Civil Engineering Commons^™

Exploring The Enablers And Barriers Of Stakeholder's Collaboration Of Maas Platform: A Case Study Of Bangkok, Sirawit Chinvanichai

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research investigates the implementation of Mobility as a Service (MaaS) to address fragmented transport services in Bangkok, focusing on identifying enablers, barriers, and concerns for MaaS adoption while quantifying evaluation criteria to determine the most suitable MaaS model. A mixed-methods approach was employed, beginning with a literature review to identify initial enablers and barriers, which were refined through expert meetings. Semi-structured interviews with 14 experts provided deeper insights into Bangkok’s transport context and potential MaaS models, while an AHP survey involving 12 experts quantified and prioritized the evaluation criteria. The findings highlight the roles and responsibilities of MaaS application …

การวิเคราะห์หาเวลาหยุดที่เหมาะสมของหุ้นกู้แปลงสภาพได้ในโครงสร้างพื้นฐานร่วมลงทุนระหว่างรัฐและเอกชน โดยใช้คอปูลา, สหัสวรรษ พาคำ

Chulalongkorn University Theses and Dissertations (Chula ETD)

ในอนาคตประเทศไทยจะมีโครงการร่วมลงทุนระหว่างรัฐและเอกชน (Public Private Partnership หรือ PPP) เกิดขึ้นในต่างจังหวัดเพิ่มมากขึ้น ทำให้นำมาซึ่งความเสี่ยงหลายด้าน เช่น ความเสี่ยงด้านจำนวนผู้ใช้บริการ ความเสี่ยงด้านรายได้จากการจัดเก็บค่าธรรมเนียม และความเสี่ยงด้านเงินกู้ เป็นต้น ส่งผลให้ภาคเอกชนขาดความมั่นใจเข้าร่วมลงทุนในโครงการ PPP ในต่างจังหวัด เพื่อแก้ปัญหาดังกล่าวภาครัฐต้องให้การสนับสนุนทางการเงินในโครงการ PPP ดังนั้น งานวิจัยนี้จึงมีจุดประสงค์เพื่อศึกษาการใช้เงินทุนชั้นลอยด้วยการใช้หุ้นกู้แปลงสภาพ (Convertible debenture) เป็นหุ้นกู้ที่ให้สิทธิหน่วยงานรัฐเป็นผู้ถือหุ้นในโครงสร้างเงินทุน ซึ่งเป็นรูปแบบการสนับสนุนทางการเงินใหม่ในโครงการ PPP และศึกษาสัดส่วนโครงสร้างเงินทุนที่เหมาะสม โดยเสนอการพัฒนาตัวแบบทางคณิตศาสตร์เพื่อวิเคราะห์หาเวลาหยุดที่เหมาะสมสำหรับการแปลงหนี้ให้เป็นทุน ทั้งการวิเคราะห์แบบ Deterministic และ Stochastic ภายใต้สถานการณ์ความไม่แน่นอนของตัวแปรเสี่ยงหลายตัว โดยใช้คอปูลา (Copula) วิเคราะห์ตัวแปรเสี่ยงที่มีความสัมพันธ์กัน ซึ่งจะช่วยเป็นการกำหนดตัวแปรสำคัญในตัวแบบทางคณิตศาสตร์ และนำตัวแบบทางคณิตศาสตร์ไปประยุกต์ใช้กับโครงการตัวอย่างจริง คือ โครงการทางพิเศษสายเมืองใหม่-เกาะแก้ว-กะทู้ จังหวัดภูเก็ต โดยเสนอเป็นทางเลือกให้กับหน่วยงานรัฐนำหุ้นกู้แปลงสภาพไปประยุกต์ใช้กับโครงการ PPP เพื่อวิเคราะห์เปรียบเทียบรูปแบบการสนับสนุนและโครงสร้างเงินทุนที่เหมาะสมสามกรณี ผลลัพธ์ที่ได้ คือ กรณีที่สามหน่วยงานรัฐให้การสนับสนุนเงินทุนชั้นลอยด้วยรูปแบบหุ้นกู้แปลงสภาพและให้เงินสนับสนุนทางตรงในโครงการ PPP ทำให้มีความคุ้มค่าทางการเงินของโครงการสูงสุด และสามารถวิเคราะห์หาเวลาหยุดที่เหมาะสมที่เกิดขึ้นในระยะเวลาดำเนินการของระยะสัมปทานโครงการได้

Scenario Analysis Of Drinking Water Infrastructure Rightsizing In Flint, Michigan: Model Pipe Conditions, Richard Casey Sadler, Hyun Jeong Koo, Basheer Allamy, Shawn P. Mcelmurry

Open Data at Wayne State

Sustainable urban systems require appropriately sized infrastructure. However, when cities face economic and population decline, hardened infrastructure - such as drinking water distribution systems – is difficult and costly to modify. This dataset provides the results of a modeling exercise performed using EPANET (Version 2.2) to examine potential scenarios for rightsizing water infrastructure in a shrinking city. The modeling was performed utilizing a full-scale, calibrated hydraulic model of the drinking water distribution system in Flint, Michigan obtained through a Memorandum of Understanding between the City of Flint and Wayne State University.

For this analysis, in addition to a base model, …

Scenario Analysis Of Drinking Water Infrastructure Rightsizing In Flint, Michigan: Model Census Tract Results, Richard Casey Sadler, Hyun Jeong Koo, Basheer Allamy, Shawn P. Mcelmurry

Open Data at Wayne State

Sustainable urban systems require appropriately sized infrastructure. However, when cities face economic and population decline, hardened infrastructure - such as drinking water distribution systems – is difficult and costly to modify. This dataset provides the results of a modeling exercise performed using EPANET (Version 2.2) to examine potential scenarios for rightsizing water infrastructure in a shrinking city. The modeling was performed utilizing a full-scale, calibrated hydraulic model of the drinking water distribution system in Flint, Michigan obtained through a Memorandum of Understanding between the City of Flint and Wayne State University.

For this analysis, in addition to a base model, …

Digitalization Of Railway Transportation Through Ai-Powered Services: Digital Twin Trains, Salih Sarp, Murat Kuzlu, Vukica Jovanovic, Zekeriya Polat, Ozgur Guler

Engineering Technology Faculty Publications

Digitalization is a key concept that transformed the various industries through technologies like Internet of Things (IoT), Artificial Intelligence (AI), and Digital Twin (DT). Although innovations provided by the advancement of digitalization have paved the way for more efficient operations and products for transportation, the rail transportation sector struggles to keep up with the rest of the transportation industry, since trains are designed to last for decades, and the insufficient infrastructure investment leads to multiple railroad derailments across the globe. Therefore, the primary aim is to transform current railway systems into human-centric, adaptable, sustainable and future-proof networks, aligning with Industry …

Performance Reliability And Safety Index For Region Vii Highways, Aemal J. Khattak, Mm Shakiul Haque, Li Zhao

Mid-America Transportation Center: Final Reports and Technical Briefs

Roadway performance measures are used for operating, planning, and design purposes to improve services for road users. Simple statistics of the performance metrics such as measures of central tendency (e.g., mean, median) are often used for making operational and planning decisions. Even though such statistics are useful, they are, more than often, not comprehensive enough for making insightful operational and planning decisions. Consequently, performance reliability measures, which attempt to capture the day-to-day variability in performance, have the potential to benefit the areas of operation, planning, and design. Traffic data from Intelligent Transportation System facilitates the measurement of the reliability of …

Verification And Validation Of Pavement Models, Jaime Hernandez, Angeli Jayme, Hasan Ozer, Eyal Levenberg, Lev Khazanovich, Emin M. Kutay

Civil and Environmental Engineering Faculty Research and Publications

Model development activities are increasing in pavement research and engineering applications. At the same time, there is ambiguity and a lack of consistency with regard to checking and quantifying credibility and suitability for the intended application. Specifically, usage of the terms Verification and Validation (V&V) is seen to vary across contributions. In this context, this paper was motivated by the desire to provide a best-practice reference that underlines the significance of the V&V terms, clarifies their definition, and promotes a more unified usage. Accordingly, the objective was to offer examples that introduce the V&V jargon, demonstrate basic V&V concepts and …

Stormwater Alters The Resistome Of Urban Surface Water, An Impact That Can Be Mitigated By Green Stormwater Infrastructure, Kassidy N. O'Malley, Walter M. Mcdonald, Patrick J. Mcnamara

Civil and Environmental Engineering Faculty Research and Publications

Antibiotic resistance poses an escalating threat to global health, with environmental reservoirs being pivotal areas of concern, as well as opportunities for potential mitigation. Stormwater systems are an important type of environmental reservoir in the urban water cycle with a dearth of research related to impacts on antibiotic resistance. In particular, there has been limited research exploring the impact of diverse antibiotic resistance genes (ARGs) carried by stormwater from various land uses on surface water, nor has there been an examination of the role played by green stormwater infrastructure (GSI) in mitigating this impact. Therefore, this study sought to elucidate …

Developing A Model To Predict Bleeding Areas In Asphalt Pavements Using Artificial Neural Network, Rami Khalifah, Mena I. Souliman, Pratik Lama, Omar Elbagalati

Civil Engineering Faculty Publications and Presentations

Bleeding can have a negative effect on the performance of a pavement, as the layer of asphalt on the surface can become slippery, reduce skid resistance, and lead to premature wear and tear. Therefore, predicting the bleeding area in asphalt pavements will help in maintaining better pavements, increasing the safety of the drivers, and delivering timely maintenance. The aim of the study is to develop a model using a highly sophisticated analysis tool called an artificial neural network (ANN) to predict the bleeding areas in asphalt pavements as output, with one hidden layer and several neurons and using several independent …

Assessment Of Drainage Characteristics Of Recycled Crushed Concrete Aggregate (Rcca) And Plastic Mix Pavement Base, Amena Begum

Civil Engineering Theses - Archive

Recycled Crushed Concrete Aggregate (RCCA) offers a sustainable alternative to natural aggregate in construction, reducing reliance on natural resources and diverting construction and demolition debris from landfills. Similarly, the escalating global plastic waste crisis highlights the need for innovative solutions to address non-biodegradable waste disposal challenges and create opportunities for recycling plastics into value-added applications. This study explores the potential of RCCA mixed with plastic waste, such as HDPE and PP, as a viable substitute for natural aggregates in flexible pavement base layers, with a focus on hydraulic properties and drainage performance to enhance pavement durability.

A comprehensive experimental program …

Impact Of Augmented Documentation Workflows On Transportation Agency Asphalt Paving Operations: A Qualitative And Quantitative Study, Josh Withrow

Theses and Dissertations--Civil Engineering

e-Ticketing was an intriguing technology to many state transportation agencies (STAs) pre-COVID-19 pandemic but gained significant attention upon arrival of the pandemic due to the contactless nature of the technology. Research completed prior to the pandemic into e-ticketing for asphalt paving primarily identified qualitative benefits and concerns. However, minimal academic literature exists in the post-pandemic era discussing the additional e-ticketing benefits not previously captured which resulted in increased implementation by STAs. This research seeks to address this gap by gathering information from state members of the American Association of State Highway and Transportation Officials Committee on Construction (AASHTO COC), employees …

Estimation Of Mechanical Behavior Of Unsaturated Soils From A Soil-Water Characteristic Curve, Lucas Acheampong

Theses and Dissertations--Civil Engineering

The small-strain shear modulus and shear strength are two crucial mechanical behaviors used in the design of geotechnical structures and in the analyses of earth materials subjected to static and dynamic loadings. Traditional testing methods for these parameters are expensive and time-consuming. This research aimed to address these challenges by developing a model based on the inverse relationship between mechanical behavior of unsaturated soils and the soil-water characteristic curve (SWCC). The proposed model integrates a scaling function to align the SWCC with the mechanical property curve. Empirical relationships were established for the scaling function, specifically aligning with the air-entry value …

Geophysical Method Used For The Determination And Prediction Of Soil Strength And Stiffness Parameters, Dabo Adama

Theses and Dissertations--Civil Engineering

This paper presents the results of an effort to use geophysical measurements such as seismic wave velocities and electrical resistivities to calculate airfield design parameters. The study converts all geophysical measurements to equivalent California Bearing Ratio (CBR) values, comparing CBR values estimated from DCP penetration resistance with CBR values estimated from shear wave velocity and electrical resistivity values. Relationships linking the geophysical measurements to CBR estimates were established using laboratory data and applied to field in-situ measurements. The elastic modulus (E) is the stiffness parameter involved in predicting soil strength and stiffness. This research aims to relate electrical conductivity and …

Analysis And Improvement Of The Kentucky Transportation Cabinet’S Serious Injury And Fatality Program, Arun Subedi

Theses and Dissertations--Civil Engineering

Serious Injuries and Fatalities (SIFs) within construction and maintenance industries indicate severe vulnerabilities within workplace safety, and their prevention requires the highest priority. SIFs usually occur due to systemic failures, and proactive steps must be taken to identify and neutralize high-risk scenarios. Kentucky Transportation Cabinet (KYTC) has recently implemented a safety management system called BOOTS, for improving incident reporting and analysis along with SIFs. This study identifies gaps in KYTC's SIF reporting framework and provides analysis on recurring incident trends utilizing the incidents already reported in the system. While current practice in KYTC relies on event-based decision tree when classifying …

Digital Innovation Roadmap For Construction Industry: Bridging The Gap For Future, Nisa Zahin

Theses and Dissertations--Civil Engineering

Digitalization has considerable value in the digital transformation of the construction business. It means the use of digital technologies to create revenue, improve business, increase profit and sustainability, and create an environment for digital business whereby digital information is at the core. As such, digital transformation requires skills that involve extracting and exchanging data and analyzing and converting that data into actionable information. In addition to technological solutions, a paramount need is to ensure that the people using these solutions and the processes used to integrate, coordinate between teams, and continuously improve the use of technology are in place. Therefore, …

Thermal Alteration Of The Mineralogy Of Calcium Sulfoaluminate Cements: Implications For The Performance Of Rapid Repair Materials, Jillian Cavellier

Theses and Dissertations--Earth and Environmental Sciences

Calcium sulfoaluminate (CSA) was developed in part to lessen the environmental impact of cementitious materials compared to traditional Portland cements. CSA was first put into production in the 1970s and has been undergoing various performance testing to investigate its durability. Yet to be evaluated is CSA’s response to a rapid, high temperature event. In this study, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectrometry and scanning electron microscope imaging were used to analyze alterations in the mineralogy due to such an event. As found in previous studies, after ~125°C, ettringite has been completely dehydrated. Ettringite decomposes into bassanite and calcium …

Polymeric Spray-Applied Pipe Lining Selection, Evaluation And System Design, Sanaz Ghalambor

Civil Engineering Dissertations - Archive

POLYMERIC SPRAY-APPLIED PIPE LINING SELECTION, EVALUATION

AND SYSTEM DESIGN

Sanaz Ghalambor, PhD

The University of Texas at Arlington, 2024

Supervising Professor: Dr. Mohammad Najafi

Numerous pipes are considerably aged, and most are no longer functional. Immediate attention is required to either restore or replace these pipelines. To avoid digging up and replacing underground pipes, the Spray-Applied Pipe Lining (SAPL) rehabilitation technology, also known as Spray-In-Place-Pipe (SIPP) lining, can be used for pipe rehabilitation. This approach lowers expenses and downtime while preserving landscapes and structures and enhancing hydraulic characteristics. Although lining water pipes through spray application is the oldest pipeline rehabilitation …

Advanced Network And Graph Theoretical Approaches To Urban Traffic Control And Optimization, Peirong Wang

Civil Engineering Dissertations - Archive

This article-based dissertation consists of four complete manuscripts related to using proposed advanced network and graph theoretical approaches to optimize traffic control. Manuscript One addresses the integration of Connected Automated Vehicles (CAVs) and human-driven vehicles in heterogeneous traffic networks. Traditional models assume uniform driving behaviors, which are now inadequate. To address this, an integer programming formulation for a vehicle-oriented traffic dynamics model in space-time networks is introduced. This model distinguishes between individual vehicles and their unique driving behaviors, capturing diverse attributes of heterogeneous traffic flow. The manuscript demonstrates how the model can estimate the propagation of backward shockwaves for scheduled …

Investigating Urban Impacts On Temperature And Rainfall Using Drone, Radar And Machine Learning Techniques, Junaid Ahmad

Civil Engineering Dissertations - Archive

The global urban population is increasing, and it is anticipated that approximately 70% of people will reside in urban areas by 2050. Urbanization changes land use and land cover, altering local climatology. For example, various urban centers across the globe are experiencing extreme rainfall events, resulting in widespread damage to life and property with possible linkages to urbanization. The use of artificial materials in urban areas brings significant changes to the surface temperatures. Due to the high heat capacity of most of the construction materials, the temperature of the urban area can increase substantially compared to the rural areas. This …

Flood Frequency Analyses Using Depth-Area Reduction Factors (Darfs) In Texas, Mohamad Ahmadzadeh

Civil Engineering Dissertations - Archive

The increasing frequency and severity of flood events globally necessitate more accurate and reliable hydrologic models to inform flood risk management and mitigation strategies. Traditional hydrologic models have often relied on the simplification of uniformly distributed rainfall across watersheds, a method that fails to account for the spatial variability inherent in real-world storm events. This dissertation addresses this critical gap by applying Depth-Area Reduction Factors (DARFs) in hydrologic modeling, specifically focusing on the Trinity and Neches River Basins in Texas. DARFs are used to adjust point rainfall data to reflect the reduction in rainfall intensity as storm areas increase, thereby …