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Articles 8461 - 8490 of 11807
Full-Text Articles in Engineering
Systems Analysis Of Resources Development - California State University, Sacramento, Kaveh Madani
Systems Analysis Of Resources Development - California State University, Sacramento, Kaveh Madani
All ECSTATIC Materials
The course presents a variety of systems analysis techniques that can be used for resource planning and management in the civil engineering field. Simulation and optimization techniques (or mathematical programming) are emphasized as they apply to civil engineering problem solving. Course taught at University of Central Florida.
Imaging Of Buried Utilities By Ultra Wideband Sensory Systems, Arun Prakash Jaganathan
Imaging Of Buried Utilities By Ultra Wideband Sensory Systems, Arun Prakash Jaganathan
Doctoral Dissertations
Third-party damage to the buried infrastructure like natural gas pipelines, water distribution pipelines and fiber optic cables are estimated at $10 billion annually across the US. Also, the needed investment in upgrading our water and wastewater infrastructure over the next 20 years is estimated by Environmental Protection Agency (EPA) at $400 billion, however, non-destructive condition assessment technologies capable of providing quantifiable data regarding the structural integrity of our buried assets in a cost-effective manner are lacking. Both of these areas were recently identified several U.S. federal agencies as 'critical national need'. In this research ultra wideband (UWB) time-domain radar technology …
Development Of An Integrated Land-Use Transportation Model For Indiana, Li Jin, Jon D. Fricker
Development Of An Integrated Land-Use Transportation Model For Indiana, Li Jin, Jon D. Fricker
JTRP Technical Reports
The Indiana Department of Transportation has an operational statewide travel demand model (ISTDM). INDOT also has used the Land Use Central Indiana (LUCI) model to forecast conversion of land to residential and employment uses in future decades over a 44-county area in central Indiana. This paper describes how the LUCI model was expanded to cover the same geographic area as the ISTDM, how the internal structure of each model was made to be compatible with the other model, and how the outputs from each model were made to be suitable as inputs to the other model. The result is an …
Analysis And Determination Of Axle Load Spectra And Traffic Input For The Mechanistic-Empirical Pavement Design Guide, Yi Jiang, Shuo Li, Tommy E. Nantung, Huaxin Chen
Analysis And Determination Of Axle Load Spectra And Traffic Input For The Mechanistic-Empirical Pavement Design Guide, Yi Jiang, Shuo Li, Tommy E. Nantung, Huaxin Chen
JTRP Technical Reports
The values of equivalent single axle loads (ESAL) have been used to represent the vehicle loads in pavement design. To improve the pavement design procedures, a new method, called the Mechanistic-Empirical Pavement Design Guide (MEPDG), has been developed to use the axle load spectra to represent the vehicle loads in pavement design. These spectra represent the percentage of the total axle applications within each load interval for single, tandem, tridem, and quad axles. Using axle load spectra as the traffic input, the MEPDG method is able to analyze the impacts of varying traffic loads on pavement and provide an optimal …
Evaluation Of Performance And Design Of Ultra-Thin Whitetopping (Bonded Concrete Resurfacing) Using Large-Scale Accelerated Pavement Testing, Scott Newbolds, Jan Olek
Evaluation Of Performance And Design Of Ultra-Thin Whitetopping (Bonded Concrete Resurfacing) Using Large-Scale Accelerated Pavement Testing, Scott Newbolds, Jan Olek
JTRP Technical Reports
Ultra-Thin Whitetopping (UTW) is a pavement rehabilitation technique that involves the placement of a thin Portland Cement Concrete (PCC) overlay, 2 inches (50 mm) to 4 inches (100 mm) thick, over a distressed Hot Mix Asphalt (HMA) pavement. Typically, the HMA pavement is milled and cleaned which helps to create a bond between the existing HMA pavement and the PCC overlay. The bond between the two layers promotes composite action of the pavement section and as a result has a direct impact on the performance of the UTW Pavement. This composite action allows for the reduced thickness in the UTW …
Assessment Of Axially-Loaded Pile Dynamic Design Methods And Review Of Indot Axially-Loaded Pile Design Procedure, Dimitrios Loukidis, Rodrigo Salgado, Grace Abou-Jaoude
Assessment Of Axially-Loaded Pile Dynamic Design Methods And Review Of Indot Axially-Loaded Pile Design Procedure, Dimitrios Loukidis, Rodrigo Salgado, Grace Abou-Jaoude
JTRP Technical Reports
The general aim of the present research is to identify areas of improvement and propose changes in the current methodologies followed by INDOT for design of axially loaded piles, with special focus on the dynamic analysis of pile driving. Interviews with INDOT geotechnical engineers and private geotechnical consultants frequently involved in INDOT’s deep foundation projects provided information on the methods and software currently employed. It was found that geotechnical engineers rely on static unit soil resistance equations that were developed over twenty years ago and that have a relatively large degree of empiricism. Updated and improved static design equations recently …
Strain Sensitive Coax Cable Sensors For Monitoring Structures, Genda Chen, James L. Drewniak, Huimin Mu, David Pommerenke
Strain Sensitive Coax Cable Sensors For Monitoring Structures, Genda Chen, James L. Drewniak, Huimin Mu, David Pommerenke
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The invention provides increased structural monitoring systems that have sensitive continuous coaxial cable sensors. A preferred embodiment sensor cable of the invention includes an inner conductor, a dielectric jacket, and an outer conductor that is configured to passively deform responsively to strain in an associated structure. The deformation can be aided by the physical structure of the dielectric jacket, the outer conductor, or a combination of both. The deformation translates strain into a measurable change in a reflection coefficient associated with the outer conductor.
Application Of The Modified Log-Wake Law In Open-Channels, Junke Guo, Pierre Y. Julien
Application Of The Modified Log-Wake Law In Open-Channels, Junke Guo, Pierre Y. Julien
Department of Civil and Environmental Engineering: Faculty Publications
The modified log-wake law, which was developed for turbulent boundary layers and pipe flows, is extended to turbulent flows in open-channels. Turbulent velocity profiles in open-channels can be approximated with three components: (1) the law of the wall that results from the constant bed shear stress; (2) the law of the wake that reflects the effects of gravity, secondary currents and bed roughness; and (3) the cubic correction near the maximum velocity. A procedure to determine the four model parameters from velocity measurements while keeping κ = 0.41 is presented. The modified log-wake law compares very well with experimental data …
Watershed Management And Water Production Study For State Of Utah, Ibrahim Nourein Mohammed, David G. Tarboton
Watershed Management And Water Production Study For State Of Utah, Ibrahim Nourein Mohammed, David G. Tarboton
Civil and Environmental Engineering Faculty Publications
The amount of water produced from a watershed depends on the climate, soils, geology, land cover and land use. Precipitation water inputs in the form of rain or snow are partitioned by the watershed into evapotranspiration, runoff and groundwater recharge. This study has examined factors that may impact the production of runoff from Utah watersheds, focusing on factors related to land and watershed management. Specifically we are interested in how land use changes, such as afforestation, deforestation, agricultural, urban, industrial and mining development, impact runoff. The scale of interest is regional subbasins at the USGS cataloging unit 8 digit Hydrologic …
Hines, James Richard, 1903-1995 (Sc 1706), Manuscripts & Folklife Archives
Hines, James Richard, 1903-1995 (Sc 1706), Manuscripts & Folklife Archives
Manuscript Collection Finding Aids
Finding aid and scan (Click on "Additional Files" below) for Manuscripts Small Collection 1706. Statement of James Richard Hines, Bowling Green, Kentucky, related to expanded navigation of the Green and Barren Rivers and the potential for regional economic growth.
Evaluation Of Warm Asphalt Additives On Performance Properties Of Crm Binders And Mixtures, Chandra Akisetty
Evaluation Of Warm Asphalt Additives On Performance Properties Of Crm Binders And Mixtures, Chandra Akisetty
All Dissertations
The Warm Mix Asphalt (WMA) technologies have gained increasing popularity in recent years because of its unique property to allow the reduction in mixing and compaction temperatures of Hot Mix Asphalt (HMA) mixtures without compromising the quality of the mix. On the other hand, one of the reasons for utilizing the Crumb Rubber Modified (CRM) asphalt mixtures is that it increases the durability of the pavement by reducing the cracking and rutting potential of the pavement. However the CRM mixtures require a high mixing and compaction temperatures compared to the conventional HMA. Since the temperature requirements for CRM mixtures are …
Framework For The Fully Probabilistic Analysis Of Excavation-Induced Serviceability Damage To Buildings In Soft Clays, Matt Schuster
Framework For The Fully Probabilistic Analysis Of Excavation-Induced Serviceability Damage To Buildings In Soft Clays, Matt Schuster
All Dissertations
In this dissertation, a framework for a fully-probabilistic analysis of the potential for building serviceability damage induced by an excavation in soft clays is established. This analysis framework is established based on the concept of a serviceability limit state where the resistance is represented by the capacity of a building to resist serviceability damage, and the loading is represented by the demand on a building due to excavation-induced ground movements. In this study, both the resistance and the loading are treated as a random variable; the resistance is characterized empirically based on a database of the observed building performance while …
The Effects Of Crumb Rubber Particles On Highway Noise Reduction - A Laboratory Study, Khaldoun Shatanawi
The Effects Of Crumb Rubber Particles On Highway Noise Reduction - A Laboratory Study, Khaldoun Shatanawi
All Dissertations
Traffic noise is a major setback to the life quality of residents living in the vicinity of highways. Over the past 40 years, much legislation has been passed to regulate sound levels to which residents are exposed. Among the many approaches adopted to alleviate the problem, crumb rubber modified asphalt has been proposed as a measure to reduce highway traffic noise.
The use of crumb rubber modified asphalt to reduce traffic noise on pavements had not been evaluated in great detail prior to this study. This research investigates the effects of crumb rubber particles on asphalt pavement noise absorption ability. …
Framework For Probabilistic Analysis Of Recurrent Landslides: A Case Study Of El Berrinche, Raul Flores
Framework For Probabilistic Analysis Of Recurrent Landslides: A Case Study Of El Berrinche, Raul Flores
All Dissertations
Assessment of slope stability or landslide is a complex geotechnical problem that involves much uncertainty. To consider combined effects of the uncertainties in soil parameters and changes in pore water pressure, reliability theory may be employed. In this dissertation study, a reliability-based framework for the probabilistic analysis of recurrent landslides is developed.
Generally, the stability of a slope is analyzed deterministically with methods of limit equilibrium and a factor of safety is computed. This approach is referred to as the deterministic approach. However, a deterministic analysis alone may not be sufficient in assessing the risk level of a landslide in …
Moore, Mary (Taylor) Leiper, 1885-1973 (Sc 1714), Manuscripts & Folklife Archives
Moore, Mary (Taylor) Leiper, 1885-1973 (Sc 1714), Manuscripts & Folklife Archives
Manuscript Collection Finding Aids
Finding aid and scan (Click on "Additional Files" below) for Manuscripts Small Collection 1714. Letter from Mary Leiper Moore, Bowling Green, Kentucky to Ben Johnson, Bardstown, Kentucky, 27 September 1938, related to covered bridges at Bowling Green and Bardstown. Includes copy of an act passed by the Kentucky General Assembly authorizing reconstruction of bridges destroyed by Confederate guerrilla Billy Magruder.
A Real-Time Traffic Condition Assessment And Prediction Framework Using Vehicle-Infrastructure Integration (Vii) With Computational Intelligence, Yongchang Ma
All Dissertations
This research developed a real-time traffic condition assessment and prediction framework using Vehicle-Infrastructure Integration (VII) with computational intelligence to improve the existing traffic surveillance system. Due to the prohibited expenses and complexity involved for the field experiment of such a system, this study adopted state-of-the-art simulation tools as an efficient alternative.
This work developed an integrated traffic and communication simulation platform to facilitate the design and evaluation of a wide range of online traffic surveillance and management system in both traffic and communication domain. Using the integrated simulator, the author evaluated the performance of different combination of communication medium and …
Crumb Rubber As A Sorption Medium For Ethylbenzene In Aqueous Solution, Carmen Grayson
Crumb Rubber As A Sorption Medium For Ethylbenzene In Aqueous Solution, Carmen Grayson
All Theses
Scrap tires have always been an environmental concern. In 2005, more than 299 million scrap tires were generated in the U.S., 259 million of which were utilized in the end-use scrap tire markets such as: tire-derived fuel generation, civil engineering applications, and ground rubber applications. The different applications and usages in the scrap tire market have helped utilize up to 87% of annually generated scrap tires in the U.S. Sixteen percent of the scrap tires were utilized in civil engineering applications in 2005 because of their beneficial properties for vibration and sound control, lightweight fill, drainage and collection for underground …
Flexural Behavior Of Reinforced Concrete Beams Strengthened With Cfrp Sheets And Epoxy Mortar, Byong Y. Bahn, Ronald S. Harichandran
Flexural Behavior Of Reinforced Concrete Beams Strengthened With Cfrp Sheets And Epoxy Mortar, Byong Y. Bahn, Ronald S. Harichandran
Civil Engineering Faculty Publications
Experiments were conducted to study the effect of using epoxy mortar patch end anchorages on the flexural behavior of reinforced concrete beams strengthened with carbon fiber-reinforced polymer (CFRP) sheets. More specifically, the effect of the end anchorage on strength, deflection, flexural strain, and interfacial shear stress was examined. The test results show that premature debonding failure of reinforced concrete beams strengthened with CFRP sheet can be delayed or prevented by using epoxy mortar patch end anchorages. A modified analytical procedure for evaluating the flexural capacity of reinforced concrete beams strengthened with CFRP sheets and epoxy mortar end anchorage is developed …
Development Of The Soil Moisture Index To Quantify Agricultural Drought And Its “User Friendliness” In Severity-Area-Duration Assessment, Venkataramana Sridhar, Kenneth G. Hubbard, Jinsheng You, Eric D. Hunt
Development Of The Soil Moisture Index To Quantify Agricultural Drought And Its “User Friendliness” In Severity-Area-Duration Assessment, Venkataramana Sridhar, Kenneth G. Hubbard, Jinsheng You, Eric D. Hunt
Civil Engineering Faculty Publications and Presentations
This paper examines the role of soil moisture in quantifying drought through the development of a drought index using observed and modeled soil moisture. In Nebraska, rainfall is received primarily during the crop-growing season and the supply of moisture from the Gulf of Mexico determines if the impending crop year is either normal or anomalous and any deficit of rain leads to a lack of soil moisture storage. Using observed soil moisture from the Automated Weather Data Network (AWDN), the actual available water content for plants is calculated as the difference between observed or modeled soil moisture and wilting point, …
Development Of A Freeway Incident Rating System, Jose Javier Lopez
Development Of A Freeway Incident Rating System, Jose Javier Lopez
Civil Engineering Theses - Archive
A freeway incident rating system is proposed to classify incidents in terms of their disruptive potential to cause delays, fuel wastage, secondary accidents, and other adverse operational impacts. A two-dimensional rating scale is used which classifies incidents in terms of their severity and the number of agencies required to respond and clear incidents. Variables used in characterizing the severity include number of vehicles involved, number of lanes and shoulders blocked, time of incident occurrence, duration of incident until full clearance, and weather conditions at the time of the incident. The objective behind the development of such a rating system is …
Studies On Volume Change Movements In High Pi Clays For Better Design Of Low Volume Pavements, Thammanoon Manosuthikij
Studies On Volume Change Movements In High Pi Clays For Better Design Of Low Volume Pavements, Thammanoon Manosuthikij
Civil Engineering Dissertations - Archive
Numerous low- to medium-volume roads such as Farm Market (FM) roads constructed on expansive clay subgrades, especially in the eastern and central Texas, encounter severe pavement cracking and premature loss of serviceability. The maintenance costs, in some cases, are greater than the initial construction costs. The roads built on problematic expansive soils often become distressed due to volume changes associated with seasonal moisture content fluctuations. This dissertation research was attempted to evaluate models that predict volume changes movements of the expansive or highly plastic soils and also develop new models that could provide better prediction of volume change movements in …
Building Pressure Tests Of Fiber-Reinforced Foam-Based Lightweight Concrete Precast Wall Panels, Francheska Enid Seijo
Building Pressure Tests Of Fiber-Reinforced Foam-Based Lightweight Concrete Precast Wall Panels, Francheska Enid Seijo
Civil Engineering Theses - Archive
Instrumentation and procedures for building pressure tests were designed as a means of providing new wind pressure test methods for full-scale building models. Fiber-reinforced foam-based lightweight concrete precast wall panels were studied in this investigation. Three (3) full-scale prototype buildings were tested for this purpose. To determine the material properties and design parameters for this targeted 90 pcf (1,446 kg/m3) cellular lightweight concrete and to gain overall knowledge of its behavior, some tests such as compressive strength test, pull-out strength test, and flexural strength test were performed. The wind pressure tests performed provided results for strength, maximum wind pressure the …
Subsurface Investigations Using High Resolution Resistivity, Dharmateja Maganti
Subsurface Investigations Using High Resolution Resistivity, Dharmateja Maganti
Civil Engineering Theses - Archive
Electrical resistivity imaging has been proved to be well suited to produce images of subsurface conditionsbecause of the ability of the technique for detecting resistive features and discriminating subtle resistivity variations in the soil media. Electrical resistivity imaging survey was performed at E. Center Development in Duncanville, Texas. The survey was conducted using SuperSting R8/IP Multi-channel Resistivity Imaging System to image the subsurface structure. Both 2-D and 3-D electrical resistivity imaging tests were conducted using dipole-dipole array at 2 feet, 5 feet and 20 feet electrode spacing. Earth Imager 2D and Earth Imager 3D software's were then used to invert …
Rampart Roads In The Peat Lands Of Ireland: Genesis, Development And Current Performance, Juan Pablo Osorio, Eric R. Farrell, Brendan C. O'Kelly, Tom Casey
Rampart Roads In The Peat Lands Of Ireland: Genesis, Development And Current Performance, Juan Pablo Osorio, Eric R. Farrell, Brendan C. O'Kelly, Tom Casey
Articles
The construction and improvement of roads on peat lands has always been a challenging task in geotechnical engineering. Rampart roads, which are a particular feature of the bog roads in Ireland, are caused by the excavation of peat from the roadsides over many years for use as a domestic fuel. The historical development of rampart roads and current performance under the added traffic loading is discussed. Various road improvement methods have been applied to improve the road ability to carry traffic and the technical aspects and performance of the methods are discussed. In particular, the performance of the improvement methods …
Life Cycle Assessment Of Bio-Material Stabilized Expansive Soils, Ranjith Samuel Rosenberk
Life Cycle Assessment Of Bio-Material Stabilized Expansive Soils, Ranjith Samuel Rosenberk
Civil Engineering Dissertations - Archive
Pavement cracking is one of the major maintenance works that requires millions of dollars in repair costs annually. Pavement cracks are formed due to moisture and temperature fluctuations in the soil. Stabilization of pavement shoulder subsoil with the addition of compost material was studied for preventing pavement cracks. Eight different compost materials with three major feed stock sources such as biosolids, wood waste, and animal manure were investigated in this research. Compost treatment studies were performed at four different test sites located in various regions of the state of Texas. Laboratory experiments were conducted completed compost manufactured topsoil's (CMTs) to …
Effects Of Calcium-Based Treatment On Organic Soil Behavior, Srujan Rao Chikyala
Effects Of Calcium-Based Treatment On Organic Soil Behavior, Srujan Rao Chikyala
Civil Engineering Theses - Archive
Organic soils are found in many places around the world. Organic soils undergo large secondary settlements depending on the amount of organic matter present in the soil Organic soil is a mixture of finely divided particles of organic matter, in some instances visible fragments of partly decayed vegetable matter and shells are also present in the organic matter. In order to reduce the secondary settlements caused by organic matter, soil is treated with different stabilizing agents. The difficulties associated with organic soils arise when they are treated with cement or lime stabilizers, as organic matter inhibits cementitious reactions responsible for …
Development Of A Problem-Based Learning (Pbl) And Cooperative Learning (Cl) Transportation Engineering Course For Undergraduate Students, Deogratias Eustace
Development Of A Problem-Based Learning (Pbl) And Cooperative Learning (Cl) Transportation Engineering Course For Undergraduate Students, Deogratias Eustace
Civil and Environmental Engineering and Engineering Mechanics Faculty Publications
This study reports the findings of a project that was done during the implementation of a problem-based learning (PBL) and cooperative learning (CL) elements into an undergraduate transportation engineering course. The study procedure used the student course evaluations, including a survey questionnaire, and university-wide standardized student evaluations. Additionally, student homework, tests, and exam grades were used as part of the evaluation process. Two methods of teaching formats were evaluated: the traditional teaching method of lecturing and using end-of-chapter book questions for homework assignments and the new currently used teaching method of student field data collection, preparation of a lab report …
Implementing Scc Technology In Nebraska—All About Working Together, Mark D. Lafferty
Implementing Scc Technology In Nebraska—All About Working Together, Mark D. Lafferty
Department of Civil and Environmental Engineering: Faculty Publications
In October 2001, Concrete Industries, Inc. (CI) was working with its admixture supplier to improve our form finish for precast concrete products. They brought us a new product and before long the concrete slump became a 26‐in. (660‐mm) diameter circle. Obviously, this generated a lot of excitement with our production personnel, but we also had to consider what it would take to get architects and engineers comfortable with using it.