuman

All Theses

Intelligent Transportation System (ITS) enhances the performance of modern transportation systems by improving the reliability of travel times and reducing the risk of collisions and injuries. Recently, many public agencies have expressed a need for an ITS asset management system that will effectively and efficiently meet their requirements of managing associated resources, which often includes technologically sophisticated devices, computer hardware and software, and communications infrastructure. To address this need, the author evaluated different asset management systems for their potential efficacy to support public agencies requirements for an ITS asset management system. These requirements were identified through a nationwide survey of …

Relative Performance Comparison And Loss Estimation Of Seismically Isolated And Fixed-Based Buildings Using Pbee Approach, Prayag J. Sayani

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Current design codes generally use an equivalent linear approach for preliminary design of a seismic isolation system. The equivalent linear approach is based on effective parameters, rather than physical parameters of the system, and may not accurately account for the nonlinearity of the isolation system. The second chapter evaluates an alternative normalized strength characterization against the equivalent linear characterization. Following considerations for evaluation are included: (1) ability to effectively account for variations in ground motion intensity, (2) ability to effectively describe the energy dissipation capacity of the isolation system, and (3) conducive to developing design equations that can be implemented …

Design And Performance Of Load Bearing Shear Walls Made From Composite Rice Straw Blocks, Kevin Robert Camann

Master's Theses

Although rice straw and other grains have been used in building since pre-history, in the past two decades, there has been a move to utilize this rapidly renewable, locally available, agricultural byproduct as part of the sustainable construction movement. Up to this point, this has been done by simply stacking up the full straw bales. Stak Block, invented by Oryzatech, Inc., is a modular, interlocking block made of a composite of rice straw and binding agent that serves as an evolution in straw construction. This study investigates the feasibility of using these Stak Blocks as a structural system. The report …

Impact Of Larger Diameter Strands On Aashto/Pci Bulb-Tees, Jayaprakash Vadivelu

Masters Theses

This thesis consists of the analytical study and the experimental investigation of larger diameter strands in AASHTO Type I girders. The main purpose of this study was to verify that the 2 inch minimum spacing recommended by ACI 318-08 and AASHTO (2008) can be used for 0.7 inch diameter strands by comparing various effects in girders using 0.7 and 0.6 inch diameter strands. Based on the parametric analysis it was concluded that by using 0.7 inch strands there was a considerable saving in the material. For example, an AASHTO BT-72 with 0.6 inch strand could be replaced with AASHTO BT-54 …

Structural Behavior Of A Pile Framed Tie Back Retaining Wall, Mieah Dee Turner

Masters Theses

The objective of this research study is to analyze the preliminary structural behavior of a pile framed tie back retaining wall concept created by the Tennessee Department of Transportation (TDOT). Instrumentation is used to measure the forces and moments on the steel piles, loads on the anchors, and the pressure and displacement of the retained soil over time. Data collection for steel pile analysis consisted of the comparison of strain gage readings. Stress values were calculated from the readings and reduced down to an axial and bending force along the pile. Soil pressures that built up behind the wall were …

Guía De Mantenimiento Para Pavimentos Asfálticos De Vías Locales En Bogotá D.C, Diego Armando Espinosa Rodríguez

Ingeniería Civil

No abstract provided.

Nuevos Procedimientos En La Recuperación De Redes De Alcantarillado, Sergio Eduardo Hernández Niño, Johanna Lisdney López Cárdenas

Ingeniería Civil

No abstract provided.

Construcción De Un Modelo Físico Para El Estudio Experimental De Los Efectos En Superficie Del Avance De Túneles Con Una Tuneladora Tbm-Epb En Suelos Blandos, Diego Armando González Vernaza, Jorge Bercid Lombana Rincón

Ingeniería Civil

No abstract provided.

Pre-Diseño Hidráulico De La Vereda De Santa Lucia Cabrera Cundinamarca, Sara Paola Hernandez Barrera

Ingeniería Civil

No abstract provided.

Sensitivity Analysis And Calibration Of The Alligator Cracking Model In The Mechanistic-Empirical Pavement Design Guide Using Regional Data, Vivek Jha

Theses and Dissertations

The models used in the mechanistic-empirical pavement design guide (M-EPDG) were calibrated using the data from all across the United States. The alligator cracking model uses traffic, material and structural data along with local and global calibration factors to calculate the number of axles to failure and the damage index. Both of which are further used to calculate the fatigue cracking in the pavement with the help of regression coefficients and calibration constants. However, as these coefficients and constants were developed using the national database, the model might not predict the fatigue behavior of the pavement accurately for a particular …

Procedimientos Y Diseños De Modelos Físicos Del Laboratorio De Geolab Del Grupo De Investigación Ciroc, Oscar Mauricio Vargas López, Oscar Javier Parra Cruz

Ingeniería Civil

No abstract provided.

Application Of Driver Behavior And Comprehension To Dilemma Zone Definition And Evaluation, David S. Hurwitz

Open Access Dissertations

Among the most critical elements at signalized intersections are the design of vehicle detection equipment and the timing of change and clearance intervals. Improperly timed clearance intervals or improperly placed detection equipment can potentially place drivers in a Type I dilemma zone, where approaching motorists can neither proceed through the intersection before opposing traffic is released nor safely stop in advance of the stop bar. Type II dilemma zones are not necessarily tied to failures in design, but are more readily tied to difficulties in driver decision making associated with comprehension and behavior. The Type II dilemma zone issues become …

Investigation Of The Geotechnical Properties Of Municipal Solid Waste As A Function Of Placement Conditions, Wilson W. Wong

Master's Theses

An investigation of the variability of engineering properties of municipal solid waste as a function of placement conditions was conducted. Limited data have been reported for the engineering properties of municipal solid waste (MSW) as a function of placement conditions. Wastes have high variability of engineering properties due to heterogeneity in composition and component size; influence from time based effects; and presence of compressible solids. Control of moisture content of MSW at the time of waste placement provides opportunity for increased capacity at a given landfill site due to higher compacted unit weight as well as for control of other …

Estudio Comparativo Del Salto Hidráulico En Canales De Sección Trapezoidal Y Rectangular, Mónica Liliana Díaz Camargo, Melissa Clara Lizcano Araújo

Ingeniería Civil

No abstract provided.

Impacto Socioeconómico Generado Por La Obra Civil De Transmilenio En El Sector Comprendido Desde La Calle 72 Hasta La Calle 127 Sobre La Autopista Norte, Durley Paola Rodríguez García

Ingeniería Civil

No abstract provided.

Impacto Social A Través Del Servicio Nacional De Aprendizaje Sena Regional Putumayo Unidad De Emprendimiento Y Fondo Emprender Con El Programa Tecnológico De Construcción, Jesus Edinson Carreño Tez

Ingeniería Civil

No abstract provided.

Impacto Socioeconómico De La Obra Transmilenio, Troncal Caracas, Tramo Comprendido Desde La Calle 26 Hasta La Calle 72, Carlos Augusto Ipus Gaviria, Juan Pablo Romano

Ingeniería Civil

No abstract provided.

Impacto Socioeconómico Generado Por El Proyecto De La Obra Civil De Transmilenio Sobre La Troncal De La Avenida Caracas Comprendida Entre La Calle 1 Y La Calle 45 Sur, Ferley Antonio Diaz Barrios, Carlos Emiro Rojas López

Ingeniería Civil

No abstract provided.

Impacto Socioeconómico Generado Por La Obra Civil De Transmilenio En El Tramo Vial Comprendido Entre La Calle 8ª Sur Y El Portal Sur, Sobre La Troncal Nqs, Heidy Trinidad Henao Culma, Ricardo Andrés Ávila Díaz

Ingeniería Civil

No abstract provided.