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Articles 361 - 390 of 677
Full-Text Articles in Civil Engineering
Structural Retrofit Of Reinforced Concrete Circular Columns Using Cfrp, Ahmed Haider Mohiuddin
Structural Retrofit Of Reinforced Concrete Circular Columns Using Cfrp, Ahmed Haider Mohiuddin
Civil Engineering Theses - Archive
Fiber reinforced polymer (FRP) composites have developed numerous applications in the field of Civil Engineering, mostly because of their beneficial properties like high strength-to=weight ratio and high corrosion resistance. This study presents an easy and expedient finite element (FE) able to accurately estimate the axial load carrying capacity of reinforced concrete (RC) circular columns confined with externally bonded carbon fiber reinforced polymer (CFRP) sheets. The element is able to model collapse due to concrete crushing. The FE generated in this study is used the load carrying capacity of CFRP confined RC columns subjected to concentric loading. Constitutive models for materials …
Sustainability Assessment Of Recycled Asphalt Mixtures In Texas, Reza Saeedzadeh
Sustainability Assessment Of Recycled Asphalt Mixtures In Texas, Reza Saeedzadeh
Civil Engineering Dissertations - Archive
The pavement practitioners use more recycled materials in asphalt mixtures in order to compensate for the high price of petroleum products and save the limited resources of virgin materials. Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS) have been in wide use in asphalt mixtures for several decades. Public perception on the utilization of recycled materials is that the mixtures become more cost effective and more environmental friendly. This is true when the initial stage of construction of pavements is assessed. However, a mixture that costs less and/or burdens the environment less at the beginning may require more frequent …
Design And Resistance Factor Calibration Of Pipe Piles In California, Yujie Hu
Design And Resistance Factor Calibration Of Pipe Piles In California, Yujie Hu
Civil Engineering Theses - Archive
Steel pipe piles, either open ended or close ended, are widely used in the state of California as bridge foundations due to high load bearing capacity, light weight, and outstanding workability. The design methods currently used by Caltrans were developed based on limited field data and are lack of field validations of the recent development of steel pipe piles. In this thesis study, 45 high quality steel pipe pile load tests performed in various soil conditions were collected from Caltrans’ load test data to evaluate available design methods and calibrate the resistance factors of selected design methods. A total of …
Potential Application Of Ultra-High Performance Fiber-Reinforced Concrete With Wet-Mix Shotcrete System In Tunneling, Jean Gamarra
Potential Application Of Ultra-High Performance Fiber-Reinforced Concrete With Wet-Mix Shotcrete System In Tunneling, Jean Gamarra
Civil Engineering Theses - Archive
In the tunneling industry, shotcrete has been used for several decades. The use of shotcrete or wet-mix spray-on methods allows the application of this method in complex underground profiles and shapes. The need for time efficient spraying methods and constructability for lining coverage opens the door for technologies like steel and synthetic fiber reinforced shotcrete to achieve a uniform and a good quality product. An important advantage of the application of fiber reinforced concrete in shotcrete systems for tunneling is that almost no steel fixing is required. This leads to several other advantages including safer working conditions during excavation, less …
Strengthening Of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (Cfrp), Tariq Al Jaafreh
Strengthening Of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (Cfrp), Tariq Al Jaafreh
Civil Engineering Dissertations - Archive
This research aimed to investigate the effect of utilizing “Fiber Reinforced Polymer” (FRP) on the light weight concrete beams. The main hypothesis is that such utilization of the FRP will lead to strengthened lightweight beams. The research that has been done on this relationship is somewhat broad in the scope and have mostly focused on the normal-weight concrete. However, only few studies that have considered the light weight concrete. Eight Beams were tested in this research under four point bending test. Two beams were taken as a control beams without any external bonding of Carbon Fiber Reinforced polymer. Another two …
Comparison Of Construction Methods For Building An Underground Freight Transportation In Texas, Niloofar Rezaei
Comparison Of Construction Methods For Building An Underground Freight Transportation In Texas, Niloofar Rezaei
Civil Engineering Theses - Archive
Freight transportation by trucks constitutes approximately 80% of total freight transportation in Texas and it is expected to approximately double by the year 2040. Social and environmental costs are adverse impacts of moving freights by trucks. Underground Freight Transportation (UFT) significantly reduces these negative impacts and is more sustainable method of freight transportation. UFT includes close-fitting vehicles carrying freight through underground pipelines or tunnels between terminals. The main objective of this research is to compare two construction methods: (1) tunneling using tunnel boring machine (TBM) and (2) tunneling using open-cut. To conduct this research, a comprehensive literature search on various …
Enhancing Productivity By Using Building Information Modeling Applications In Pipeline Construction Projects, Harsha Vardhan Reddy Guduru Penusila
Enhancing Productivity By Using Building Information Modeling Applications In Pipeline Construction Projects, Harsha Vardhan Reddy Guduru Penusila
Civil Engineering Theses - Archive
Building Information Modeling (BIM) is a technology and associated set of processes to produce, communicate, and analyze building models. BIM is a new concept within the construction industry. The objective of this thesis is to utilize BIM in pipeline construction projects as one of the pioneering steps to reduce rework and delays due to unforeseen conditions. This thesis presents evaluation and recommendations to help pipeline construction industry’s transition from traditional two-dimensional drawings to a BIM management process aiding owners and contractors to develop and implement a basic form of BIM technique to manage their projects. This thesis uses two pipeline …
Enhanced Seismic Performance Of Special Truss Moment Frames And Staggered Truss Framing System For Seismically Active Areas, Sanputt Simasathien
Enhanced Seismic Performance Of Special Truss Moment Frames And Staggered Truss Framing System For Seismically Active Areas, Sanputt Simasathien
Civil Engineering Dissertations - Archive
Due to their ability to achieve large column-free floor spaces, special truss moment frames (STMFs) and staggered truss frames (STFs) are unique valuable options for structural engineers. However, although STMFs and STFs offer a wide range of structural, architectural, and economical benefits, limited research data is available on the seismic performance of these systems. STMF system is a relatively new type of steel framing system for use in high seismic areas. STMFs dissipate earthquake energy through ductile special segments located near the mid-span of the truss girders, while the other members outside the special segment, including truss members, columns, and …
Investigation Of Strength-Enhancement Mechanism And Size Effect On Ultimate Shear Strength Of Steel Fiber-Reinforced Concrete (Sfrc) Slender Beams, Mohammad Reza Zarrinpour
Investigation Of Strength-Enhancement Mechanism And Size Effect On Ultimate Shear Strength Of Steel Fiber-Reinforced Concrete (Sfrc) Slender Beams, Mohammad Reza Zarrinpour
Civil Engineering Dissertations - Archive
This research study consists of two separate phases. In the first phase, an experimental study was conducted to identify the shear-enhancement and failure mechanisms behind the ultimate shear strength of steel fiber-reinforced concrete (SFRC) slender beams by utilizing the full field deformation measuring capability of digital image correlation (DIC) technology. A total of 12 large-scale simply supported SFRC and RC beams with a range of heights including 12 in. (305 mm), 18 in. (457 mm), 24 in. (610 mm), 36 in. (915 mm), and 48 in. (1220 mm) were tested under monotonic point load. The greater shear strength in SFRC …
Effect Of Turbulence And Roughness On Coupled Porous-Medium/Free-Flow Exchange Processes, Thomas Fetzer, Kathleen M. Smits, Rainer Helmig
Effect Of Turbulence And Roughness On Coupled Porous-Medium/Free-Flow Exchange Processes, Thomas Fetzer, Kathleen M. Smits, Rainer Helmig
Civil Engineering Faculty Publications - Archive
The interactions between turbulent free flow and flow in a porous medium are of key interest in different fields, e.g., meteorology, agriculture, building physics, and aerospace engineering. Properly understanding the strongly coupled exchange processes between the two domains is crucial to describing these interactions. In (Mosthaf et al. in Water Resources Research 47(10):W10522, 2011. doi:10.1029/2011WR010685), a concept for coupling laminar compositional single-phase free flow to compositional two-phase porous-medium flow under non-isothermal conditions was presented. In this study, the existing coupling concept is first extended to turbulent free-flow conditions. This includes the interface conditions between a Reynolds-averaged Navier–Stokes free flow using …
Improving Water Quality Forecasting Using Data Assimilation, Hamideh Riazi
Improving Water Quality Forecasting Using Data Assimilation, Hamideh Riazi
Civil Engineering Dissertations - Archive
Population growth increases agricultural, industrial and human activities which threaten the quality of water resources, especially water supply sources such as lakes and reservoirs. In potentially high-impact situations such as algal blooms, active measures such as controlled release from reservoirs may be necessary. To minimize release while meeting the water quality requirements, accurate short-range water quality forecast is necessary. Because watershed water quality models have a large number of state variables most of which are never observed, their initial conditions (IC) are subject to large uncertainties which may propagate into large forecast errors. In this research, a data assimilation (DA) …
Landfill Volume Gain From The Diversion Of Construction And Demolition Waste, Aayush Raj Tiwary
Landfill Volume Gain From The Diversion Of Construction And Demolition Waste, Aayush Raj Tiwary
Civil Engineering Theses - Archive
Construction and Demolition (C&D) waste is one of the major components of the solid waste and is defined as a waste stream resulting from the construction, renovation and demolition of structures such as buildings, roads, and bridges. The amount of C&D waste has been in an upsurge with rapid growth in construction works and is expected to grow even more. As such, the effective waste management for C&D disposal has been a global issue owing to the increasing construction works worldwide. Although landfill disposal of C&D waste is not the preferred method of the C&D waste management, a significant portion …
Estimation Of Rebar Corrosion In Concrete Using Ground Penetrating Radar, Rakesh Krishnarajapete Raju
Estimation Of Rebar Corrosion In Concrete Using Ground Penetrating Radar, Rakesh Krishnarajapete Raju
Civil Engineering Theses - Archive
The purpose of this research was to quantitatively relate the amount of rebar corrosion in concrete with the amplitude of electromagnetic waves generated from Ground penetrating radar (GPR). Many studies have been undertaken on qualitative measurement of corrosion, but there are very few studies regarding estimation of rebar corrosion quantitatively. This experiment involved the use of accelerated corrosion by impressed current technique to corrode the rebar inside the concrete and GPR to determine the extent of corrosion, while making a comparison with a stainless steel bar which was used as a cathode to create a galvanic cell action. Rebars were …
Improving The Rainfall And Flood Frequency Analyses Using Stochastic Storm Transposition Method, Morteza Kiani
Improving The Rainfall And Flood Frequency Analyses Using Stochastic Storm Transposition Method, Morteza Kiani
Civil Engineering Theses - Archive
Reproduction and realization of historical rainfall events provides foundations for flood and rainfall frequency analyses and the advancement of meteorological studies. Stochastic storm transposition (SST) is a method for such a purpose and enables us to perform frequency analyses by transposing observed historical storm events over any given watershed. The goal of this study is to stochastically examine the impacts of extreme events on all locations in a homogeneity zone. Storms with the same probability of occurrence on a defined homogenous neighborhood will generate various impacts due to spatial and temporal variations of the storms. Transposing storms occurring in the …
Slope Stabilization And Performance Monitoring Of I-35 And Sh-183 Slopes Using Recycled Plastic Pins, Sandip Tamrakar
Slope Stabilization And Performance Monitoring Of I-35 And Sh-183 Slopes Using Recycled Plastic Pins, Sandip Tamrakar
Civil Engineering Theses - Archive
The United States earth retaining structure market exceeds 170 million square feet annually and there are over 50 different retaining systems to select from which are unique in design and construction. Depending on the type of retaining structure, unit costs vary from less than $20 to in excess of $250 per square foot. Selecting the technically appropriate and cost-effective system is often critical to project cost and schedule. The Recycled Plastic Pin (RPP) has potential to be utilized as a sustainable and cost effective option to stabilize the surficial slope failure. RPP have been successfully used in Missouri, Iowa and …
Experimental Study On Seismic Performance Of Reinforced Concrete Coupling Beams And Rectangular Squat Walls With Innovative Reinforcement Configurations, Poorya Hajyalikhani
Experimental Study On Seismic Performance Of Reinforced Concrete Coupling Beams And Rectangular Squat Walls With Innovative Reinforcement Configurations, Poorya Hajyalikhani
Civil Engineering Theses - Archive
Reinforced concrete core walls, coupled by diagonally reinforced coupling beams (DCBs), are a very efficient seismic force resisting system for medium- to high-rise buildings. The diagonal reinforcing bars in DCBs are most effective when the beam has a span-to-depth ratio, ln/h, less than 2. Modern construction, due to architectural requirements, typically requires span-to-depth ratios between 2.4 to 4, which leads to a very shallow angle of inclination of the diagonal reinforcement (generally between 10 to 20 degrees). The lower angles of inclination, combined with the detailing requirements specified in ACI 318, results in reinforcement congestion as well as design and …
Characterization And Comparison Of Fresh And Landfilled Solid Waste, Kavya Koganti
Characterization And Comparison Of Fresh And Landfilled Solid Waste, Kavya Koganti
Civil Engineering Theses - Archive
The understanding of the characteristics of Municipal Solid Waste (MSW) is very important in planning, designing and operating and/or upgrading the landfill operation system. It is well anticipated that the fresh MSW will be different from the landfilled MSW due to degradation. However, there is no systematic study on the comparison of physical properties of fresh and landfilled waste from bioreactor and/or enhanced leachate recirculated (ELR) landfills. The most important MSW properties to be considered while planning a landfill system are physical composition, moisture content, unit weight and volatile solids content. These properties are of particular interest especially when an …
Thermo-Hydro-Mechanical Behavior Of Unsaturated Clayey Soils Via Thermo/Suction-Controlled Ring Shear Testing, Jairo Edmundo Yepes Heredia
Thermo-Hydro-Mechanical Behavior Of Unsaturated Clayey Soils Via Thermo/Suction-Controlled Ring Shear Testing, Jairo Edmundo Yepes Heredia
Civil Engineering Dissertations - Archive
There is a lot of geotechnical infrastructure made of compacted soil, or resting on unsaturated ground, which 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 natural and engineered earth slopes, embankments, and soil bearing capacity, on the other hand, requires good estimations of shear strength, from peak to residual. Besides, despite the critical importance of the thermo-mechanical behavior of unsaturated soils in many geotechnical applications, the effect of relatively high temperature on shear strength and stiffness properties of unsaturated soils is not yet …
Medium-Range Ensemble Precipitation And Streamflow Forecasting For The Upper Trinity River Basin In Texas Via The Nws Hydrologic Ensemble Forecast Service, Hossein Sadeghi
Civil Engineering Theses - Archive
Compared to forecasts of short-term precipitation accumulations (daily or shorter) at lead times larger than a few days, those of longer-term accumulations (3-daily or longer) are significantly more skillful owing to the larger temporal scale of aggregation. If one can utilize this skill present in medium-range precipitation forecast in hydrologic prediction, it is very likely that the lead time of hydrologic forecasts, in particular, of streamflow and soil moisture may be extended. Though forecasts of longer-term accumulations of precipitation are more skillful than those of shorter-term accumulations, precipitation forecasts in general are too uncertain to be used as deterministic, or …
Feasibility Of Underground Freight Transportation (Uft) In Texas, Seyedeh Hosna Mousavipour
Feasibility Of Underground Freight Transportation (Uft) In Texas, Seyedeh Hosna Mousavipour
Civil Engineering Theses - Archive
The U.S. economy is expected to double in size over the next 30 years. Truck and rail freight traffic is expected to increase by approximately 45 percent. Air freight is expected to triple in response to demand for the rapid movement of high-value merchandise, while multimodal shipments will likely double. Texas with a gross state product (GSP) of $1.4 trillion dollars is the second largest economy in the U.S. Its size and population, central location, Gulf coastline, and energy resources require a reliable freight transportation system to facilitate further growth. This thesis focuses on the feasibility of Underground Freight Transportation …
Merging Radar-Only Qpe And Rain Gauge Data Via Conditional Bias-Penalized Optimal Estimation, Beomgeun Kim
Merging Radar-Only Qpe And Rain Gauge Data Via Conditional Bias-Penalized Optimal Estimation, Beomgeun Kim
Civil Engineering Theses - Archive
A new technique for merging radar precipitation estimates and rain gauge data is developed and evaluated to improve multisensor quantitative precipitation estimation (QPE). Various types of linear and nonlinear techniques have been used to combine rain gauge and radar data. Linear cokriging and its variants, for example, may be considered as the best linear unbiased estimators which minimize the error variance in the unconditional sense. They are, however, subject to conditional biases (CB) that may be unacceptably large for estimation of heavy-to-extreme precipitation. In this work, I develop, apply, and evaluate conditional bias-penalized cokriging (CBPCK) for spatial estimation of precipitation …
Enhanced Shrinkage Characterization Of Clayey Soils, Raju Acharya
Enhanced Shrinkage Characterization Of Clayey Soils, Raju Acharya
Civil Engineering Dissertations - Archive
Surficial slope failure is a common problem experienced by most of the compacted earth dams in Texas and several other southern states in USA as a result of desiccation or shrinkage induced cracking of the surficial soils. Cracking of the soil occurs when the tensile stress exceeds the tensile strength during drying process. Tensile stress increases with an increase in shrinkage strain and thus soil chemical admixtures can reduce the tensile stress by reducing the shrinkage potential of soil. Inclusion of such admixtures invariably affects the tensile strength. Yet there are not many test methods that could be utilized for …
Comprehensive Neural Network Forecasting System For Ground Level Ozone In Multiple Regions, Gautam Raghavendra Eapi
Comprehensive Neural Network Forecasting System For Ground Level Ozone In Multiple Regions, Gautam Raghavendra Eapi
Civil Engineering Dissertations - Archive
A comprehensive neural network daily maximum 8 hour-ozone forecasting model was developed based on five years of data (2010-2014) collected from 50 monitoring sites from the Dallas Fort Worth, Houston-Galveston-Brazoria, Los Angeles, San Joaquin and San Diego regions. This work represents the first neural network developed to forecast ozone in multiple regions, as well as multiple sites in the same region. Previous studies have developed separate neural network models to forecast ozone at each location. Two stages of feature selection were applied to reduce input vector dimension and redundancy. These are Piecewise Linear Orthonormal Floating Search (PLOFS), and Karhunen - …
Continuum-Scale Investigation Of Evaporation From Bare Soil Under Different Boundary And Initial Conditions: An Evaluation Of Nonequilibrium Phase Change, Andrew C. Trautz, Kathleen M. Smits, Abdullah Cihan
Continuum-Scale Investigation Of Evaporation From Bare Soil Under Different Boundary And Initial Conditions: An Evaluation Of Nonequilibrium Phase Change, Andrew C. Trautz, Kathleen M. Smits, Abdullah Cihan
Civil Engineering Faculty Publications - Archive
Evaporation and condensation in bare soils govern water and energy fluxes between the land and atmosphere. Phase change between liquid water and water vapor is commonly evaluated in soil hydrology using an assumption of instantaneous phase change (i.e., chemical equilibrium). Past experimental studies have shown that finite volatilization and condensation times can be observed under certain environmental conditions, thereby questioning the validity of this assumption. A comparison between equilibrium and nonequilibrium phase change modeling approaches showed that the latter is able to provide better estimates of evaporation, justifying the need for more research on this topic. Several formulations based on …
Exploring The Effects Of Atmospheric Forcings On Evaporation: Experimental Integration Of The Atmospheric Boundary Layer And Shallow Subsurface, Kathleen Smits, Victoria Eagen, Andrew Trautz
Exploring The Effects Of Atmospheric Forcings On Evaporation: Experimental Integration Of The Atmospheric Boundary Layer And Shallow Subsurface, Kathleen Smits, Victoria Eagen, Andrew Trautz
Civil Engineering Faculty Publications - Archive
Evaporation is directly influenced by the interactions between the atmosphere, land surface and soil subsurface. This work aims to experimentally study evaporation under various surface boundary conditions to improve our current understanding and characterization of this multiphase phenomenon as well as to validate numerical heat and mass transfer theories that couple Navier-Stokes flow in the atmosphere and Darcian flow in the porous media. Experimental data were collected using a unique soil tank apparatus interfaced with a small climate controlled wind tunnel. The experimental apparatus was instrumented with a suite of state of the art sensor technologies for the continuous and …
Feasibility Studies To Support Landfill Gas Recovery In Ghana, Neda Jangikhatoonabad
Feasibility Studies To Support Landfill Gas Recovery In Ghana, Neda Jangikhatoonabad
Civil Engineering Theses - Archive
According to World Bank Ghana generates 0.09 kg of solid waste per person per day, where there are only 4 engineered landfills in the country. In 2010, Ghana contributed to 0.13% of global greenhouse gases emissions, 10% of which was associated with waste sector. On the other hand, according to the World Bank in 2011, 39.5 % of Ghana’s population did not have access to electricity. Tapping landfill gas will not only provide portion of needed energy for the country, but will also help solve many of the environmental problems. Currently there is no landfill gas to energy project in …
Using Lean Techniques To Reduce Waste And Improve Performance In Municipal Project Delivery, Yasir E. Abdelrazig
Using Lean Techniques To Reduce Waste And Improve Performance In Municipal Project Delivery, Yasir E. Abdelrazig
Civil Engineering Theses - Archive
The basic concepts of lean thinking in construction projects are to reduce waste, improve communication, and promote teamwork integration through a common set of tools and techniques. With increased demand for public works projects, there is a need to focus attention on the efficient delivery of construction project services in the public sector, and in particular, on municipal project delivery. Performance improvements using lean techniques are considered to overcome problems, facilitate project progress, and offer recommendations for better municipal construction project processes. Municipal projects are a part of the public works which include a broad category of infrastructure projects, financed …
A Parametric Study Of The Effects Of Ɛ And ��̅ On The Poisson Boltzmann Equation For One And Two Spherical Particles Using A Boundary Integral Equation Method, Oumama H. Lingamfelter
A Parametric Study Of The Effects Of Ɛ And ��̅ On The Poisson Boltzmann Equation For One And Two Spherical Particles Using A Boundary Integral Equation Method, Oumama H. Lingamfelter
Civil Engineering Theses - Archive
Many biomolecules, such as DNA, exhibit properties that are dependent on their electrostatic interaction with an electrolytic solution. Both explicit atomistic and implicit continuum models have been developed to solve the electrostatic problem. The implicit models are based on the Poisson-Boltzmann (PB) equation, whose lower computational cost makes them favored for bio-molecular applications, particularly as the molecule size increases. Among the implicit models, a boundary integral equation (BIE) method involving only numerical treatment on a surface in turn is more efficient than domain-based finite element and finite difference methods. This is especially so in the present case where the electric …
Comparison Of Post-Tensioned Cast In Place Concrete And Steel-Concrete Composite Bent Caps, Francisco David Berrocal Ruiz
Comparison Of Post-Tensioned Cast In Place Concrete And Steel-Concrete Composite Bent Caps, Francisco David Berrocal Ruiz
Civil Engineering Theses - Archive
Civil engineering projects are conditioned not only by the technology available but also by resources availability as well as budget and construction time. Special conditions applicable to particular projects can also control their development.The correct selection from the different feasible alternatives can determine the final output of a project. In that sense, the importance of bridge structures on both the overall budget and schedule of civil engineering projects makes the selection of the proper structural typology decisive for their success or failure. In some cases, special characteristics can establish the need of innovative solutions to guarantee a successful development of …
Smart Speed Bumps, Mohammed Shakir Rajani
Smart Speed Bumps, Mohammed Shakir Rajani
Civil Engineering Theses - Archive
The research underscores the need and importance of traffic calming devices and provides the basis for designing and building a device for traffic calming in neighborhoods with high pedestrian traffic, particularly children. The thesis focuses on developing a traffic calming device that is responsive to driver behavior rather than a static traffic calming device. The design presented herein involves modifying conventional speed bumps used for calming traffic in areas with high pedestrian traffic. The relevant engineering issues that are addressed include:* The functional requirements of the overall system and each of the system components* Operational challenges* Testing framework for evaluating …