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Articles 151 - 180 of 302
Full-Text Articles in Civil Engineering
On The Concept Of Synthetic Fiber Reinforced Thin-Walled Concrete Pipes, Arash Emami Saleh
On The Concept Of Synthetic Fiber Reinforced Thin-Walled Concrete Pipes, Arash Emami Saleh
Civil Engineering Dissertations - Archive
This research investigates the structural and industrial possibility to create a new type of concrete pipes called synthetic fiber reinforced thin-walled concrete pipes, which would be lighter, cheaper, and more durable than what is currently in use while still providing a pipe product much less dependent upon installation conditions than the very flexible metal and plastic pipes in the American market. The idea is to reduce the thickness and reinforcement of the current reinforced concrete pipes to increase their deflection before failure and control the crack formation and width by using synthetic fibers. The flexibility of these pipes will enable …
Development Of A Framework For Design And Installation Of Cementitious Spray Applied Pipe Linings In Renewal Of Corrugated Metal Culverts, Seyedmohammadsadegh Jalalediny Korky
Development Of A Framework For Design And Installation Of Cementitious Spray Applied Pipe Linings In Renewal Of Corrugated Metal Culverts, Seyedmohammadsadegh Jalalediny Korky
Civil Engineering Dissertations - Archive
Millions of culverts under road embankments provide drainage for U.S. transportation network system and are in need of maintenance, repair, and renewal. Over time culverts, like any other asset, deteriorate due to many factors. Spray applied pipe lining (SAPL) is one of the trenchless technology methods applicable for culverts renewal. In the SAPL method, polymers or cementitious materials are sprayed by machine or manually in different lifts to achieve required thickness based on the design criteria. The scope of this dissertation includes reinforced concrete pipe and corrugated metal pipe (RCP and CMP) culverts renewal with cementitious and polymer SAPLs. The …
Rainfall Simulation For Investigating Hydrologic Responses To Storm Characteristics And Facilitating Frequency Analysis, Shang Gao
Civil Engineering Dissertations - Archive
Hydrologic and Hydraulic practices depend on the characterization of extreme precipitation that is rare in nature. Despite the advancement in sensing technology, the observation record of extreme rainfall with good spatio-temporal resolution has not reached a sufficient length. Furthermore, rainfall observation may never be sufficient in a non-stationary climate. Towards solutions to these issues, rainfall simulation was explored in this study (1) to investigate hydrologic responses to storm characteristics and (2) to facilitate rainfall frequency analysis. To that end, this study initially employed storm transposition plus hydrologic simulation for generating possible rainfall-runoff scenarios which further reveal relationships between storm characteristics …
Utilizing The State Of Art Technologies To Assess And Address Urban Flooding, Daniel Li
Utilizing The State Of Art Technologies To Assess And Address Urban Flooding, Daniel Li
Civil Engineering Dissertations - Archive
Today, 55% of the world’s population lives in urban area, a proportion that is expected to increase to 60% by 2050. Projections show that urbanization, the gradual shift in residence of the human population from rural to urban areas, combined with the overall growth of the world’s population could add another 2.5 billion people to urban areas by 2050. With growing opportunities, there are great challenges. One of the challenges that urban communities are facing is the increasing flood risks. In U.S., over the past decade, extreme storm events have wreaked havoc on many urban areas. Aging and inadequate infrastructure, …
Enhancing Anaerobic Oxidation Of Methane In Landfill Cover Soil, Niloofar Parsaeifard
Enhancing Anaerobic Oxidation Of Methane In Landfill Cover Soil, Niloofar Parsaeifard
Civil Engineering Dissertations - Archive
Methane (CH4) is one of the major greenhouse gases (GHG) generated in landfills and has a global warming effect 28 times more than carbon dioxide (CO2). Therefore, decreasing methane emissions into the atmosphere from landfills is critically important. In the upper portions of a landfill cover, methane is exposed to oxygen and oxidized aerobically to carbon dioxide while passing through the cover soil; this lowers the overall contribution of the landfill to climate change. However, because of the low permeability of the landfill cover, no aerobic oxidation occurs in the bottom of the cover because oxygen cannot penetrate to those …
Effect Of Termite Gut Microorganism Tav5 Ratios On Lignin Degradation And Methane Generation From Paper, Yard, And Wood Waste, Hoda Rahimi
Civil Engineering Dissertations - Archive
Methane from anaerobic processes is being increasingly utilized as an alternative energy source in developed countries, via large projects that extract methane from landfills or wastewater treatment plants. Anaerobic degradation of organic material (biomass) involves decomposition by bacteria under humid conditions without any oxygen. Organic carbon deposited in landfills is converted by microbes to carbon dioxide (CO2) and methane (CH4). If the methane is not captured, it contributes to climate change (28 times more effectively than CO2 on a per-mass basis). If the methane is captured, it can be used as a renewable energy resource. Lignocellulose comprises a significant portion …
Economical Design Of Cold-Resistant Biogas Digesters For Degrading Household Waste In Mountainous Areas Of Developing Countries, Sunita Baniya
Economical Design Of Cold-Resistant Biogas Digesters For Degrading Household Waste In Mountainous Areas Of Developing Countries, Sunita Baniya
Civil Engineering Dissertations - Archive
Energy is a basic tool for social and economic development. However, approximately 90% of rural households in low-income countries still rely on unprocessed traditional biomass fuel as the major source of daily energy. These biomass fuels are typically burned indoors, which leads to exposures to high levels of indoor smoke and associated health risks. Sustainable management of household waste is another environmental problem for rural peoples of developing countries. Currently, 90-95% of total generated wastes in most of developing countries is disposed of in open areas and street curbs.Anaerobic decomposition of waste to produce methane is a cost-effective way of …
A Comprehensive Behavioral Study On Lane Changing Manuevers, Saeed Reza Ramezanpour Nargesi
A Comprehensive Behavioral Study On Lane Changing Manuevers, Saeed Reza Ramezanpour Nargesi
Civil Engineering Dissertations - Archive
Since changing lanes might cause traffic congestion and car crashes, the investigation on different aspects of this behavior remains critical. In the past decades, most of lane changing behavior studies have continued to model this behavior mathematically. Lack of qualitative studies in traffic flow theory concepts, especially lane changing behavior is noticeable. This study tries to conduct a comprehensive view of lane changing behavior maneuvers with consideration and analysis the steps of the lane changing process. The author uses the mixed methodological approach to understand the factors which may cause drivers to change lane. After understanding the reasons that make …
Improving Multi-Reservoir Water Supply System Operation Using Ensemble Forecasting And Global Sensitivity Analysis, Reza Limon
Civil Engineering Dissertations - Archive
The objective of this research is to improve the cost-effectiveness, reliability and resilience of water supply system operation through the utilization of ensemble forecasting and optimization of the operating policies. For the effective operation of a multi-reservoir water supply system skillful inflow and outflow forecasts are required. To that end, this research first assesses the value of medium-range ensemble precipitation forecasts generated with the HEFS developed by the US NWS in increasing skill and lead time of ensemble inflow forecasts. The skill of reservoir outflow forecasts is then assessed using three different models with varying complexity. Also assessed in the …
Sustainable Ground Improvement Method Using Recycled Plastic Pins, Md Nur Basit Zaman
Sustainable Ground Improvement Method Using Recycled Plastic Pins, Md Nur Basit Zaman
Civil Engineering Dissertations - Archive
Failure of civil engineering infrastructures due to insufficient bearing and shearing capacity of the unsuitable foundation soil is a common problem in the area of North Texas which results in significant maintenance issues for the Texas Department of Transportation (TxDOT). The major concerns regarding construction over such foundation soil includes excessive total and differential settlement of footing resulting in bearing capacity failure and sliding failure of the Mechanically Stabilized Earth (MSE) retaining structure due to inadequate shear resistance. The most common technique followed by TxDOT to counter such problem is to remove and replace the existing soil with appropriate fill …
Methane Oxidation Potential Of Uncomposted Yard Waste As A Landfill Biocover, Gomathy Radhakrishna Iyer
Methane Oxidation Potential Of Uncomposted Yard Waste As A Landfill Biocover, Gomathy Radhakrishna Iyer
Civil Engineering Dissertations - Archive
Biocovers are widely used in landfills to oxidize emissions of the greenhouse gas methane. Biocovers used till date are fully or partially made of composts. Compost takes time and effort to create, and costs about $10 per cubic yard on an average. Even more importantly, however, production of compost, although theoretically an aerobic process, actually generates methane, from 3.2 to 362 kg CO2-equivalents per ton of wet waste composted, depending on the type of waste, whether open or enclosed composting technology is used, and other factors. To reduce the net greenhouse gas emissions from biocovers, this research explores the potential …
Hpfrc And Rc Slab-Beam-Column Connections Under Extreme Earthquake Loading And Further Improvement Of Novel Double-Beam-Coupling Beams, Youngjae Choi
Hpfrc And Rc Slab-Beam-Column Connections Under Extreme Earthquake Loading And Further Improvement Of Novel Double-Beam-Coupling Beams, Youngjae Choi
Civil Engineering Dissertations - Archive
The work presented in this dissertation is divided into two parts. Each part has drawn its own results. Reinforced concrete (RC) buildings resist a strong earthquake through structural foundations, diaphragms, and vertical elements. Moment-resisting frames and shear walls are primary-used vertical elements in RC buildings. The moment-resisting frames consist of columns, beams that frame into the column and beam column joints where the columns and beams meet. A key point of designing the moment-resisting frames against a strong earthquake is to ensure beam-column connections to dissipate as much energy possible. The shear wall often becomes two separate slender cantilever walls …
Novel Infrastructure Monitoring Using Multifaceted Unmanned Aerial Vehicle Systems - Close Range Photogrammetry (Uav - Crp) Data Analysis, Surya Sarat Chandra Congress
Novel Infrastructure Monitoring Using Multifaceted Unmanned Aerial Vehicle Systems - Close Range Photogrammetry (Uav - Crp) Data Analysis, Surya Sarat Chandra Congress
Civil Engineering Dissertations - Archive
Remote sensing is a method of collecting data without making any physical contact with the object under inspection. Modern day remote sensing kicked off with the invention of the camera and continued on to the invention of advanced satellite mounted sensors. Photogrammetry is defined as a science that measures distances using one or more images captured remotely. Remote collection of images within a range of 1000 ft is termed close-range photogrammetry (CRP). Unmanned aerial vehicle systems (UAV or UAS) have become a popular means of remotely gathering information and assessing infrastructure conditions due to their versatile nature. Multirotor and fixed-wing …
Utilization Of Geocell-Reinforced Rap Material Base Layer In Flexible Pavements: Experimental And Numerical Studies, Anu Muthumala George
Utilization Of Geocell-Reinforced Rap Material Base Layer In Flexible Pavements: Experimental And Numerical Studies, Anu Muthumala George
Civil Engineering Dissertations - Archive
Reclaimed asphalt pavement (RAP) materials have been considered as one of the most sustainable and cost-effective options in the pavement industry. The use of RAP materials in pavement construction reduces natural resources depletion and the volume of construction debris discarded into the landfills. However, the low shear strength and high permanent deformation (PD) of RAP materials often limit their application in road bases. Utilization of mechanical stabilizers, such as geocell, for stabilizing RAP bases, have found to be effective in improving the pavement performance. The main objective of this study is to assess the efficacy of high-density polyethylene (HDPE) geocell …
Development Of The Urban Passenger Transportation Life Cycle Inventory For Comparison Across Modes Model (Transportlifecamm), Alma Angelica Hernandez Ruiz
Development Of The Urban Passenger Transportation Life Cycle Inventory For Comparison Across Modes Model (Transportlifecamm), Alma Angelica Hernandez Ruiz
Civil Engineering Dissertations - Archive
Against the backdrop of the increasingly complex urban passenger transportation challenges associated with megacities during the 21st century, and the effort to find the most sustainable modes of transportation for them, the spreadsheet-based model TransportLifeCAMM was developed. This model allows users in the US and Mexico to compare life cycle environmental impacts from automobile, bus, and/or subway. While other models to estimate environmental burdens from transportation exist, few of them consider emissions or energy consumption over the entire life cycle of the vehicle and the fuel (including vehicle manufacture, fuel production, maintenance, and end-of-life disposal). Furthermore, even fewer of the …
Post-Disaster Construction Labor Cost Fluctuations: Measurement And Modeling, Navid Ahmadi Esfahani
Post-Disaster Construction Labor Cost Fluctuations: Measurement And Modeling, Navid Ahmadi Esfahani
Civil Engineering Dissertations - Archive
The United States has been one of the top five countries most frequently hit by natural disasters. The post-disaster survival of cities and communities depend on their capabilities to reconstruct and repair damages to buildings and other infrastructure systems. The significant increase in the repair costs following large-scale natural disasters, also called “demand surge,” slows down the repair process that impacts many lives touched by large-scale natural disasters. Previous studies showed that post-disaster construction labor cost escalation drives the total post-disaster construction cost escalation in the U.S. The ultimate goal of this research is to (1) measure post-disaster construction labor …
Evaluation And Strengthening Of Elevated Slab On Grade With Fiber-Reinforced Polymer (Frp) Laminates, Natawut Chaiwino
Evaluation And Strengthening Of Elevated Slab On Grade With Fiber-Reinforced Polymer (Frp) Laminates, Natawut Chaiwino
Civil Engineering Dissertations - Archive
Elevating a residential house appears to be one of the most effective techniques to eliminate or alleviate flood losses. In general, the elevation procedures involve raising a house as well as its typical slab-on-grade (SOG) foundation and supporting it with an additional support system. The unconcerned effects of the drastic changes in support condition could lead to severe structural damages and failure of houses. After elevated, thus, such slabs must be properly supported and retrofitted, for which the available methodology and know-how is almost nonexistent. The fiber reinforced polymer (FRP) application, considered as a promising technique in the rehabilitation of …
Experimental And Numerical Investigation Of The Concrete Shear Strength Of Reinforced Concrete Box Culverts Under Uniformly Distributed Load, Masoud Ghahremannejad
Experimental And Numerical Investigation Of The Concrete Shear Strength Of Reinforced Concrete Box Culverts Under Uniformly Distributed Load, Masoud Ghahremannejad
Civil Engineering Dissertations - Archive
This research resulted in the development of a new method for performing displacement control analysis of distributed loads to obtain the ultimate shear strength of structural components. A framework, consisting of several sub-frames, was designed to convert the single displacement applied at the top of the framework to equivalent uniformly-distributed forces applied to the beam. To validate the loading mechanism, using the proposed framework, the load was applied on the top of a reinforced concrete beam in the laboratory, and numerical studies were conducted. The shear capacity of the beam under a concentrated load at mid-span was compared with the …
In-Service Performance Evaluation Of Fire And Impact Damaged Bridges With Cfrp Laminate Strengthening, Santosh Timilsina
In-Service Performance Evaluation Of Fire And Impact Damaged Bridges With Cfrp Laminate Strengthening, Santosh Timilsina
Civil Engineering Dissertations - Archive
Fire events and impact damage on bridges are few of the least understood of common extreme events. Bridge infrastructures that are subjected to hazards such as fire or impact from over height vehicle can catastrophically collapse or be heavily damaged. External wrapping of damaged concrete bridge components with Fiber Reinforced Polymer (FRP) laminates has been used as a strengthening technique for these bridges. Two such in-service bridges, one of which was fire damaged and the other impact damaged, both aged more than 50 years old in Irving, Texas, were selected for this study. The damaged beams of the concrete bridges …
Developing A Framework To Optimize The Operations Of An Intermodal Underground Freight Transportation Terminal Using Simulation, Fatemeh Rezaeifar
Developing A Framework To Optimize The Operations Of An Intermodal Underground Freight Transportation Terminal Using Simulation, Fatemeh Rezaeifar
Civil Engineering Dissertations - Archive
According to the U.S. Department of Transportation (USDOT), by 2040, nearly 30,000 miles of our busiest highways will be clogged daily and it is important to increase the capacity of our transportation system. Construction of intermodal underground freight transportation (UFT) systems for freight movement through underground pipelines or tunnels, can increase the capacity of the existing shipping network. The intermodal terminal is a major component of the UFT’s innovative infrastructure project. Increasing demand for container transportation systems in terminals will raise the risk of terminal congestion and delivery delay due to the increase in freight transportation system bottlenecks (traffic jams …
Development Of A Framework To Estimate Social And Environmental Costs Of Truck, Railroad, And Underground Freight Transportation, Amir Tabesh
Civil Engineering Dissertations - Archive
Increasing freight transportation capacity is the most important factor to keep US economy viable. Trucks moved 11.5 billion tons of goods, or 63.8 percent of total freight shipments in 2015, which is projected to grow to 16.6 billion tons by 2045. It is predicted truck travel may increase from 282 million miles per day in 2012 to 488 million miles per day by 2045. The U.S. railroad system includes 138,000 rail miles, which 93,500 miles owned and operated by Class I railroad and the rest of them owned and operated by regional and local railroads. While the miles of railroad …
Planning, Design, And Operational Analysis Of Underground Freight Transportation Systems With Individual Autonomous Vehicles, Sirwan Shahooei
Planning, Design, And Operational Analysis Of Underground Freight Transportation Systems With Individual Autonomous Vehicles, Sirwan Shahooei
Civil Engineering Dissertations - Archive
Given the increases in freight transportation demand, the current infrastructure for freight transportation appears insufficient. Moreover, the future development of capacity for freight transportation infrastructure seems to be limited. Based on a U.S. DOT report, most of the U.S. freight transportation infrastructure’s construction dates back to the 1960s. This puts a heavy burden on the national highway and railroad systems. The growing demand for freight will increase truck traffic on both urban and rural highways. The increase in truck traffic on highways will result in multiple challenges, including traffic congestion, security concerns, infrastructure deterioration, environmental pollution, energy consumption, increase in …
Evaluation Of Fiber Reinforced Polymer (Frp) Strengthening For Deteriorated Bridge Bent Caps, Yazan Almomani
Evaluation Of Fiber Reinforced Polymer (Frp) Strengthening For Deteriorated Bridge Bent Caps, Yazan Almomani
Civil Engineering Dissertations - Archive
Deterioration of aging highway bridges has been a serious concern in the U. S. A. Almost 39% percent of all bridges in the country have passed their 50-year design life, and approximately 9% of these bridges are structurally deficient due to concrete deterioration and truck weight increases on highways. Compared to superstructures, the deterioration of bridge substructures and associated repair/strengthening/evaluation has received much less attention in previous studies. A reinforced concrete bridge built in 1940 and located in Dallas, Texas, exhibited moderate to severe corrosion related concrete deterioration in the bent caps. Eight such bent caps were selected herein for …
A New Approach For Performance Evaluation Of Bridge Infrastructure Using Terrestrial Lidar And Advanced Mathematical Modeling, Ali Shafikhani
A New Approach For Performance Evaluation Of Bridge Infrastructure Using Terrestrial Lidar And Advanced Mathematical Modeling, Ali Shafikhani
Civil Engineering Dissertations - Archive
High plastic expansive clays when subjected to different climatic conditions undergo large ground movements causing distress to infrastructures including bridges, pavements, buildings, retaining structures, and others. Performance assessment of these structures built on problematic soils such as expansive clays is important to reduce maintenance and extending the design life of infrastructure. Rapid developments in remote sensing technologies with precise evaluation have influenced the monitoring techniques for assessing the health condition of civil infrastructure projects. While these technologies have considerably aided in performance evaluation, cogent procedures for evaluating the ground movements are still required that integrates technologies, climatic factors, soil behavior …
A Comprehensive Seismic Response And Slope Stability Analysis Framework For Evaluating The Stability Of Hydraulic-Fill Dams, Sayantan Chakraborty
A Comprehensive Seismic Response And Slope Stability Analysis Framework For Evaluating The Stability Of Hydraulic-Fill Dams, Sayantan Chakraborty
Civil Engineering Dissertations - Archive
The stability and serviceability of earthen embankment structures such as dams and levees are extremely crucial to avoid the catastrophic consequences of the failure of these structures. Such man-made geo-structures are usually stable under normal working conditions; however, the stability and subsequent functionality may be affected during earthquake events. Hence, the evaluation of seismic response and structural stability of earthen dams is an important facet in the field of geotechnical earthquake engineering. Dams and levees built in earthquake-prone regions are usually designed to withstand expected seismic events, and in-depth time-history-based dynamic analyses are typically performed to assess the behavior of …
Algorithm Development For Sewer Pipe System Condition Assessment Using Multi-Sensor (Msi) Technology, Mohammed Al Asadi
Algorithm Development For Sewer Pipe System Condition Assessment Using Multi-Sensor (Msi) Technology, Mohammed Al Asadi
Civil Engineering Dissertations - Archive
This study investigates the performance of all the current large-diameter pipeline system of The City of Arlington (COA) sewer lines of 48 miles (24-inch inner diameter and above for rigid and flexible pipes). Proper inspection and rehabilitation plan for the city sewer pipeline system are better choice for the municipality and tax payers in terms of cost than dealing with pipe damage and collapsing problems when they happen. The City of Arlington (COA), University of Texas at Arlington (UTA) and RedZone Robotics have established a Technology Partnership Program (TPP) to perform a condition assessment on the all COA large diameter …
Sustainable Waste Management Through Operating Landfill As Biocell, Naima Rahman
Sustainable Waste Management Through Operating Landfill As Biocell, Naima Rahman
Civil Engineering Dissertations - Archive
Solid waste is being generated at a record pace, and disposal of it requires advanced waste management services at a reasonable cost. Landfilling is the most suitable waste disposal and management technique currently available, and it is being used throughout the world. It is, however, the largest anthropogenic source of atmospheric methane, and it requires a lot of space. The primary objective of this study was to investigate an alternative sustainable solution to waste management by operating landfills as biocells. Biocells are cost effective, produce methane more rapidly, and accelerate space recovery. A laboratory scale study was conducted to investigate …
Remaining Useful Life Prediction Of Water Pipes Using Artificial Neural Network And Adaptive Neuro Fuzzy Inference System Models, Razieh Tavakoli
Remaining Useful Life Prediction Of Water Pipes Using Artificial Neural Network And Adaptive Neuro Fuzzy Inference System Models, Razieh Tavakoli
Civil Engineering Dissertations - Archive
The U.S. water distribution system contains thousands of miles of pipes with differing materials, sizes, and ages. These pipes experience physical, environmental, structural and operational parameters that cause corrosion and eventually lead to their failures. The Remaining Useful Life (RUL) is the estimated time before a pipe will experience a failure mode specifically a pipe break. Pipe failure means collapse and deterioration of water pipes overtime. Pipe deterioration results in increased break rates, reduced hydraulic capacity, and detrimental impacts on water quality. Therefore, it is crucial to perform accurate models that can forecast deterioration rates along with estimates of remaining …
Comparison Of Ground Movements During Trenchless Technology Operations For Pipe And Box Installations By Numerical Analysis, Taha Ashoori
Comparison Of Ground Movements During Trenchless Technology Operations For Pipe And Box Installations By Numerical Analysis, Taha Ashoori
Civil Engineering Dissertations - Archive
Trenchless Technologies (TTs) are alternatives or methods of choice for the construction and renewal of buried pipe or box with little or no surface disruption. Specifically, TTs are used when other traditional methods, such as cut-and-cover methods are not physically possible. Other reasons for TT methods to be increasingly adopted by owners, engineers, and contractors are their low environmental impacts and, based on the project and the site conditions, lower costs per foot of installed pipe, making these technologies much more efficient and versatile with final results within a shorter time span. Trenchless technology methods are divided into two main …
Environmental Life Cycle Assessment Of Commercial Space Transportation Activities In The United States, Shelia Scott Neumann
Environmental Life Cycle Assessment Of Commercial Space Transportation Activities In The United States, Shelia Scott Neumann
Civil Engineering Dissertations - Archive
The Commercial Space Transportation (CST) activities in the United States are increasing and have increased over 50% in the last year. The launches in the United States for commercial purposes are expected to increase another 50% in the next 3-5 years. National Environmental Policy Act (NEPA) environmental assessments do provide the regulatory environmental analysis for launching space vehicles within the United States. However, the environmental impacts from these launches have not been fully characterized. One method to characterize environmental impacts from a system is through conducting a Life Cycle Assessment (LCA) based on an international standard, ISO14040. The results from …