Open Access. Powered by Scholars. Published by Universities.®

Civil and Environmental Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

2023

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 91 - 120 of 1745

Full-Text Articles in Civil and Environmental Engineering

Utilization Of Biomimetic Molecules To Control The Carbonation Of Cementitious Phases, Muhammad Intesarul Haque Dec 2023

Utilization Of Biomimetic Molecules To Control The Carbonation Of Cementitious Phases, Muhammad Intesarul Haque

Civil Engineering Dissertations - Archive

This study introduces an innovative approach to mitigate carbonation-induced degradation of C-S-H and to enhance the carbonation properties of low calcium based cementitious materials by utilizing specific biomimetic molecules. In this study, four different biomimetic molecules were utilized. Details about their chemical formula and chemical structure can be found in Chapter 1. The dissertation is broadly focused on two aspects, Part 1 (Chapter 2 and 3) evaluated the role of biomimetic molecules in reducing the carbonation degradation of C-S-H. Part 2 (Chapter 4 and 5) assessed the effectiveness of the biomimetic molecules as performance enhancing admixture of carbonation cured dicalcium …

Go to article

Experimental And Numerical Analyses Of Coupled Thermo-Hydro-Mechanical Behavior In Unsaturated Soil Under One-Dimensional Heat Transfer, Nice Kaneza Dec 2023

Experimental And Numerical Analyses Of Coupled Thermo-Hydro-Mechanical Behavior In Unsaturated Soil Under One-Dimensional Heat Transfer, Nice Kaneza

Civil Engineering Dissertations - Archive

Comprehension of the behavior of unsaturated soil in response to thermal gradients, moisture gradients, and deformation is important in geotechnics. Thermal gradients control fluid density and viscosity and moisture gradients alter thermal properties of unsaturated soil. Similarly, thermal gradients affect the thermal strain of unsaturated soil and changes in porosity influence hydraulic properties of the soil. Thus, thermal, hydraulic, and mechanical properties of unsaturated soil interact with and influence each other; the combination of these interactions form a mechanism called coupled thermo-hydro-mechanical (THM) processes. Although the study of the behavior of coupled THM processes is essential in predicting the performance …

Go to article

“Increasing Renewable Energy Potential Of Landfill Gas By Electrocatalytic Conversion Of Carbon Dioxide To Methane At Low Temperature.”, Asma Akter Rony Dec 2023

“Increasing Renewable Energy Potential Of Landfill Gas By Electrocatalytic Conversion Of Carbon Dioxide To Methane At Low Temperature.”, Asma Akter Rony

Civil Engineering Dissertations - Archive

The conversion of carbon dioxide into methane at a low temperature has great potential to reduce current international environmental issues like global warming and will create new sources of renewable energy. The overall goal of this research is to increase renewable energy production from landfill gas using an unconventional process – electrocatalytic methanation of carbon dioxide – which has not been implemented for landfill gas yet. The electrocatalytic methanation follows the Waseda process, which applies an electric field in the presence of a Ruthenium-supported cerium oxide (CeO2) catalyst. The specific objectives of this research were: 1. To explore the impact …

Go to article

Tri-Dimensional Segment-Based Urban Traffic Crash Models, Farzin Maniei Dec 2023

Tri-Dimensional Segment-Based Urban Traffic Crash Models, Farzin Maniei

Civil Engineering Dissertations - Archive

The continuous expansion of highway and freeway networks further exacerbates the risk of traffic crashes and highlights the critical importance of freeway safety management. To improve overall road safety, many organizations acknowledge the necessity of pinpointing locations experiencing higher-than-expected crashes (known as hotspot identification, HSID), identifying the factors contributing to traffic crashes, and determining the most effective preventive measures. Previous studies highlighted two major drawbacks associated with this approach: (1) HSID based on the total number of crashes can lead to incorrectly identifying hazardous areas; (2) the arbitrary selection of a fragment size (due to the lack of explicit recommendations) …

Go to article

Compound Flood Modeling Of Tropical Cyclone Events In Coastal Bays And Estuaries, Nahal Maymandi Dec 2023

Compound Flood Modeling Of Tropical Cyclone Events In Coastal Bays And Estuaries, Nahal Maymandi

Civil Engineering Dissertations - Archive

Flooding due to tropical cyclones can cause severe impacts on coastal communities, particularly when multiple types of flooding (e.g., coastal and riverine) interact to create a compound flood event. In typical flood hazard assessments, these drivers of flooding are considered separately, even though they may interact and produce more severe flooding. Understanding the interactions between flood drivers is necessary to accurately plan for and respond to future flood events. This dissertation aims to improve the assessment of coupled coastal, fluvial, and pluvial flooding in coastal bays and estuaries impacted by tropical cyclones. To do this, a hydrodynamic model is developed …

Go to article

Statistical And Deep Learning Models For Reference Evapotranspiration Time Series Forecasting: A Comparison Of Accuracy, Complexity, And Data Efficiency, Arman Ahmadi, Andre Daccache, Mojtaba Sadegh, Richard L. Snyder Dec 2023

Statistical And Deep Learning Models For Reference Evapotranspiration Time Series Forecasting: A Comparison Of Accuracy, Complexity, And Data Efficiency, Arman Ahmadi, Andre Daccache, Mojtaba Sadegh, Richard L. Snyder

Civil Engineering Faculty Publications and Presentations

Reference evapotranspiration (ETo) is an essential variable in agricultural water resources management and irrigation scheduling. An accurate and reliable forecast of ETo facilitates effective decision-making in agriculture. Although numerous studies assessed various methodologies for ETo forecasting, an in-depth multi-dimensional analysis evaluating different aspects of these methodologies is missing. This study systematically evaluates the complexity, computational cost, data efficiency, and accuracy of ten models that have been used or could potentially be used for ETo forecasting. These models range from well-known statistical forecasting models like seasonal autoregressive integrated moving average (SARIMA) to state-of-the-art deep learning (DL) algorithms like temporal fusion transformer …

Go to article

Infrastructure Damage Detection Leveraging Advanced Ai Techniques, Yin Chao Wu Dec 2023

Infrastructure Damage Detection Leveraging Advanced Ai Techniques, Yin Chao Wu

Civil Engineering Dissertations - Archive

The dissertation explores into structural damage identification and prediction through the application of machine learning. Firstly, it enhances impact echo delamination mapping by incorporating two signal image parameters—signal duration and starting time after zero-crossing. The research also explores the efficiency of machine learning concerning image resolution and the number of images. This approach refines the evaluation of bridge damage in field tests. Two crucial signal parameters are investigated: signal duration and signal starting time after the zero-crossing point. These parameters exert a direct impact on the frequency domain, a crucial metric in impact echo analysis. This metric discerns signals reflected …

Go to article

Proactive Seismic Rehabilitation Decision-Making Model For Water Pipe Networks Under Network Uncertainties And Degradation, Abhijit Roy Dec 2023

Proactive Seismic Rehabilitation Decision-Making Model For Water Pipe Networks Under Network Uncertainties And Degradation, Abhijit Roy

Civil Engineering Dissertations - Archive

Past earthquakes have revealed that earthquakes disrupt the operations of underground water infrastructure systems. Assessment of the seismic vulnerability of underground water pipe networks plays a critical role in formulating preventive rehabilitation decision-making to ensure maximum serviceability after an earthquake event and avoid high repair costs. Although existing seismic vulnerability assessment methods and seismic rehabilitation decision-making models are sensitive to water pipe network uncertainties (e.g., uncertainties in nodal demand, reservoir head, and pipe roughness coefficient) and pipes’ degradation, the extent of the effects of the network uncertainties and pipes’ degradation on the postearthquake serviceability of the network and seismic rehabilitation …

Go to article

An Experimental And Numerical Study Of Utilizing Steel Fiber And Gfrp In Bridge Decks Under Bending, Sam Kafaji Dec 2023

An Experimental And Numerical Study Of Utilizing Steel Fiber And Gfrp In Bridge Decks Under Bending, Sam Kafaji

Civil Engineering Dissertations - Archive

The process of laying and tying conventional reinforcement is a time-consuming task when building a bridge deck, especially while ensuring the proper cover. To speed up the construction process, the bridge construction industry should look into replacing conventional reinforcing bars with steel fibers. This could be a significant breakthrough in bridge construction. Despite numerous experiments and research conducted on the bending strength of reinforced concrete decks, there are still several factors that require further exploration. This experiment focuses on utilizing steel fiber reinforced concrete (SFRC) in a multiple-span concrete bridge deck to investigate the opportunities of using SFRC as the …

Go to article

Condition Assessment Of Reinforced Concrete Sanitary Sewer Pipelines Using Probabilistic Methods And Advanced Inspection Tools, Moein Ebrahimi Dec 2023

Condition Assessment Of Reinforced Concrete Sanitary Sewer Pipelines Using Probabilistic Methods And Advanced Inspection Tools, Moein Ebrahimi

Civil Engineering Dissertations - Archive

Large sanitary sewer pipelines (SSPs) are the backbone of modern infrastructure. They carry wastewater from smaller lines to treatment plans; therefore, they are critical for public health and safety. According to the ASCE report card published in 2021, the condition rate of sanitary sewage networks in the United States is D+ (i.e., poor) (ASCE 2021). Therefore, frequent inspections of SSPs are crucial for performing a proper life cycle management strategy. New inspection technologies such as LiDAR have recently been employed for rapid condition assessment of SSPs. Because of the precision of LiDAR inspection data, it can not only measure hydraulic …

Go to article

Sea Level Rise And The Drivers Of Daily Water Levels In The Sacramento-San Joaquin Delta, H. Baranes, Steven Dykstra, D. A. Jay, S. A. Talke Dec 2023

Sea Level Rise And The Drivers Of Daily Water Levels In The Sacramento-San Joaquin Delta, H. Baranes, Steven Dykstra, D. A. Jay, S. A. Talke

Civil and Environmental Engineering Faculty Publications and Presentations

Water levels in deltas and estuaries vary on multiple timescales due to coastal, hydrologic, meteorologic, geologic, and anthropogenic factors. These diverse factors increase the uncertainty of, and may bias, relative sea level rise (RSLR) estimates. Here, we evaluate RSLR in San Francisco Bay and the Sacramento-San Joaquin Delta, USA by applying a physics-based, nonlinear regression to 50 tide gauges that determines the spatially varying controls on daily mean water level for water years 2004–2022. Results show that elevated river flow and pumping (99th percentile) raise water level up to 6 m and lower it up to 0.35 m, respectively, and …

Go to article

Drinking-Water Fluoridation As An Example Of The Nurse + Engineer Fostering Informed Decisions And Actions, Daniel B. Oerther, Sarah Oerther Dec 2023

Drinking-Water Fluoridation As An Example Of The Nurse + Engineer Fostering Informed Decisions And Actions, Daniel B. Oerther, Sarah Oerther

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

A Numerical Modeling Analysis Of The San Francisco Bay And Sacramento-San Joaquin Delta: Riverine, Tidal, And Wind Processes, Drake A. Abrahamsson Dec 2023

A Numerical Modeling Analysis Of The San Francisco Bay And Sacramento-San Joaquin Delta: Riverine, Tidal, And Wind Processes, Drake A. Abrahamsson

Master's Theses

The primary motivation of this study is to analyze the 1D-2DH hydrodynamic model of the San Francisco Bay and Sacramento-San Joaquin Delta (SFBD) outlined in Nederhoff et al. (2021). I compared model water level data to 70 tidal records from the National Oceanic and Atmospheric Association (NOAA), the United States Geological Survey (USGS), the California Data Exchange Center (CDEC), and from local municipalities throughout the Bay Area to investigate how the model captures water levels and tidal constituent amplitudes. While the Nederhoff et al (2017) model analyzed an extended time period from 1950-2019, I analyzed M2 amplitude and tidal water …

Go to article

Nanobubble Technology For The Removal Of Mib And Geosmin From Drinking Water, Meryem Soyluoglu Dec 2023

Nanobubble Technology For The Removal Of Mib And Geosmin From Drinking Water, Meryem Soyluoglu

All Dissertations

The presence of taste and odor (T&O) compounds in drinking water has been historically a major challenge for water utilities. They are difficult to remove using conventional water treatment processes, a combination of coagulation, flocculation, sedimentation, filtration, and chlorination. However, activated carbon (AC) adsorption, advanced oxidation processes, and biofiltration can be effective. The seasonal nature of T&O events makes it difficult to justify installing dedicated treatment technologies. Additionally, incorporating these technologies into existing water treatment plants can be expensive and require significant upgrades. Therefore, water utilities are always interested in exploring new approaches to minimize the occurrence and removal of …

Go to article

Performance Of Co2-Cured Alkali-Activated Slag Pastes During Curing And Exposure, Yubin Jun, Seong Ho Han, Jae Hong Kim Dec 2023

Performance Of Co2-Cured Alkali-Activated Slag Pastes During Curing And Exposure, Yubin Jun, Seong Ho Han, Jae Hong Kim

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This study investigated the efficiency of CO2 curing in blast-furnace slag pastes activated with three concentrations of KOH solution (3, 4, and 5 M). The CO2 curing was applied into the alkali-activated slag paste for 3 days. The CO2-cured pastes were subjected to subsequent curing in a water bath or exposed to seawater. The mechanical properties and characteristics of the reaction products were compared. Full strength can be obtained within 3 days of the early CO2 curing. The strength remained almost constant regardless of the activator concentration. The CO2-cured samples produced more CaCO …

Go to article

Effect Of Latex Modified Concrete Overlays With Reduced Surface Preparation On The Load Distribution And Flexural Strength Of Channel Girders, Samuel Dodd Dec 2023

Effect Of Latex Modified Concrete Overlays With Reduced Surface Preparation On The Load Distribution And Flexural Strength Of Channel Girders, Samuel Dodd

All Theses

This thesis investigates the use of a Latex Modified Concrete (LMC) overlay to increase the strength of prestressed channel girders and enhance their ability to distribute load. The research conducted in this thesis involved material testing of several different LMC mixes and flexural testing of an LMC overlay and girder system. The material testing was used to determine a reasonable LMC mix design and surface preparation method to be used for the overlay. Based on material testing it was concluded that a rapid-set mix and pressure washing of the girder surfaces were a reasonable mix design and surface preparation for …

Go to article

Co2 Storage Capacity And Injectivity Of Stacked Carbonates Of The Pennsylvanian And Permian In Western Nebraska, Lateef Lawal Dec 2023

Co2 Storage Capacity And Injectivity Of Stacked Carbonates Of The Pennsylvanian And Permian In Western Nebraska, Lateef Lawal

Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research

Geological carbon storage (GCS) is a critical aspect of carbon capture and storage (CCS) in which captured CO2 from power plants and industrial processes is injected and stored securely underground. Potential subsurface rock formations include saline aquifers, depleted oil and gas reservoirs, unmineable coal seams and volcanic rocks. GCS technology has been proven in the United States and many other parts of the world as a net-zero carbon emission strategy to mitigate the current climate crisis of our planet. Unlike other states such as Wyoming, GCS projects are still in the early phases in Nebraska. The goal of this …

Go to article

Evaluation Of The Long-Term Performance Of Ogfc In South Carolina, Rishiraj Brahmbhatt Dec 2023

Evaluation Of The Long-Term Performance Of Ogfc In South Carolina, Rishiraj Brahmbhatt

All Theses

Since the 1970s, South Carolina has employed open graded friction courses (OGFC) on high-speed asphalt roadways to enhance wet weather safety. While these mixes have indeed enhanced safety, they still grapple with durability issues, particularly concerning raveling. This research aimed to assess the prolonged performance of OGFC pavements in South Carolina, with a specific emphasis on isolated raveling occurrences. In 2012, the South Carolina Department of Transportation (SCDOT), constructed the first Warm Mix OGFC test section in South Carolina on I-20 Eastbound in Kershaw County, spanning 3.9 miles, using the Evotherm additive and excluding fibers. Following the success of this …

Go to article

Wastewater Treatment Plants: The Missing Link In Global One-Health Surveillance And Management Of Antibiotic Resistance, Abdolmajid Gholizadeh, Mehdi Khiadani, Maryam Foroughi, Hadi Alizade Siuki, Hadi Mehrfar Dec 2023

Wastewater Treatment Plants: The Missing Link In Global One-Health Surveillance And Management Of Antibiotic Resistance, Abdolmajid Gholizadeh, Mehdi Khiadani, Maryam Foroughi, Hadi Alizade Siuki, Hadi Mehrfar

Research outputs 2022 to 2026

Introduction: As a global public health crisis, antibiotic resistance (AR) should be monitored and managed under the One-Health concept according to the World Health Organization (WHO), considering the interconnection between humans, animals, and the environment. But this approach often remains focused on human health and rarely on the environment and its compartments, especially wastewater as the main AR receptor. Wastewater treatment plants (WWTPs) not only are not designed for reliving AR but also provide appropriate conditions for enhancing AR through different mechanisms. Methods: By reviewing the research-based statistics on the inclusion of WWTPs in the One-Health/AR program crisis, this paper …

Go to article

Capillary-Sealing Efficiency Of Mica-Proxy Caprock For Co2/H2 Geologic Storage In The Presence Of Organic Acids And Nanofluids, Amer Alanazi, Muhammad Ali, Mahmoud Mowafi, Saleh Bawazeer, Ziyad K K. Kaidar, Hussein Hoteit Dec 2023

Capillary-Sealing Efficiency Of Mica-Proxy Caprock For Co2/H2 Geologic Storage In The Presence Of Organic Acids And Nanofluids, Amer Alanazi, Muhammad Ali, Mahmoud Mowafi, Saleh Bawazeer, Ziyad K K. Kaidar, Hussein Hoteit

Research outputs 2022 to 2026

Toward a diversified low-carbon future, the geological storage of carbon dioxide (CO2) and hydrogen (H2) is regarded as a key enabler for an industrial-scale implementation. However, many geological formations, such as depleted oil and gas reservoirs, can contain inherent traces of organic molecules that dramatically affect their storage capacities and caprock sealing efficiency. Hence, using the right analysis to accurately determine the caprock sealing efficiency and storage capacity in the presence of organics is crucial for a secure and safe storage process. This study analyzed the sealing potential of a proxy caprock (mica) by calculating the capillary entry pressure and …

Go to article

Residual Trapping Of Co2, N2, And A Co2-N2 Mixture In Indiana Limestone Using Robust Nmr Coreflooding: Implications For Co2 Geological Storage, Amer Alanazi, Auby Baban, Muhammad Ali, Alireza Keshavarz, Stefan Iglauer, Hussein Hoteit Dec 2023

Residual Trapping Of Co2, N2, And A Co2-N2 Mixture In Indiana Limestone Using Robust Nmr Coreflooding: Implications For Co2 Geological Storage, Amer Alanazi, Auby Baban, Muhammad Ali, Alireza Keshavarz, Stefan Iglauer, Hussein Hoteit

Research outputs 2022 to 2026

Carbon capture and sequestration (CCS) in geological formations is a prominent solution for reducing anthropogenic carbon emissions and mitigating climate change. The capillary trapping of CO2 is a primary trapping mechanism governed by the pressure difference between the wetting and nonwetting phases in a porous rock, making the latter a key input parameter for dynamic simulation models. During the CCS operational process, however, the CO2 is prone to contamination by impurities from various sources such as surfaces (e.g., pipelines and tanks) and the subsurface (e.g., existing natural gas). Such contamination can strongly influence the overall CO2 wettability, storage capacity, and …

Go to article

A New Approach To Predicting Vertical Permeability For Carbonate Rocks In The Southern Mesopotamian Basin, Emad A. Al-Khdheeawi, Raed H. Allawi, Wisam I. Al-Rubaye, Stefan Iglauer Dec 2023

A New Approach To Predicting Vertical Permeability For Carbonate Rocks In The Southern Mesopotamian Basin, Emad A. Al-Khdheeawi, Raed H. Allawi, Wisam I. Al-Rubaye, Stefan Iglauer

Research outputs 2022 to 2026

Reservoir performance depends on many factors, and the most important one is permeability anisotropy. In addition, with high heterogeneity, it is essential to find unique relationships to predict permeability. Therefore, this study aims to predict vertical permeability based on horizontal permeability and porosity and to find new equations for carbonate reservoirs. This work relied on the 398 measured points of cores data collected from several wells in carbonate reservoirs. A new correlation for predicting vertical permeability for the whole data (369 samples) as a function of horizontal permeability and porosity has been developed. The results indicate that this new correlation …

Go to article

Development Of Scope Of Services For Procurement Of Professional Consultant Services On Transportation Projects – A Study Of South Carolina Department Of Transportation, Ajay Jadhav Dec 2023

Development Of Scope Of Services For Procurement Of Professional Consultant Services On Transportation Projects – A Study Of South Carolina Department Of Transportation, Ajay Jadhav

All Dissertations

Project Scoping Process (PSP) is one of the significant steps that starts at the very beginning of the project life cycle. During project initiation phase, project scoping is kicked off which includes documenting a list of project-specific goals, deliverables, tasks, costs, and deadlines. The scoping phase duration depends on the project complexity and involves various stakeholders, establishing team, confirming the project purpose and need, initiating the environmental revie process, determining the level of environmental documentation and permit requirements, conducting survey, identifying project risks and tools to mitigate them, and evaluating public involvement strategies. A well-defined PSP is therefore essential for …

Go to article

Risk Assessment Of Reinforced Concrete Sewer Pipes Under External Loading And Adverse Environmental Conditions Using An Adaptive Neuro-Fuzzy System, Khaled Saleh Khaled Abuhishmeh Dec 2023

Risk Assessment Of Reinforced Concrete Sewer Pipes Under External Loading And Adverse Environmental Conditions Using An Adaptive Neuro-Fuzzy System, Khaled Saleh Khaled Abuhishmeh

Civil Engineering Dissertations - Archive

Failure of sewer mains poses a significant threat to the society, necessitating a robust risk assessment tool that integrates failure likelihood and associated consequences for effective prioritization of mitigation efforts. This dissertation addresses this need through three key objectives: 1. Failure Likelihood Assessment: The study utilizes Monte-Carlo simulation to evaluate the probability of sewer main failures in common agressive environments, considering factors like sulfide and chloride exposures. It highlights that chloride-induced cracks and bond strength loss are more critical than sulfide-induced wall thickness loss. The degradation of concrete and reinforcement properties under chloride attack significantly reduces ductility, emphasizing the importance …

Go to article

Experimental Investigation Of Anchor Edge Distance Effects On Concrete Breakout Strength Within Frc, Ahmed Shlash Dec 2023

Experimental Investigation Of Anchor Edge Distance Effects On Concrete Breakout Strength Within Frc, Ahmed Shlash

Civil Engineering Theses - Archive

This research investigates the effect of edge on concrete breakout strength within steel fiber reinforced concrete (SFRC) under pure tension load. Single and group sets of anchors with high-strength steel-headed studs type (F1554 Grade 105) were cast in place within concrete specimens of different amounts of steel fibers and varied edge distances. Steel fibers were used in three percentages (0%, 0.5%, and 1%) by a weight-volume fraction of the mixture to produce three types of concrete mix designs in the lab. The physical and mechanical properties of steel fibers concrete were calculated and measured by testing specimens at the Civil …

Go to article

Developing A Geospatial Web Application For Transportation Geotechnical Asset Management, Ayoub Mohammadi Dec 2023

Developing A Geospatial Web Application For Transportation Geotechnical Asset Management, Ayoub Mohammadi

Civil Engineering Theses - Archive

Spatial data has become an increasingly important tool in geotechnical engineering, allowing for managing and analyzing large amounts of spatial data. In recent years, there has been a growing interest in developing applications that can be accessed by geotechnical engineers from anywhere with an internet connection. This thesis provides a comprehensive overview of the current state of the art in transportation earth structure management. It also highlights the potential benefits of these applications for geotechnical engineers, including open-source applications, database management, and user interface design. It identifies areas for future research and development. The research also discusses the various types …

Go to article

Vehicle-Bridge Interaction Simulation And Damage Identification Of A Bridge Using Responses Measured In A Passing Vehicle By Empirical Mode Decomposition Method, Shohel Rana, Md. Rifat Zaman, Md. Ibrahim Islam Ifty, Seyedali Mirmotalebi, Tahsin Tareque Dec 2023

Vehicle-Bridge Interaction Simulation And Damage Identification Of A Bridge Using Responses Measured In A Passing Vehicle By Empirical Mode Decomposition Method, Shohel Rana, Md. Rifat Zaman, Md. Ibrahim Islam Ifty, Seyedali Mirmotalebi, Tahsin Tareque

Civil Engineering Faculty Publications

To prevent early bridge failures, effective Structural Health Monitoring (SHM) is vital. Vibration-based damage assessment is a powerful tool in this regard, as it relies on changes in a structure’s dynamic characteristics as it degrades. By measuring the vibration response of a bridge due to passing vehicles, this approach can identify potential structural damage. This dissertation introduces a novel technique grounded in Vehicle-Bridge Interaction (VBI) to evaluate bridge health. It aims to detect damage by analyzing the response of passing vehicles, taking into account VBI. The theoretical foundation of this method begins with representing the bridge’s superstructure using a Finite …

Go to article

Post-Wildfire Export Regimes Of Solutes Along The Gallinas-Pecos River-Santa Rosa Fluvial Network, Asmita Kaphle Dec 2023

Post-Wildfire Export Regimes Of Solutes Along The Gallinas-Pecos River-Santa Rosa Fluvial Network, Asmita Kaphle

Civil Engineering ETDs

Wildfires significantly contribute to water pollution when ash and sediments, including nutrients and metals, are released into fluvial systems, impacting aquatic ecosystems and surrounding communities. This study focuses on the impacts of the Hermits Peak-Calf Canyon Fire on the Gallinas and Pecos watersheds. It employs five monitoring stations along a 190km fluvial network to assess solute export regimes post-fire, where grab samples were collected for nutrient and metal analyses for a period of more than a year. The metrics used for characterizing mobilization, chemostatic, or dilution patterns indicated mobilization for most solutes at all sites upstream of Santa Rosa Lake. …

Go to article

Structural Performance And Resiliency Of Reinforced Concrete Bridge Pier Columns, Multi-Column Piers, And Bridge Systems Subjected To Multiple Hazards – Fire, Collision, And Air Blast, Qusai Abdulkarim Alomari Dec 2023

Structural Performance And Resiliency Of Reinforced Concrete Bridge Pier Columns, Multi-Column Piers, And Bridge Systems Subjected To Multiple Hazards – Fire, Collision, And Air Blast, Qusai Abdulkarim Alomari

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Given their close proximity to traffic and improper employment of protective systems, bridges and bridge piers are vulnerable to multi-hazard events triggered by vehicle collisions coupled with correlated and cascading events, such as explosions and fires. Despite recent catastrophic incidents that have highlighted the profound consequences of these extreme demands, including substantial damage, adverse economic impact, and loss of life, there has been a notable lack of research investigating the performance of bridges and bridge structural components under the aforementioned multi-hazards. Furthermore, current bridge design codes do not address these events assuming that, after these destructive events, replacement of the …

Go to article

Analysis Of Travel Behavior At International Border Crossings: Application Of Travel Surveys, Jennifer Areli Moreno Escamilla Dec 2023

Analysis Of Travel Behavior At International Border Crossings: Application Of Travel Surveys, Jennifer Areli Moreno Escamilla

Open Access Theses & Dissertations

Transportation planning provides an insight into the demand and traffic distribution of existingconditions of a region and helps identify future transportation needs. The results generated from forecasting models influence many decisions on the selection of transportation projects and funding allocations. Thus, forecasting models require up-to-date trip information to represent trip patterns and generate representative traffic demand analysis in a such complex areas as binational regions. The purpose of this study is to provide an analysis on travel survey methodology applied to collect trip information at international border crossings. Based on the results of the survey, an analysis on trip pattern …

Go to article

First Prev Next Last