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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Calibration Of Iri-Based Psi Equation Using Updated Quarter-Car Parameters, Shirin Bahaaeldin Hassan
Calibration Of Iri-Based Psi Equation Using Updated Quarter-Car Parameters, Shirin Bahaaeldin Hassan
Graduate Theses, Dissertations, and Problem Reports
The international roughness index (IRI) was established in the 1980s and later used in generating the present serviceability index (PSI), which was developed to predict present serviceability rating (PSR). PSR is a measure of ride quality ratings made by a panel of highway users. The ratings range from 0 to 5, where “0” for very poor and “5” for very good. Various studies had formulated the relationship between IRI and PSI for different types of pavements, such as flexible, rigid, and composite pavements. The current IRI-based PSI equation being used among many state Departments of Transportation (DOTs) was proposed by …
Prioritization Framework For Advanced Systems Of Urban Roads In The Context Of Smart Cities, Jinwoong Lee
Prioritization Framework For Advanced Systems Of Urban Roads In The Context Of Smart Cities, Jinwoong Lee
Graduate Theses, Dissertations, and Problem Reports
The concept of a smart city has emerged as a solution to resolve various urban challenges by applying advanced systems for the functions of the city (e.g., environment, economy, infrastructure, governance, and people). Urban infrastructure with the use of modern technologies, such as Information Communication Technology and the Internet of Things, plays an essential role in enhancing the capability of the city to resolve the challenges. Particularly, urban roads supported by advanced systems with modern technologies serve as a principal bedrock to establish a smart city. Witnessing the benefits from intelligent urban roads has promoted city stakeholders to make investment …
A Parametric Study Of Lateral-Torsional Buckling In Pultruded Frp Beams Using Abaqus, Robert Nathaniel Baylor
A Parametric Study Of Lateral-Torsional Buckling In Pultruded Frp Beams Using Abaqus, Robert Nathaniel Baylor
Graduate Theses, Dissertations, and Problem Reports
Fiber Reinforced Polymer (FRP) composites continue to gain popularity in civil and mechanical infrastructure due to a high strength-to-weight ratio, corrosion-resistance, and low maintenance requirements. FRP can also fulfill niche roles requiring non-conductivity and magnetic transparency. The longitudinal forming of pultruded FRP makes it a natural choice for lightweight beams. Although FRP composites have a high strength for their weight, the elastic and shear moduli for glass FRP may only be 1/7 and 1/30 that of steel, respectively. These low stiffnesses make FRP composite beams particularly susceptible to lateral-torsional buckling (LTB). In addition, the low shear to elastic stiffness amplifies …
Review Of Forecasting Univariate Time-Series Data With Application To Water-Energy Nexus Studies & Proposal Of Parallel Hybrid Sarima-Ann Model, Cory Sumner Yarrington
Review Of Forecasting Univariate Time-Series Data With Application To Water-Energy Nexus Studies & Proposal Of Parallel Hybrid Sarima-Ann Model, Cory Sumner Yarrington
Graduate Theses, Dissertations, and Problem Reports
The necessary materials for most human activities are water and energy. Integrated analysis to accurately forecast water and energy consumption enables the implementation of efficient short and long-term resource management planning as well as expanding policy and research possibilities for the supportive infrastructure. However, the integral relationship between water and energy (water-energy nexus) poses a difficult problem for modeling. The accessibility and physical overlay of data sets related to water-energy nexus is another main issue for a reliable water-energy consumption forecast. The framework of urban metabolism (UM) uses several types of data to build a global view and highlight issues …
Identification Of Crash Contributing Factors In Av Involved Crashes, Md Tanvir Ashraf
Identification Of Crash Contributing Factors In Av Involved Crashes, Md Tanvir Ashraf
Graduate Theses, Dissertations, and Problem Reports
Autonomous Vehicles (AVs) can dramatically reduce the number of traffic crashes and associated fatalities by eliminating the avoidable human-errors related crash contributing factors. Many companies have been conducting pilot tests on public roads in several states in the United States and other countries to accelerate AV mass deployment. AV pilot operations on California public roads saw 251 AV-involved crashes (as of February 2020). These AV-involved crashes provide a unique opportunity to investigate AV crash risks in a mixed traffic environment. This study collected the AV crash reports from the California Department of Motor Vehicles and applied the Decision Tree (DT), …
Timber Bridge Pile Splicing With Fiber Reinforced Polymer Wraps, Drew L. Damich
Timber Bridge Pile Splicing With Fiber Reinforced Polymer Wraps, Drew L. Damich
Graduate Theses, Dissertations, and Problem Reports
Timber pile repair using splicing is widely used but little research has been done to determine their strength capacity after repair using this method. Current timber pile splicing mechanisms utilize various steel or wooden components. Fiber Reinforced Polymer (FRP) wraps can be utilized as replacement to conventional materials in splicing of timber piles. This study evaluated the strength capacities of traditional splicing mechanisms in relation to FRP wrap splice mechanisms. Traditional splicing mechanisms consisted of flat steel plate, C-channel steel plate, and wooden plate splices. The FRP wrap splice consisted of unidirectional glass/epoxy composite with three layers of fabric as …
Estimation And Mitigation Of Stresses In Mass Concrete Structures Containing Ground Granulated Blast Furnaceslag And Fly Ash, Guadalupe Leon
Estimation And Mitigation Of Stresses In Mass Concrete Structures Containing Ground Granulated Blast Furnaceslag And Fly Ash, Guadalupe Leon
Graduate Theses, Dissertations, and Problem Reports
In large concrete structures, due to concrete’s low thermal conductivity, the interior temperature rise can approach the concrete’s adiabatic temperature rise. As the concrete’s surface losses heat to the environment and cools rapidly, the interior of the concrete attempts to expand while the exterior provides an internal restraint. The phenomenon causes thermal stresses at the concrete’s surface. If the thermal stresses exceed the concrete’s tensile strength, there is a high probability of cracking. The cracks usually appear during the first few days after construction while the concrete’s tensile strength is low. These early-age cracks can reduce the service life of …
Effects Of Changes In Land Use Land Cover And Climate On Long-Term Total Dissolved Solids Trends In The Mid-Atlantic Region Of The United States, Melaine Edouard Kolimedje
Effects Of Changes In Land Use Land Cover And Climate On Long-Term Total Dissolved Solids Trends In The Mid-Atlantic Region Of The United States, Melaine Edouard Kolimedje
Graduate Theses, Dissertations, and Problem Reports
The Mid-Atlantic region (MAR) of the U.S. is subjected to a variety of stressors that affect the headwaters of the major rivers. Some of these stressors are abandoned mine drainage, agriculture, municipal point sources, urban areas, out-of-basin diversions, competing water uses, rapid population growths in the lowlands, alterations in water availability due to climate change and habitat alteration. In addition to these regional stressors, the rapid population growths and energy sources shifting have resulted in changes in land use and land cover (LULC) over the last few decades. The interactive effects of LULC and interannual/long-term climate changes have resulted in …
Nondestructive Condition Assessment Of Civil Infrastructure Using Ultrasonic Technique, Tyler Keith Ashbrook
Nondestructive Condition Assessment Of Civil Infrastructure Using Ultrasonic Technique, Tyler Keith Ashbrook
Graduate Theses, Dissertations, and Problem Reports
Civil Infrastructure controls the way people live by providing safe passage and shelter across the entire globe. Since safety leads the concern in infrastructure, it is essential to ensure that these structures have been adequately tested and analyzed periodically. Testing these structures can be extremely expensive when parts are required to be removed to capture the flaw, which is why nondestructive testing (NDT) continues to grow in demand since it can evaluate the structural component in-situ without causing any damage. Ultrasonic testing (UT) helps to adequately sustain and advance the safety in existing and future infrastructure across the globe. Continual …