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Articles 181 - 210 of 302
Full-Text Articles in Civil Engineering
Assessment Of Sustainability And Resilience In Transportation Infrastructure Geotechnics, Jasaswee T. Das
Assessment Of Sustainability And Resilience In Transportation Infrastructure Geotechnics, Jasaswee T. Das
Civil Engineering Dissertations - Archive
Transportation infrastructure, such as roads, embankments, bridges, railroads, airports, docks, and canals, serve as pathways for the mobility of people, goods, and services, and form the backbone of cities and communities. The construction, operation, and rehabilitation of these facilities put significant strain on the local, state, and federal agencies, including depletion of natural resources, and contributing to the global carbon footprint and greenhouse gas emissions. Further, these features stimulate anthropocentric development in a region which affects the land-use patterns and influences the demography of communities. In recent years, most transportation infrastructure are typically designed to withstand external and internal disturbances …
Framework For Determining The Pullout Resistance Of Inextensible 2-Wire Soil-Reinforcing Elements Embedded In Sand, Thomas Patrick Taylor
Framework For Determining The Pullout Resistance Of Inextensible 2-Wire Soil-Reinforcing Elements Embedded In Sand, Thomas Patrick Taylor
Civil Engineering Dissertations - Archive
Mechanically Stabilized Earth (MSE) has been successfully used as a commercial retaining structure since its development in 1963 by Henry Vidal (Schlosser 1990). MSE is a ground improvement system that consists of soil-reinforcing, compacted backfill, and a facing. The initial soil-reinforcing developed for commercial use by Vidal consisted of a smooth steel strip. Since then, a diverse range of soil-reinforcing has been developed, including extensible and inextensible reinforcing. The various geometric configurations of soil-reinforcing have included wide width and narrow width elements comprising planar strips, planar grids, co-planar strips, co-planar grids, and wide sheets. General specifications categorize inextensible soil-reinforcing into …
Shear Behavior Of Synthetic Fiber Reinforced Concrete Box Culverts, Mahnaz Mostafazadeh
Shear Behavior Of Synthetic Fiber Reinforced Concrete Box Culverts, Mahnaz Mostafazadeh
Civil Engineering Dissertations - Archive
This research pursues a comprehensive experimental study on the shear capacity of zero-slump, dry-cast Synthetic Fiber-Reinforced Concrete (SYN-FRC) with the aim of reducing or even eliminating stirrups in box culverts. Since using stirrups in structures such as box culverts need labor work and cause reinforcement congestion, eliminating or reducing stirrups in design, prevent poor-quality concrete, help better concrete compaction and could save manufacturer time and money over the years. This study first determined the shear capacity of synthetic fiber concrete matrix by varying fiber volume fraction. Then, FEA and full experimental tests have been conducted to evaluate the effect of …
Evaluation Of Plant Root On The Performance Of Evapotranspiration (Et) Cover System, Md Jobair Bin Alam
Evaluation Of Plant Root On The Performance Of Evapotranspiration (Et) Cover System, Md Jobair Bin Alam
Civil Engineering Dissertations - Archive
The performance of an evapotranspiration (ET) cover for a landfill exceeds that of a conventional landfill final cover. Its low percolation and high evapotranspiration rely on the properties of unsaturated soils, the energy demands of plants, and the atmosphere. Plant roots pull water out of the cover soil and release it into the environment, thus managing water in a much more natural way than the conventional cover, where water is controlled by creating a physical barrier. Therefore, plant roots are a significant component in the optimization of ET cover performance. In recent years, a great deal of effort has been …
Quantitative Non-Destructive Evaluation (Nde) Of Frp Laminate-Concrete Bond Strength, Mina Riad
Quantitative Non-Destructive Evaluation (Nde) Of Frp Laminate-Concrete Bond Strength, Mina Riad
Civil Engineering Dissertations - Archive
Repair and rehabilitation methods for civil infrastructure have become a topic of great interest to engineers. Fiber Reinforced Polymer (FRP) is considered as one of the most popular and practical solutions for strengthening and retrofitting of civil infrastructure. Several past studies indicated that significant increase in strength and stiffness can be achieved by using this technology. The FRP-concrete interface bond is critical in transferring stresses from the concrete surface to the FRP. However, the evaluation of the bond strength is still a challenging issue. To evaluate the bond strength using non-destructive techniques, 32 concrete beams strengthened with FRP using different …
Effects Of Climatic Loading In Flexible Pavement Subgrades In Texas, Asif Ahmed
Effects Of Climatic Loading In Flexible Pavement Subgrades In Texas, Asif Ahmed
Civil Engineering Dissertations - Archive
Expansive soils, which have been reported as a worldwide problem, cover 25% of the United States. Due to the swelling and shrinkage behavior induced by moisture variations, expansive soil contributes to volumetric deformation, which in turn affects the stability and performance of structures. The Texas Department of Transportation (TxDOT) allocates 25% of its budget to pavement maintenance and repairs, much of which is triggered by expansive soil. In order to decrease the burden of this expense on maintenance authorities, it is necessary to have an accurate understanding of expansive subgrade behavior. Applying this knowledge to the pavement design and construction …
Non-Destructive Evaluation Of Soil Moisture In Evapotranspiration Cover System, Md Ishtiaque Hossain
Non-Destructive Evaluation Of Soil Moisture In Evapotranspiration Cover System, Md Ishtiaque Hossain
Civil Engineering Dissertations - Archive
A conventional landfill cover system is designed as a barrier layer system, with low hydraulic conductivity, to minimize the percolation of water from the cover to the waste. Evapotranspiration (ET) covers are currently becoming a popular alternative that are acceptable to landfill authorities, due to their cost effectiveness and nature-friendly performance. The principle function of the ET cover is to store the infiltrated water, using the water balance technique, until it is transpired by plants into the atmosphere, thus minimizing percolation. The performance of the final cover system is assessed by monitoring the soil moisture in the ET cover and …
Development Of A Production Estimation Model For Tunnel Boring Machines (Tbms), Saeed Janbaz
Development Of A Production Estimation Model For Tunnel Boring Machines (Tbms), Saeed Janbaz
Civil Engineering Dissertations - Archive
Advance rate (AR) estimation is a crucial factor at the conceptual phase of a tunneling project for preliminary estimation of tunnel boring machines' (TBMs') usage. The primary objective of this research is to develop order of magnitude performance charts for advance rate of TBMs that can be used using the limited information about the tunneling progress at the conceptual phase. The secondary objective of this dissertation is to evaluate factors that impact TBM progress in large diameter applications. Tunnel diameter and uniaxial compressive strength of ground are found to be some of the primary parameters for prediction of advance rate. …
Fatigue Impacts On Hdpe Pipe Material Properties, Marjan Shahrokh Esfahani
Fatigue Impacts On Hdpe Pipe Material Properties, Marjan Shahrokh Esfahani
Civil Engineering Dissertations - Archive
During a pipe’s life cycle, failures occur due to numerous factors such as age, loading conditions, environmental conditions, installation quality, manufacturing procedures, operation and maintenance strategies and so on. Frequent pressure surges or fluctuations in a piping system may cause a fatigue failure as fatigue is one of the most important issues in water pipes due to water hammer impacts. Application of buried High Density PolyEthylene (HDPE) water pipelines has significantly increased in recent years, and PE4710 is a new member of HDPE family. So, there is not yet enough information about PE4710 long-term performance. Due to lack of enough …
Seismic Performance Of Double-Channel And Double-Hss Sections, Special Truss Moment Frame With Buckling Restrained Braces, And Long Span Special Truss Moment Frame, Chatchai Jiansinlapadamrong
Seismic Performance Of Double-Channel And Double-Hss Sections, Special Truss Moment Frame With Buckling Restrained Braces, And Long Span Special Truss Moment Frame, Chatchai Jiansinlapadamrong
Civil Engineering Dissertations - Archive
Until recently, all special truss moment frame (STMF) experimental research was done on only double angle STMFs. In order to satisfy the code seismic drift limitation, especially for mid-rise and tall multistory buildings, a large column section is needed, when double angle sections are used. However, heavy chord members can be used in this instance. Due to configuration of STMFs, the chord members in the special segment of an STMF experience higher rotational demand than the story drift. As a result, there is a need to verify large rotational capacity of other heavy steel shapes. Recent analytical investigation and experimental …
Making Public Health Performance Measures For Transportation Accessible To Practitioners, Ziaur Rahman
Making Public Health Performance Measures For Transportation Accessible To Practitioners, Ziaur Rahman
Civil Engineering Dissertations - Archive
Pollutants emitted into the atmosphere from static and mobile sources pose a threat to human health. The detrimental impact associated with air pollution varies by the type of pollutant, the magnitude, frequency and duration of exposure, and the associated toxicity. While stationary sources play an important role in air pollution, motor vehicle exhaust emissions represent the single largest source of regional air pollution in urban areas. Moreover, outdoor physical activity requires an increased oxygen level with an increase in exercise intensity. Research has shown that both the ventilation and deposition fractions increase significantly during outdoor activities, which may lead to …
Integrated Modeling Of Storm Drain And Natural Channel Networks For Real-Time Flash Flood Forecasting And Stormwater Planning And Management In Large Urban Areas, Hamideh Habibi
Civil Engineering Dissertations - Archive
Urban flash flooding is a serious problem in large highly populated areas such as the Dallas–Fort Worth metroplex (DFW). Being able to monitor and predict flash flooding at a high spatiotemporal resolution is critical to mitigating its threats and for cost effective emergency management. In this reserach, a high-resolution flash flood forecast system which operates in real time is developed for DFW using a gridded distributed hydrologic model and high-resolution quantitative precipitation estimates from the DFW Demostration Network of the Collaborative Adaptive Sensing of the Atmosphere (CASA) Program high-resolution X band radars and the National Weather Service (NWS) NEXRAD radar. …
Response Of Unsaturated Soils Under Monotonic And Dynamic Loading Over Moderate Suction States, Aritra Banerjee
Response Of Unsaturated Soils Under Monotonic And Dynamic Loading Over Moderate Suction States, Aritra Banerjee
Civil Engineering Dissertations - Archive
The understanding of the mechanical behavior of the unsaturated soils has been significantly enhanced due to the recent advancement of technology and modifications to the conventional testing devices. However, the implementation of the concepts of unsaturated soil has lagged, mainly due to the risks associated with the development of civil infrastructure based on practically untested theories and the limited reliable prediction methods for compacted, expansive, residual, and collapsible soils, which requires reliable and comprehensive experimental data. Moreover, the tests on unsaturated soils are enormously time consuming and often exorbitantly expensive, which further hinders the use of unsaturated soil mechanics in …
Structural Competency And Environmental Soundness Of The Recycled Base Materials In North Texas, Mohammad Faysal
Structural Competency And Environmental Soundness Of The Recycled Base Materials In North Texas, Mohammad Faysal
Civil Engineering Dissertations - Archive
Aggregates, which are derived from natural resources, are the most important raw materials used in pavement construction; however, depletion of the natural resources, increasing labor costs, and environmental concerns have led us to look for alternatives. Recycled materials, such as recycled crushed concrete aggregate (RCCA) and reclaimed asphalt pavement (RAP), can be used as an alternative to natural aggregates and can be obtained from construction of newer structures and demolition of existing structures, such as buildings, bridges, pavement, etc. Recycled materials can reduce the cost, depletion of natural resources, and construction debris. The properties of recycled materials are source-dependent, which …
Development Of A New Joint System For A Circular-Shaped Infrastructure, Sugyu Lee
Development Of A New Joint System For A Circular-Shaped Infrastructure, Sugyu Lee
Civil Engineering Dissertations - Archive
This dissertation focused on development of new carbon fiber joint systems for all types of underground gravity and sewer pipe systems. Specifically, the external CFRP wrap and, particularly, the carbon fiber reinforced polymer (CFRP) internal coupler can be used for concrete pipes with regular or reduced wall thicknesses. The concrete pipes with reduced wall thickness are classified as semi-rigid pipe and are referred to as thin-wall (TW) concrete pipe. The performance of the CFRP coupler is presented in this report based on full-scale experimental tests and three dimensional non-linear finite element studies for regular and thin wall pipes. Finally, design …
Long-Term Shear Investigation Of Polypropylene Fiber-Reinforced Concrete Beams, Michael Daniels
Long-Term Shear Investigation Of Polypropylene Fiber-Reinforced Concrete Beams, Michael Daniels
Civil Engineering Dissertations - Archive
This study investigates the long-term influence of polypropylene fibers on the shear strength and failure behavior of longitudinally reinforced concrete beams, with or without stirrups, subjected to accelerated aging conditions. For this study, 32 large scale short beams with different volume fractions of polypropylene fibers were casted and tested in the Civil Engineering Laboratory Building (CELB) at the University of Texas at Arlington: (1) Control reinforced concrete beams (RC); (2) Reinforced concrete beams with minimum stirrups (RCS) according to ACI 318; (3) Synthetic fiber-reinforced concrete beams with Vf=0.5% (SNFRC 0.5%), which correspond to 7.67 lbs./yd3 (4.55 kg/m3)’; and (4) Synthetic …
A Comprehensive Resilience Framework For The Seismic Evaluation Of Hydraulic Fill Dams In North Texas, Santiago R. Caballero
A Comprehensive Resilience Framework For The Seismic Evaluation Of Hydraulic Fill Dams In North Texas, Santiago R. Caballero
Civil Engineering Dissertations - Archive
Hydraulic filling is a construction procedure that was used for earthen structures during the mid-1800s to the early 1900s; however, dams and levees that were constructed by implementing this technique had a significant potential for geotechnical hazards. Historically, most of the failures of these structures were a result of the soil cyclic liquefaction phenomenon. This phenomenon occurs when excess pore water pressure develops during cyclic loading and causes loss of effective strength in the soil. The cyclic stress approach is one of the methods widely used to assess cyclic liquefaction; however, seismic parameters (loading conditions) and soil characterization (liquefaction resistance) …
Development Of Cone Testing Device For Improved Deep Foundation Design Protocols, Hai Minh Nguyen
Development Of Cone Testing Device For Improved Deep Foundation Design Protocols, Hai Minh Nguyen
Civil Engineering Dissertations - Archive
A novel cone penetration test device, the P-cone, has been developed to assist in deep foundation design and this P-cone device combines features of CPTU cone sounding technologies with capabilities to perform bidirectional loading at a given soil depth condition. Using two independent systems, the P cone measures shear stress versus movements of cone shaft and stress versus penetration of the cone tip at desired depths. The P-cone can also improve the penetration depth and offer a potential application for the in situ consolidation test. Laboratory experiments of the P-cone device were successful beyond the expectation. P-cone Tests performed on …
Toward High-Resolution Flood Forecasting For Large Urban Areas - New Solutions For 1d Routing, Behzad Nazari
Toward High-Resolution Flood Forecasting For Large Urban Areas - New Solutions For 1d Routing, Behzad Nazari
Civil Engineering Dissertations - Archive
The ability to forecast flow, depth, and velocity in flooding events is one of the most important needs in highly populated urban areas. Urbanization and climate change highlight the necessity to understand and accurately predict water-related hazards in urban areas due to extreme precipitation. Towards that end, this study initially assesses the impact of changes in precipitation magnitude and imperviousness on urban inundation in a flooding prone urban catchment in the Dallas-Fort Worth Metroplex. Consequently, this study focuses on identifying potential alternatives to the conventional inundation models to improve operational viability of real-time flood forecasting in urban areas by downscaling …
Hydraulic Performance Evaluation Of Evapotranspiration Cover Systems, Brett James De Vries
Hydraulic Performance Evaluation Of Evapotranspiration Cover Systems, Brett James De Vries
Civil Engineering Dissertations - Archive
Although alternative covers such as the evapotranspiration (ET) landfill cover system promise to provide equivalent or greater performance than conventional cover systems, uncertainties remain on the performance of these type of cover systems. The uncertainties associated with performance may derive from the relative newness of these covers (when compared to conventional landfill cover systems); and their dependency on relatively site-specific factors such as: climatic, vegetation, and soil conditions. As a results, the Texas Commission on Environmental Quality (TCEQ) requires a landfill facility to design and then verify the design and performance through site specific field scale testing (TCEQ 2012). Utilizing …
Novel Approach For Selective Decomposition Of Target Water Contaminants Onto Porous Titanium Dioxide, Abolfazl Zakersalehi
Novel Approach For Selective Decomposition Of Target Water Contaminants Onto Porous Titanium Dioxide, Abolfazl Zakersalehi
Civil Engineering Dissertations - Archive
Manipulation of physical and chemical properties of matter with nanoscale precision will enhance our ability for fabrication of material with intended characteristics for environmental applications. In this study we presented two main frameworks for addressing non-selectivity issue in TiO2 photocatalysts, which is believed to be a major drawback in full-scale application of this technology. First, a purely physical approach for enhancing selectivity of nanostructured TiO2 photocatalysts toward water target contaminants have been achieved via tailor-designing meso-porous structure of TiO2. This simple, yet effective method is mainly based on size-exclusion as a mean toward preferential decomposition. It was hypothesized controlled mesoporous …
Harmful Algal Blooms And Biological Toxins Productions; From Integrated Monitoring Approach To On-Site Solar Photocatalytic Decomposition, Hesam Zaman Khan Malayeri
Harmful Algal Blooms And Biological Toxins Productions; From Integrated Monitoring Approach To On-Site Solar Photocatalytic Decomposition, Hesam Zaman Khan Malayeri
Civil Engineering Dissertations - Archive
Occurrence of Harmful Algal Blooms (HABs) worldwide has caused concern to environmental and health authorities because of their potential to generate and release biological toxins. In particular, microcystins (MCs) produced from cyanobacteria are of great concern. MCs are among the most powerful natural poisons. The presence of MCs in drinking water sources has raised major concern. The overall goal of this research is to predict formation of biological toxins in water bodies and to develop a new sustainable approach to decompose them, if feasible, on-site and in real-time with minimal efforts, less chemicals, and low energy inputs. In order to …
Moisture Distribution Efficiency And Performance Evaluations Of Bioreactor Landfill Operations, Md Zahangir Alam
Moisture Distribution Efficiency And Performance Evaluations Of Bioreactor Landfill Operations, Md Zahangir Alam
Civil Engineering Dissertations - Archive
Bioreactor landfills are operated in a modern engineered way to accelerate waste decomposition, gas production, and waste stabilization. The major aspect of a bioreactor landfill operation is associated with the addition of supplemental liquid or leachate recirculation, and the effective operation primarily depends on efficient moisture distribution throughout the waste mass, which enhances performance. The performance of an effective landfill operation can be assessed by several indicators, i.e., leachate generation, gas production, and landfill settlement. Bioreactor landfill operations have several significant economic and environmental advantages, but the impact of efficient moisture distribution and the assessment of performance through combined indicators …
Hydrocarbon Pool Fire Performance Of Fiber Reinforced Polymer (Frp) Strengthened And Thermally Insulated Bridge Girders, Eyosias Solomon Beneberu
Hydrocarbon Pool Fire Performance Of Fiber Reinforced Polymer (Frp) Strengthened And Thermally Insulated Bridge Girders, Eyosias Solomon Beneberu
Civil Engineering Dissertations - Archive
Highway bridges encounter various extreme load hazards, such as earthquake, flood, blast, collision, wind and fire during their design lives. The effect of accidental, natural or man-made fire on bridges is one of the least investigated which may be due to the assumption that bridge fire has a low probability of occurrence. However, a bridge failure survey showed that fire had caused more bridge collapse in the USA than earthquakes. The main objective of the current research is to study concrete bridges in general, and fiber reinforced polymer (FRP) strengthened bridge girders in particular against fire hazard. The research is …
Life Cycle Assessment Of Greenhouse Gas Emissions, Traditional Air Pollutants, Water Depletion, And Cumulative Energy Demand From 2-Mw Wind Turbines In Texas, Ali Alsaleh
Civil Engineering Dissertations - Archive
¶One renewable energy source that has witnessed a significant growth in the recent years is wind energy, with the installation of new wind farms around the globe as well as the innovations in wind power technology, which have increased the efficiency of this source. Wind power generates electrical energy from the wind’s kinetic energy without causing emissions or pollution from power production; however, environmental effects are caused by the wind turbine manufacturing, transport, and other phases. Therefore, the overall goal of this study was to analyze the environmental effects associated with wind energy technology by taking into consideration the entire …
Evaluation And Development Of A Structurally Enhanced Pvc Water Pipe, Ameya Brahmanand Paradkar
Evaluation And Development Of A Structurally Enhanced Pvc Water Pipe, Ameya Brahmanand Paradkar
Civil Engineering Dissertations - Archive
Many U.S. utilities rely upon iron pipe to deliver water through their distribution network. It has only been in the past 50 years that other products have penetrated into the water utilities' pipeline. The industry has turned to various cementitious and plastic materials largely to overcome aggressive soil and water that can be corrosive to metallic pipes. This dissertation will discuss a new pipe material called iPVC pipe manufactured by Pyunghwa Pipe Industry Inc. (PPI), South Korea. The iPVC pipe was evaluated by a series of selective testing on the pipe, including impact, stiffness, tensile, short-term hydrostatic burst pressure, fatigue …
Numerical And Experimental Investigation Of Buried Large-Diameter Steel Pipes With Controlled Low-Strength Material, Margarita Takou
Numerical And Experimental Investigation Of Buried Large-Diameter Steel Pipes With Controlled Low-Strength Material, Margarita Takou
Civil Engineering Dissertations - Archive
The main goal of this research was to gain an in-depth understanding of the behavior of buried large-diameter pipes with controlled low-strength material (CLSM). Design equations were developed based on extensive parametric studies that aimed for an optimized design for designers in industry. Both experimental and numerical methods were espoused in the investigating procedure. The pipe-soil structure characteristics of the experimental analysis were: (a) steel pipe diameter of 108 in., (b) steel pipe thickness of 0.47 in., (c) mortar liner applied at the inner surface of the pipe with thickness of 0.5 +1/6 in., (d) CLSM applied around the pipe …
Integrated Evaluation Of Greenhouse Gas Emissions, Traditional Air Pollutants, And Economics Of Three Types Of Landfills, Reza Broun
Civil Engineering Dissertations - Archive
Despite the decreasing rate of landfilled waste due to increases in reuse and recycling, landfilling remains an enormous part of the waste industry of the United States due to population and economic growth. In addition, certain wastes are not easily recycled due to their mixed composition (i.e. a cardboard carton with a plastic lining) or their contamination (i.e. diapers). The primary goal of this research is to develop a comprehensive framework that can help landfill designers chose the best type of landfill (conventional, bioreactor, or aerobic) for a given situation based on greenhouse gas (GHG) emissions, traditional air pollutants and …
A Decision Support System For Traffic Diversion Around Construction Closures, Arezoo Memarian
A Decision Support System For Traffic Diversion Around Construction Closures, Arezoo Memarian
Civil Engineering Dissertations - Archive
As highway infrastructure ages and road congestion increases, roads need to be expanded and reconstructed. It results in creating many construction sites and work zones on highways, which leads to an unavoidable interruption in normal traffic flows and have resulted in traffic congestion, more vehicle emissions, and traffic safety problems. During roadway construction, when lanes or entire highway sections must be temporarily closed, traffic managers would like to inform motorists of alternative routes around the construction site well in advance of the project location. This would help reduce traffic demand through the construction site, enhance the safety of the workers …
Group Assignment And Annual Average Daily Traffic Estimation Of Short-Term Traffic Counts Using Gaussian Mixture Modeling And Neural Network Models, Sunil Kumar Madanu
Group Assignment And Annual Average Daily Traffic Estimation Of Short-Term Traffic Counts Using Gaussian Mixture Modeling And Neural Network Models, Sunil Kumar Madanu
Civil Engineering Dissertations - Archive
The grouping of similar traffic patterns and cluster assignment process represent the most critical steps in AADT estimation from short-term traffic counts. Incorrect grouping and assignment often become a significant source of AADT estimation errors. For instance, grouping a commuter traffic trend pattern into a recreational traffic trend may produce an erroneous AADT value. The traditional knowledge-based methods, often aided with visual interpretation, introduce subjective bias while grouping traffic patterns. In addition, the grouping requires personnel resources to process large amounts of data and remains inefficient with unapparent traffic patterns. The functional class grouping, a traditional method, also produces larger …