Impact Of Large 0.7 Inch Strand On Nu-I Girders,
2011
University of Nebraska - Lincoln
Impact Of Large 0.7 Inch Strand On Nu-I Girders, Maher K. Tadros Ph.D., P.E., George Morcous Ph.D.
Mid-America Transportation Center: Final Reports and Technical Briefs
The NU I-Girder series uses a unique cross-section and high-strength concrete to achieve longer spans. The objective of this project was to develop the quality control and design criteria required to introduce 0.7 inch strands at 2 in. spacing in NU I-Girders. Compared to 0.5 inch strands, only 1/2 of the total number of strands would be needed. This would result in immediate labor savings in precast concrete product costs. More importantly, having the ability to introduce almost twice the prestressing force, compared to 0.5 inch strands, and 135% of the prestressing force, compared to 0.6 inch strands, could result …
A Framework For The Nationwide Multimode Transportation Demand Analysis,
2011
Missouri University of Science and Technology
A Framework For The Nationwide Multimode Transportation Demand Analysis, Hojong Baik Ph.D., Yuepeng Cui, Tao Li
Mid-America Transportation Center: Final Reports and Technical Briefs
This study attempts to analyze the impact of traffic on the US highway system considering both passenger vehicles and trucks. For the analysis, a pseudo-dynamic traffic assignment model is proposed to estimate the time-dependent link flow from the intercity travelers on the network covering the continental U.S. A two-stage simulation scheme was designed to separate the intercity and non-intercity travelers involved in the link flow. The fuel consumption and emissions from the intercity travelers are estimated based on data in Mobile, the emission model developed by EPA. The suggested methodology could be adopted in further deployment of a nationwide transportation …
Transit System Evaluation Process: From Planning To Realization,
2011
Clemson University
Transit System Evaluation Process: From Planning To Realization, K Bartman, Jennifer Ogle, Mashrur Chowdhury, Anne Dunning
Publications
Many frameworks exist to help transit agencies plan, operate, and monitor the performance of transit in rural and urban communities. No framework integrates these three critical business practices into one coherent and flexible framework useful to rural and small-sized cities. The primary objective of this research was to integrate planning, operations, and performance measurement activities into a framework designed to evaluate transit in the context of overall mobility. By combining planning, evaluation, and performance monitoring processes, a succinct framework useful to transit agencies and planners was created. In addition to city entities, colleges and universities operating or contracting transit systems …
Evaluating Beat Structure And Truck Allocation For The Tarrant County Courtesy Patrol,
2011
University of Texas at Arlington
Evaluating Beat Structure And Truck Allocation For The Tarrant County Courtesy Patrol, Farzad Daneshgar
Civil Engineering Theses - Archive
Non-recurring congestion poses a significant concern to urban freeway drivers. Effective incident management relies on many tools to lessen the overall impact of crashes, road debris, and stalled/disabled vehicles. While many of the tools are based in a region's traffic management center, many urban areas have adopted freeway service patrol (FSP) programs that patrol the freeway network searching for incidents, providing aid to motorists, and assisting with incident management and clearance. While FSP operations can be assessed in terms of response and clearance times, FSP management must consider the beat structure and fleet allocation. This investigation considers response time and …
Characterization And Evaluation Of Gas Generation Potential Of Municipal Solid Waste From A Closed Section Of A Landfill,
2011
University of Texas at Arlington
Characterization And Evaluation Of Gas Generation Potential Of Municipal Solid Waste From A Closed Section Of A Landfill, Sonia Samir
Civil Engineering Theses - Archive
At present, there are more than 40 closed municipal solid waste (MSW) landfills around DFW and North Texas. A closed landfill might have potential benefits for gas recovery and utilization due to the presence of organic components in the MSW. The decomposition of organic components of MSW produces gas. The decomposition process after landfill closure may continue for 20 to 100 years depending on the operational practice of the landfill. However, to evaluate the methane potential of a closed landfill it is important to have the understanding of the characteristics of the existing or decomposed landfill wastes. The current study …
The Last Planner System For Realiable Project Delivery,
2011
University of Texas at Arlington
The Last Planner System For Realiable Project Delivery, Alok Patel
Civil Engineering Theses - Archive
The Last Planner System is a production planning system designed to produce predictable work flow and rapid learning in programming, design, construction and commissioning of projects. The Last Planner System (LPS) is developed by Glenn Ballard and Greg Howell as a production planning and control system to assist in smoothing variations in construction work flow, developing planning foresight, and reducing uncertainty in construction operations. The LPS challenges the old practices of developing schedules and pushing them from top management down to frontline people to execute. It advocates collaborative planning, performing collaborative constraint analysis, and learning from planning failures. The LPS …
Determination Of Geotechnical Properties Of Clayey Soil From Resistivity Imaging (Ri),
2011
University of Texas at Arlington
Determination Of Geotechnical Properties Of Clayey Soil From Resistivity Imaging (Ri), Golam Kibria
Civil Engineering Theses - Archive
The use of resistivity imaging (RI) in the subsurface investigation has increased in recent years. RI is a non destructive method and provides a continuous image of the subsurface. Based on the electrical conduction phenomenon of soil, spatial and temporal moisture variation and he-terogeneity of subsurface can be evaluated from RI. However, only qualitative evaluation of sub-surface can be obtained from RI. The correlation between RI results and geotechnical engineering properties of soils has become an important issue for rigorous use of this method in site in-vestigation. The current study attempts to develop the relationship and correlations between geo-technical parameters …
Comparison Of Dust Generation From Open Cut And Trenchless Technology Methods For Utility Construction,
2011
University of Texas at Arlington
Comparison Of Dust Generation From Open Cut And Trenchless Technology Methods For Utility Construction, Sahajanand Madhusudan Kamat
Civil Engineering Theses - Archive
Construction industry has changed many aspects of human life and is still evolving at a rapid pace. New and better technologies which are environmentally friendly and safe are being introduced in this industry. But with the passage of time, this industry has got riddled with loss of human life and quality due to various scenarios. One of the major contributors to such conditions is dust generated on a construction site. The amount of dust a worker inhales during his whole career is very dangerous. This research has found out that using trenchless technology, this exposure to dust can be reduced …
The Effect Of Fiber Corrosion On Shear Capacity Of Steel Fiber Reinforced Concrete Beams And An Initial Investigation On Alkali-Silica Reaction In Steel Fiber Reinforced Concrete,
2011
University of Texas at Arlington
The Effect Of Fiber Corrosion On Shear Capacity Of Steel Fiber Reinforced Concrete Beams And An Initial Investigation On Alkali-Silica Reaction In Steel Fiber Reinforced Concrete, Regina Nyambura Waweru
Civil Engineering Theses - Archive
The first part of this research aims to investigate the effect of fiber corrosion on the shear capacity of Steel Fiber Reinforced Concrete beams. It will also strive to determine at what reduction in minimum diameter of the fiber does the effect of corrosion become most severe on the shear capacity of the beam. Four simply-supported beams with a shear span to depth ratio of 3.3 were subjected to a monotonically increasing load. The targeted concrete compressive strength for all beams was 6000 psi. This however differed from the measured strength due to a number of factors as will be …
Development Of A True-Cost Concept For Renewal Of Municipal Underground Pipeline Systems,
2011
University of Texas at Arlington
Development Of A True-Cost Concept For Renewal Of Municipal Underground Pipeline Systems, Dennis Abraham
Civil Engineering Dissertations - Archive
Asset management principles for underground pipeline infrastructure (UPI) are used by municipalities for efficient delivery of water, wastewater, and storm sewers. Due to budget constraints and limited resources, municipalities need to improve their operations, utilizing an optimum cost to provide their asset management services. Life cycle costs (LCC) include the total cost of facility ownership taking into account all capital costs, operation and maintenance costs, and renewing or disposing costs. Asset management costs include the maintenance and renewal portion of LCC. The main objective of this research is to develop asset management strategies with consideration of all the cost factors …
Local Calibration Of Mechanistic Empirical Pavement Design Guide For North Eastern United States,
2011
University of Texas at Arlington
Local Calibration Of Mechanistic Empirical Pavement Design Guide For North Eastern United States, Shariq A. Momin
Civil Engineering Theses - Archive
The Mechanistic-Empirical Pavement Design Guide (MEPDG) developed under the National Cooperative Highway Research Program (NCHRP) 1-37A project is based on mechanistic-empirical analysis of the pavement structure to predict the performance of the pavement under different sets of conditions (traffic, structure and environment). MEPDG takes into account the advanced modeling concepts and pavement performance models in performing the analysis and design of pavement. The mechanistic part of the design concept relies on the application of engineering mechanics to calculate stresses, strains and deformations in the pavement structure induced by the vehicle loads. The empirical part of the concept is based on …
Fluorinated And Fluorocarbon Coating Of Tio₂ By Pulsed Plasma Processing: Improved Photocatalytic Oxidation Of Gaseous M-Xylene And Mercury,
2011
University of Texas at Arlington
Fluorinated And Fluorocarbon Coating Of Tio₂ By Pulsed Plasma Processing: Improved Photocatalytic Oxidation Of Gaseous M-Xylene And Mercury, Sulak Sumitsawan
Civil Engineering Dissertations - Archive
Titanium dioxide (TiO₂) is a preferred catalyst for photocatalytic oxidation of many air pollutants. In an effort to enhance its photocatalytic activity, TiO₂ was modified by pulsed plasma treatment. In this work, TiO₂ nanoparticles, coated on a glass plate, were treated with a plasma discharge of hexafluoropropylene oxide (HFPO) gas. By appropriate adjustment of discharge conditions, it was discovered that the TiO₂ particles can be either directly fluorinated (Ti-F) or coated with thin perfluorocarbon films (C-F). Specifically, under relatively high power input, the plasma deposition process favored direct surface fluorination. The extent of Ti-F formation increased with increasing power input. …
Effectiveness Of Public Private Partnership For Infrastructure Projects,
2011
University of Texas at Arlington
Effectiveness Of Public Private Partnership For Infrastructure Projects, Pius Francis Kwaku Agyemang
Civil Engineering Theses - Archive
Public Private Partnership (PPP) has over the years proven to be a good procurement method for Infrastructure projects. The partnership combines the efficiency, expertise, and innovation etc. of the private sector as well as appropriate risk allocation between both public and private sectors. The method also provides an alternate avenue for capital needed for engineering projects. The financing options provided through PPP makes the method increasingly popular due to the current global financial crisis. The method is employed in both developed and developing countries. The United States of America has been using the method since the 1980's. Most governments currently …
Unsaturated Soil Behavior Under Large Deformations Using A Fully Servo/Suction-Controlled Ring Shear Apparatus,
2011
University of Texas at Arlington
Unsaturated Soil Behavior Under Large Deformations Using A Fully Servo/Suction-Controlled Ring Shear Apparatus, Claudia Liliana Velosa Gamboa
Civil Engineering Dissertations - Archive
In recent years, the key hypotheses of most elasto-plastic constitutive frameworks postulated for unsaturated soils have been validated via suction-controlled oedometer, triaxial, and direct shear testing. These techniques, however, allow for the application of loads along limited modes and levels of soil deformation. Today, it is well known that most geotechnical infrastructure resting on unsaturated ground involves a wide range of deformations. Calculation of foundation settlement, for instance, requires a good estimation of soil stiffness at relatively small strains. Analysis of slopes, embankments, and soil bearing capacity, on the other hand, requires an adequate estimation of shear strength, from peak …
Web-Based Tidal Toolbox Of Astronomic Tidal Data For The Atlantic Intracoastal Waterway, Esturaries Sic] And Continental Shelf Of The South Atlantic Bight,
2011
University of Central Florida
Web-Based Tidal Toolbox Of Astronomic Tidal Data For The Atlantic Intracoastal Waterway, Esturaries Sic] And Continental Shelf Of The South Atlantic Bight, Alfredo Ruiz
Electronic Theses and Dissertations
A high-resolution astronomic tidal model has been developed that includes detailed inshore regions of the Atlantic Intracoastal Waterway and associated estuaries along the South Atlantic Bight. The unique nature of the model’s development ensures that the tidal hydrodynamic interaction between the shelf and estuaries is fully described. Harmonic analysis of the model output results in a database of tidal information that extends from a semi-circular arc (radius ~750 km) enclosing the South Atlantic Bight from the North Carolina coast to the Florida Keys, onto the continental shelf and into the full estuarine system. The need for tidal boundary conditions (elevation …
Evaluation Of Structural Monitoring Methods For Large Diameter Water Transmission Pipelines,
2011
University of Texas at Arlington
Evaluation Of Structural Monitoring Methods For Large Diameter Water Transmission Pipelines, Moksha Kizhakke Covilakam
Civil Engineering Theses - Archive
The water transmission lines span thousands of miles and form a significant part of the underground infrastructure of United States. The condition of water pipelines deteriorates with time and becomes more vulnerable to catastrophic failures and often results in costly replacement measures. With the advancement of technology, several new techniques have been developed for the condition assessment of water pipelines. However, no unified standards are followed for the selection of these technologies. Moreover, the current decision making methodology followed by water pipeline operators is usually based on individual experience and project requirements and resources. This research presents a comprehensive overview …
Shear Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams Without Shear Reinforcement,
2011
University of Texas at Arlington
Shear Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams Without Shear Reinforcement, Jae-Sung Cho
Civil Engineering Dissertations - Archive
The ACI 318-08 building code allows to use the steel fiber reinforcement as alternative shear reinforcement with satisfying certain criteria when a beam is required minimum shear reinforcement. However, this provision applies to a nonprestressed and prestressed concrete beam such that it could be conservative since the shear strength of prestressed concrete beam is generally enhanced due to the prestressing force. This is due partially to the fact that the provision has been accepted based on researches, mostly conducted in nonprestressed concrete beam. Most of experiments conducted for prestressed concrete beam in small scale tests, with a height of specimens …
Evaluation Of Resistivity Imaging (Ri) Method For Determining Unknown Deep Foundation Depth,
2011
University of Texas at Arlington
Evaluation Of Resistivity Imaging (Ri) Method For Determining Unknown Deep Foundation Depth, Mohammad Sadik Khan
Civil Engineering Theses - Archive
There are approximately 580,000 highway bridges in the National Bridge inventory and 104,000 of these bridges are estimated to have unknown foundations type and/or depth. Determining unknown foundation length and type of bridge foundation is becoming an important issue for State DOTs to ensure the safety of the bridge. There are several methods available to determine unknown foundation depth based on specific site conditions and type of foundation to be tested. Resistivity Imaging (RI) is a non destructive method to investigate the subsurface condition. The objective of current study was to determine unknown bridge foundation depth of three bridges at …
Carbon Footprint Analysis Of A Large Diameter Water Transmission Pipeline Installation,
2011
University of Texas at Arlington
Carbon Footprint Analysis Of A Large Diameter Water Transmission Pipeline Installation, Lalit Chilana
Civil Engineering Theses - Archive
The term pipeline refers to a long line of connected segments of pipe, with pumps, valves, control devices, and other equipment or facilities needed for operating the system. Water transmission pipelines are generally large diameter (more than 12 in.) pipes which transport the water from one place to another. Installation of these pipes is a complex process due to variability of ground conditions over long distance installations. Sometimes, it is difficult to relate pipelines to the environment because of the out of sight nature. But it follows a close relationship with our environment due to various energy consuming activities involved …
Experimental Investigation Of The Behavior Of The Steel Reinforced High Density Polyethylene And Corrugated Metal Pipe,
2011
University of Texas at Arlington
Experimental Investigation Of The Behavior Of The Steel Reinforced High Density Polyethylene And Corrugated Metal Pipe, Safa Sadat Masajedian
Civil Engineering Theses - Archive
Steel reinforced high density polyethylene pipes are gaining popularity these days because of their good performance and advantages of them in comparison to the other pipe materials. By inverting the steel ribs vertically in to the HDPE materials, strength of steel and flexibility and light weight of HDPE materials have been combined. However due the limited study in this area, the failure modes and design parameters are not classified.This study investigates the behavior and failure modes of SR-HDPE pipes under the simulated soil load and compares the results with the data obtained from the test on corrugated metal pipe under …
