Organizational Unit:
College of Engineering

Permanent Link
https://hdl.handle.net/1853/70626
Research Organization Registry ID
Description
Previous Names
Parent Organization
Parent Organization
Includes Organization(s)
ArchiveSpace Name Record
https://finding-aids.library.gatech.edu/agents/corporate_entities/103

Filters

3911
Reset filters

Settings
search.filters.applied.f.isOrgUnitOfPublicationTitle: School of Civil and Environmental Engineering ×

Publication Search Results

Now showing 1 - 10 of 3911
  • No Thumbnail Available
    Item
    Construction 3D Printing Materials and Anisotropic Strength Properties
    (Georgia Institute of Technology, 2024) Bradford, Katy
    This database presents results from previous studies regarding the anisotropic properties of 3D-printed composite materials applicable to construction 3D printing with concrete 3D printers, and corresponding data for cast samples of the same mixture designs. The purpose of this dataset is to provide information regarding various types of applicable composite materials, including cements, clays, earth, and geopolymers, for the future development of low-carbon construction 3D printing assemblies.
  • Thumbnail Image
    Item
    Residual Deterrence In Action: Exploring The Impact Of License Plate Readers In Warner Robins' Smart City Digital Twin Model
    (Georgia Institute of Technology, 2023-12-13) Sonar, Nidhi Sandip
    With an emphasis on crime prevention, this thesis investigates the residual effect of License Plate Readers (LPRs) within a Smart City Digital Twin (SCDT) model. It highlights the integration of Artificial Intelligence (AI) and LPRs for improved surveillance while tracing the historical background of crime. The study presents the Warner Robins SCDT model, which shows encouraging outcomes in the use of dynamic LPR deployment to curb criminal acts. The residual effect of LPRs, which shows continued deterrence even after relocation, is analyzed using statistical tests on the crime records of Warner Robins (WR) and the location of cameras during the intervention period of eighteen weeks. The results demonstrate the presence of a residual effect for the period under consideration, and the possibility of yielding unique results or insights through advanced testing and research based on different parameters.
  • Thumbnail Image
    Item
    Accessibility To Healthcare Via Public Transit: A Case Study Of The Atlanta Metropolitan Area
    (Georgia Institute of Technology, 2023-12-12) Baral, Ivee
    Access to transportation is one of the major social determinants of health (SDOH). Environmental conditions where people are born, live, learn, work, play, worship, and age have an impact on a variety of health, functioning, and quality-of-life outcomes and risks; these conditions are known as social determinants of health (American Hospital Association, 2023). For households without cars, public transportation is essential for accessing healthcare (Liu et al., 2022). Adequate public transportation can help ensure patients are able to attend their healthcare appointments as scheduled and decrease the number of missed appointments. On the other hand, a lack of public transit could disrupt health outcomes by leading to delayed diagnoses or exacerbating existing conditions (American Hospital Association, 2023). Due to varying socioeconomic factors such as race, ethnicity, and car ridership, different households have unequal access to healthcare, so transit is their only way of reaching healthcare facilities (Liu et al., 2022). This study will investigate the accessibility of healthcare in the Atlanta Metropolitan Area via MARTA bus routes to understand how accessible healthcare is for transit-dependent individuals. Transit dependency constitutes individuals who have limited access to other modes of transportation, such as those above 65, below 18, and people with disabilities (American Public Transit Association, 2017). The goal of this study is to identify the census tracts in the study area that have limited access to healthcare facilities via transit, especially for transit-dependent people. The study will focus on the MARTA bus routes rather than the MARTA rail, as there is greater reach through the bus network.
  • Thumbnail Image
    Item
    An observational and modeling study of energy, water, and carbon transport in eco-hydro-meteorological systems
    (Georgia Institute of Technology, 2023-12-12) Zhu, Modi
    Eco-hydro-meteorological systems play a critical role in regulating the Earth's energy, water, and carbon cycles. Understanding the physical mechanisms driving ecosystem functioning is essential for predicting and mitigating the impacts of global environmental change. The primary objective of this study is to understand the complex mechanisms and interactions that govern the transport of energy, carbon, and water in various eco-hydro-meteorological systems. However, the mechanisms in different eco-hydro-meteorological systems are quite different. This study, by employing a blend of observational data and modeling techniques, investigates the physical transportation of energy, water, and carbon within diverse ecosystems --forest, permafrost, and lake --each with its distinct mechanisms, and develops a comprehensive understanding of how these ecosystems function and respond to environmental changes. In the observational phase, data is gathered using flux towers that measure the exchange of energy, water, and carbon between the Earth's surface and the atmosphere. Datasets from multiple flux towers across forest, permafrost, and lake ecosystems are scrutinized to discern patterns and drivers of eco-hydro-meteorological system processes. The observations have revealed the differences of how energy, water, and carbon are transported in different eco-hydro-meteorological systems and the importance of further study. In the modeling phase, the past traditional models of energy, water, and carbon transport of eco-hydro-meteorological systems have been carefully reviewed. The non-gradient models are widely applied in modeling the meteorological processes in recent decades. This study utilizes Maximum Entropy Production (MEP) Model and Half-order Derivative (HOD) Methods together with newly proposed inference models to simulate the eco-hydro-meteorological processes, which yielded consistent results compared to field experiments. Overall, this study has significant implications for our understanding of how eco-hydro-meteorological systems function and how they respond to environmental changes. The knowledge gained from this research could inform the development of policies and strategies to promote environmental sustainability and protect these vital ecosystems for future generations.
  • Thumbnail Image
    Item
    An observational and modeling study of energy, water, and carbon transport in eco-hydro-meteorological systems
    (Georgia Institute of Technology, 2023-12-11) Zhu, Modi
    Eco-hydro-meteorological systems play a critical role in regulating the Earth's energy, water, and carbon cycles. Understanding the physical mechanisms driving ecosystem functioning is essential for predicting and mitigating the impacts of global environmental change. The primary objective of this study is to understand the complex mechanisms and interactions that govern the transport of energy, carbon, and water in various eco-hydro-meteorological systems. However, the mechanisms in different eco-hydro-meteorological systems are quite different. This study, by employing a blend of observational data and modeling techniques, investigates the physical transportation of energy, water, and carbon within diverse ecosystems --forest, permafrost, and lake --each with its distinct mechanisms, and develops a comprehensive understanding of how these ecosystems function and respond to environmental changes. In the observational phase, data is gathered using flux towers that measure the exchange of energy, water, and carbon between the Earth's surface and the atmosphere. Datasets from multiple flux towers across forest, permafrost, and lake ecosystems are scrutinized to discern patterns and drivers of eco-hydro-meteorological system processes. The observations have revealed the differences of how energy, water, and carbon are transported in different eco-hydro-meteorological systems and the importance of further study. In the modeling phase, the past traditional models of energy, water, and carbon transport of eco-hydro-meteorological systems have been carefully reviewed. The non-gradient models are widely applied in modeling the meteorological processes in recent decades. This study utilizes Maximum Entropy Production (MEP) Model and Half-order Derivative (HOD) Methods together with newly proposed inference models to simulate the eco-hydro-meteorological processes, which yielded consistent results compared to field experiments. Overall, this study has significant implications for our understanding of how eco-hydro-meteorological systems function and how they respond to environmental changes. The knowledge gained from this research could inform the development of policies and strategies to promote environmental sustainability and protect these vital ecosystems for future generations.
  • Thumbnail Image
    Item
    Analysis Of Infrastructure Investments And Jobs Act, Federal Compliances, Issues And Determining A Framework Of Resources For Compliance Management
    (Georgia Institute of Technology, 2023-12-05) Aggarwal, Ayush
    The Infrastructure Investments and Jobs Act (IIJA) is a historic legislation bipartisan bill that has empowered the infrastructure development agencies with grants to undertake capital projects to meet the infrastructural needs of the USA. The study presents an analysis of the funding with around a fifth of the funding dedicated to the roads, bridges, and other major projects segment. The study sheds light on the tenets and objective of the government spending and also presents programs and grants available. It further elaborates on how these grants are classified as formula and discretionary and explains the fundamental differences in these granting methods. The study analyzes public data to determine the breakdown of the funding for the available formula grants. Chapter 3 of the study elaborates on the grant lifecycle to elaborate and educate the reader on the grant lifecycle from pre-award to post-award compliance requirements. The literature review and professional seminars indicated the lack of development of internal controls regarding federal compliance requirements by local public agencies and non-conventional grant recipients have hampered the agencies from accessing such funding opportunities. Therefore, this study highlights the major compliance areas required for federal participation in highway transportation construction projects. The study highlights the matrices published by the government for funding opportunities, and subsequently highlights the challenges with the compliance requirements. 5 challenges were recognized and subsequently 14 general compliance areas were identified for non-conventional entities to develop their internal controls and procedures. 11 federal compliance areas were identified where such compliance requirements might arise in the federally aided projects. These 11 areas are elaborated for the compliance requirements and subsequently chapter 8 provides tools and existing resources for development of such compliance requirements for the departments. Chapter 9 of the study recognizes 11 existing frameworks of resources that can be leveraged by the agencies for management of the federal compliance requirements. The summary of the existing frameworks like the USDOT Technical assistance programs and Local Technical Assistance programs will guide the readers toward the correct and relevant information regarding the compliance areas. Finally, this research while elaborating and highlighting federal compliance requirement management for the local public agencies highlights the need for a dynamic compliance navigator tool that integrates the available public resources by various organizations to streamline the federal compliances and enhance safety, quality and integrity of the project. The streamlined compliance navigator will aid the government in this massive undertaking of infrastructural development and deliver the projects On Time and on Budget.
  • Thumbnail Image
    Item
    Structural Testing Of Non-Proprietary UHPC For Closure Pours Used In Standard GDOT Precast Bridge Deck Panels
    (Georgia Institute of Technology, 2023-08-28) Ngeme, Lixrine Epie
    Ultra-high-performance concrete (UHPC) is a type of concrete that is known for its exceptional strength, durability, and resistance to cracking. Proprietary UHPC is primarily made by combining cement, silica fume, quartz flour, fine sand, high-range water reducers, and steel or polymer fibers. UHPC has been used in a variety of applications, including bridges, tunnels, high rise buildings, and other structures that require high strength and durability. One of the main advantages of UHPC is its ability to support high loads with relatively thin sections, which can lead to significant cost savings in construction. In 2018, researchers at the Georgia Institute of Technology developed a non-proprietary ultra-high-performance concrete (UHPC) mix that could be produced using locally available materials. The mix consisted of Portland cement, metakaolin, fine sand, water, and a high-range water reducer. The mix design demonstrates the required 28-day compressive strength of at least 18,000 psi. This UHPC mix was designed to meet the high-performance requirements of bridge construction while also being cost-effective and environmentally sustainable. The closure joint is a critical component of a bridge that accommodates the expansion and contraction of the bridge deck due to temperature changes. The UHPC mix was used to fill the closure joint between two adjacent bridge slabs. The performance of the UHPC mix in the closure joint was evaluated through a series of tests, including compression tests, and flexural tests. The UHPC mix was found to have high compressive and flexural strength, as well as excellent adhesion to the bridge decks. The primary goal for this research was to use the non-proprietary UHPC mix developed in the previous research at Georgia Institute of technology, to perform a large structural test on closure joint of bridge slabs in Georgia. Two tests were performed successfully and detailed reports from observing these tests followed. Insights were gained from these tests as to the viability of the non-proprietary mix for closure pour applications. The mix proved successful in this regard, indicated by both-large scale structural test specimens failing via crushing of the precast concrete panels rather than failure being governed by the UHPC joint. The results of the tests demonstrated that the non-proprietary UHPC mix developed in Georgia was a viable option for use in bridge construction. The UHPC mix showed superior performance compared to traditional concrete mixes and could provide a cost-effective and environmentally sustainable solution for bridge construction.
  • Thumbnail Image
    Item
    Experimental study on the nonlinear mixing of ultrasonic waves in concrete using array technique
    (Georgia Institute of Technology, 2023-08-21) Weiss, Fiona Jacqueline
    This research develops a procedure that combines array technology with non-collinear ultrasonic wave mixing to detect and scan internal microscale damage in a concrete prism specimen. By mixing two wave fronts of incident shear waves generated by two ultrasonic transducer arrays, one can exploit the underlying mechanics of nonlinear wave mixing to create a longitudinal mixed wave and measure the magnitude of this nonlinear wave at a frequency that is the sum of the fundamental frequencies. The frequency of the incident waves is chosen such that it is low enough to propagate without being scattered by the in- herently inhomogeneous concrete microstructure, while the resulting nonlinear phenomena are still sensitive to damage much smaller than the wavelength of the incident waves. The arrays enable beam steering, making it possible to scan for damage along an arc. Overall, scanning and imaging at different locations in a large volume throughout the specimen’s thickness is accomplished by manually adjusting the placement of the two arrays to move the mixing zone any desired, internal depth, while beam steering is used to scan at different locations of the same depth close to each other. The effectiveness of the proposed technique is demonstrated by characterizing different types of damage embedded at known locations in a concrete prism specimen. The results of this thesis are in accordance with previous research and show that beam steering along an arc to scan for damage in the concrete specimen is in fact possible.
  • Thumbnail Image
    Item
    Shaping The New Normal: The Role of Air Quality on Human Activities for Informed Decision Making
    (Georgia Institute of Technology, 2023-08-02) Xu, Lei
    Air pollution remains a complex global issue with severe societal and public health consequences. Despite extensive efforts, air quality policies in the United States have achieved limited success. The intricate relationship between human activities, transportation, and air quality has prompted academic and governmental efforts to adopt information policies, encouraging public involvement in transportation behavior changes and exploring the link between air pollution exposure and disease transmission. The significant shifts in transportation and public health, partly due to technological advancements and the COVID-19 pandemic, present an opportunity to investigate the influence of air quality and related policies on these societal changes. In this dissertation, I examine the role of air quality in shaping the "New Normal" by evaluating the impact of existing air quality policies on the adoption of micromobility and analyzing the potential contribution of air pollution to the spread of COVID-19. The first study explores the association between short-term air pollution exposure and COVID-19 infection rates in the U.S., aiming to raise awareness and inform decision-making for policymakers and the public. The second study assesses the effectiveness of air quality alerts on micromobility usage, examining public behavioral responses and evaluating policy success. The third study compares the spatiotemporal responses of micromobility and traditional driving to air quality information, analyzing potential replacement effects between these two transportation modes. Drawing from diverse fields such as air quality analytics, public policy, and public health, this research offers valuable insights and supports decision-making in the pursuit of a sustainable future. Amidst unprecedented changes and the potentially critical role of air pollution in reshaping daily life, this dissertation contributes to ongoing efforts to address air pollution and its complex societal implications.
  • Thumbnail Image
    Item
    Design, Construction and Testing of Pedestrian Bridges Built with Decommissioned 53-meter Wind Turbine Blades
    (Georgia Institute of Technology, 2023-08-01) Zhang, Zoe
    Due to the rise in popularity of wind energy in recent decades, projections show that millions of tons of glass-fiber reinforced polymer (GFRP) composite wind turbine blades will be decommissioned within the next 20-30 years, most of which will be landfilled or incinerated. The Re-Wind Network is a multinational research team focusing on this growing issue of blade waste, particularly on finding applications for decommissioned blades in infrastructure. This thesis focuses on the design, construction, and testing plan of an 18.5 meter pedestrian bridge made using decommissioned 53-meter blades. Two of these bridges, denoted as BladeBridges by the Re-Wind Network, will be installed in a public park in the City of Atlanta. This thesis presents the design and analysis of three bridge configurations that were considered for the BladeBridge, all of which use the wind blades as the primary longitudinal girders. The first option uses two blades with supports on either side of the span. The second option is a double-blade cantilever option, with both supports on one side of the span. The final option is a single-blade bridge, supporting the deck off to one side and placing the blade-girder into flexure and torsion. Structural analysis for each option is presented using effective moduli and section properties provided by the wind blade original equipment manufacturer (OEM), as well as load combinations specified by the AASHTO pedestrian bridge design code. Maximum stresses and deflections, as well as the constructability given the constrained site plan, were used to assess the feasibility of each option. The first option was chosen as the most feasible for the given bridge site, and further design details of the selected option are presented including overall elevations, foundation design, and steel connection design. Finally, a load testing and instrumentation setup plan is provided for a BladeBridge prototype that will be installed at the Georgia Tech Structural Engineering and Materials Laboratory.