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Articles 1 - 12 of 12
Full-Text Articles in Engineering
Evaluating Filter Materials For E. Coli Removal From Stormwater, Ghaem Hooshyari
Evaluating Filter Materials For E. Coli Removal From Stormwater, Ghaem Hooshyari
Electronic Theses and Dissertations
Stormwater runoff from agricultural and urban areas carries a wide range of pollutants and pathogens that can negatively affect surface water bodies and cause significant risks to the ecosystem and public health. Bacteria is one of the pollutants carried by stormwater, and Escherichia coli (E. coli) is commonly used as a microbial pollution indicator of surface water. The aim of this research was to investigate the removal of E. coli from stormwater using low-cost filter materials. Two industrial byproducts (steel slag and steel chips) and two natural minerals (zeolite and limestone) with three different sizes (0.5-1 mm, 1-2 mm, and …
Glulam Timber Bridges For Local Roads, Zachary Charles Carnahan
Glulam Timber Bridges For Local Roads, Zachary Charles Carnahan
Electronic Theses and Dissertations
The most common type of bridges on South Dakota (SD) local roads are prestressed precast double-tee bridges. Currently, there is only one double-tee girder manufacturer in South Dakota (SD). In an attempt to provide more bridge type selection options for local governments, a study was performed at South Dakota State University to investigate the feasibility and performance of new types of single-span bridges suitable for local loads with low traffic. In one part of the study, Mingo (2016) developed a fully precast bridge incorporating full-depth deck-panels and prestressed inverted bulb-tee girders. The study presented in this thesis was performed to …
Rehabilitation Of Longitudinal Joints In Double-Tee Girder Bridges, Lucas Michael Bohn
Rehabilitation Of Longitudinal Joints In Double-Tee Girder Bridges, Lucas Michael Bohn
Electronic Theses and Dissertations
Prefabricated bridge elements have become an essential part of accelerated bridge construction (ABC), which is an emerging technology to expedite bridge construction. Among several bridge girder types, precast double-tee girders are common on county bridges in South Dakota because of the ease of construction, the reduced construction time, and the potentially lower overall cost. However, the longitudinal joints of these bridges are rapidly deteriorating with many needing replacement before the expected 75- year service life. Research was conducted at South Dakota State University (SDSU) to develop, construct, and evaluate the performance of rehabilitation methods on this type of bridge. Current …
Identification, Calculation And Warning Of Horizontal Curves For Low-Volume Two-Lane Roadways Using Smartphone Sensors, Shaohu Zhang
Identification, Calculation And Warning Of Horizontal Curves For Low-Volume Two-Lane Roadways Using Smartphone Sensors, Shaohu Zhang
Electronic Theses and Dissertations
Smartphones and other portable personal devices that integrate global positioning systems, Bluetooth Low Energy, and advanced computing technologies have become more accessible due to affordable prices, product innovation, and people’s desire to be connected. As more people own these devices, there are greater opportunities for data acquisition in Intelligent Transportation Systems, and for vehicle-to-infrastructure communication. Horizontal curves are a common factor in the number of observed roadway crashes. Identifying locations and geometric characteristics of the horizontal curves plays a critical role in crash prediction and prevention, and timely curve warnings save lives. However, most states in the US face a …
Analysis Of Mechanical Properties Of Alternative Timber Beams For A Native American Earth Lodge, Freddy E. Moran
Analysis Of Mechanical Properties Of Alternative Timber Beams For A Native American Earth Lodge, Freddy E. Moran
Electronic Theses and Dissertations
To fill a gap in the literature, this thesis explored the mechanical properties for alternative roof beams of a historic Native American Hidatsa earth lodge. The research demonstrates that in those alternative beams, when Moisture Content (MC) increases, Modulus of Elasticity (E) decreases and deflection increases. The procedure included obtaining dimensions for alternative beams from scaled sketches created by ethnographers and informants who recorded an actual Hidatsa earth lodge in the early 1800s (confirmed by other sources) although no material properties studies have resulted. After calculating loads, the variations in the E were determined using an equation. Using linear analysis, …
Uav-Based Bridge Inspection And Computational Simulations, Luis Duque
Uav-Based Bridge Inspection And Computational Simulations, Luis Duque
Electronic Theses and Dissertations
The use of Unmanned Aerial Vehicles (UAV), commonly known as drones, has significantly increased in the field of civil engineering due to the poor condition of the United States’ infrastructure. The American Society of Civil Engineers (ASCE) recently reported that more than 9.1% of the United States’ bridges were structurally deficient and required attention and maintenance to ensure appropriate structural performance. Meanwhile, current practices are expensive and unsafe for bridge inspectors, requiring innovative and safer methods for the study of bridges. The goal of this paper was to identify better techniques to not only inspect, quantify, and determine the effect …
A Demonstration Study Of Drainage Water Management In Eastern South Dakota, Ashik Sahani
A Demonstration Study Of Drainage Water Management In Eastern South Dakota, Ashik Sahani
Electronic Theses and Dissertations
Subsurface drainage is a common water management practice for improving crop production in poorly drained soils; however, the practice is associated with several environmental concerns such as nutrient losses to downstream surface waters. These environmental concerns from subsurface drainage have prompted interest in drainage water management strategies such as controlled drainage. This study assessed the agronomic and environmental impacts of drainage water management in eastern South Dakota by using two demonstration plots for controlled and conventional drainage. Drain flow, nitrate and dissolved phosphorous concentration in drain water, shallow groundwater, crop yield, residual soil nitrate, soil moisture and temperature, soil penetration …
Evaluation Of Woodchip Bioreactor Denitrification Kinetics, Abdoul Aziz Kouanda
Evaluation Of Woodchip Bioreactor Denitrification Kinetics, Abdoul Aziz Kouanda
Electronic Theses and Dissertations
Agricultural subsurface drainage is a water management practice used to remove excess water in poorly drained soil. The use of fertilizers combined with subsurface drainage practice affects negatively surface water quality due to nutrient loss. Woodchip bioreactors have previously been used as a technology for removing nitrate from agricultural subsurface drainage. Understanding the mechanism that governs nitrate removal in woodchip bioreactors is crucial for field bioreactor design and application. The objective of this project is to determine woodchip bioreactor denitrification kinetics parameters under different operating conditions including hydraulic retention time, temperature and influent nitrate concentrations. Laboratory column experiments were conducted …
Effects Of Mechanical Bar Splices On Seismic Performance Of Reinforced Concrete Buildings, Abdullah Al Hashib
Effects Of Mechanical Bar Splices On Seismic Performance Of Reinforced Concrete Buildings, Abdullah Al Hashib
Electronic Theses and Dissertations
Mechanical bar splices, which are commonly referred to as couplers, are currently used in reinforced concrete structures to directly connect steel bars in lieu of conventional lap splicing. With proper detailing, couplers can be utilized to connect precast beams and columns to accelerate the construction. However, the experimental and analytical studies regarding their effect on the performance of RC moment-resisting frames (MRFs) are scarce. Current ACI 318 restricts the use of couplers in plastic hinge regions of special moment-resisting frames (SMRFs). Nevertheless, they can be incorporated at any location of the intermediate and ordinary MRFs. The seismic performance of RC …
Evaluating The Interactive Effects Of Traffic Volumes And Access Density On Crash Frequency, Ali Mohammed Alsubeai
Evaluating The Interactive Effects Of Traffic Volumes And Access Density On Crash Frequency, Ali Mohammed Alsubeai
Electronic Theses and Dissertations
Control of access points (e.g., driveway density) is an important consideration in roadway access management. Research has shown that by limiting the number of access points, there is a reduction in the number of conflict points along a roadway, resulting in improved safety. The effects of managing access points on crash frequency are documented as Crash Modification Factors/Functions (CMF) in the Highway Safety Manual (HSM) and the federal Highway Administration’s CMF Clearinghouse. The CMFs from the HSM indicate that the impacts of Access Density (AD) on crash frequency are a function of both AD and traffic volume (for rural roads). …
Impact Of Subsurface Drainage On Water Yield For Typical Soil And Weather In Eastern South Dakota, Govinda Karki
Impact Of Subsurface Drainage On Water Yield For Typical Soil And Weather In Eastern South Dakota, Govinda Karki
Electronic Theses and Dissertations
Subsurface drainage in agricultural land changes the field water balance by providing an alternate pathway for subsurface water. Determining the effects of subsurface drainage on downstream hydrology requires quantifying the components of the water balance. A number of studies have looked at the hydrological impacts of subsurface drainage. However, the effects are complex and difficult to generalize. The complex interaction involves the interrelation among variables such as soil type and properties, climate (rainfall and evapotranspiration), and drainage design configuration (drainage intensity and drainage coefficient), which all are local in nature. Additionally, most studies have been conducted in humid climates, whereas …
Monopile Foundation Offshore Wind Turbine Simulation And Retrofitting, William A. Schaffer
Monopile Foundation Offshore Wind Turbine Simulation And Retrofitting, William A. Schaffer
Electronic Theses and Dissertations
Offshore wind turbines (OWT) provide a renewable source of energy with great proximity to many large cities. This has caused a major increase in OWT development and implementation, primarily in Europe, but spreading throughout the world. There are a multitude of different foundation options, each with their own benefits. The most common types are: monopile, jacket, TLP, Semi-Submersible, and SPAR. The monopile foundation OWT has been proven to be the most economic selection for water depths up to approximately 25m. This thesis has analyzed strictly monopile foundations due to their previous success and popularity. Three different chapters have been created …