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Ensemble Of Recurrent Neural Networks With Long Short-Term Memory Cells For High-Rate Structural Health Monitoring, Vahid Barzegar, Simon Laflamme, Chao Hu, Jacob Dodson 2022 Iowa State University

Ensemble Of Recurrent Neural Networks With Long Short-Term Memory Cells For High-Rate Structural Health Monitoring, Vahid Barzegar, Simon Laflamme, Chao Hu, Jacob Dodson

Civil, Construction and Environmental Engineering Publications

The deployment of systems experiencing high-rate dynamic events, such as hypersonic vehicles, advanced weaponry, and active blast mitigation systems, require high-rate structural health monitoring (HRSHM) capabilities in the sub-millisecond realm to ensure continuous operations and safety. However, the development of high-rate feedback systems is a complex task because these dynamic systems are uniquely characterized by (1) large uncertainties in their external loads, (2) high levels of non-stationarity and heavy disturbance, and (3) unmodeled dynamics from changes in system configuration. In this paper, we present a deep learning algorithm specifically engineered for HRSHM applications. It consists of an ensemble of recurrent ...


Flexural Strengthening Of Rc Slabs Using Near Surface Mounted Gfrp Bars, Sama Taha 2022 American University in Cairo

Flexural Strengthening Of Rc Slabs Using Near Surface Mounted Gfrp Bars, Sama Taha

Theses and Dissertations

Glass Fiber reinforced polymers (GFRPs) have been recently successfully used to increase reinforced concrete elements' strength. In general, FRPs have many advantages such as resistance to corrosion, and high strength-to-weight ratio. On the other hand, debonding from concrete may constitute a limitation to using GFRP bars; hence the increase in strength of RC elements strengthened using GFRP bars may be limited by this premature debonding failure mechanism.

This study aims to investigate the strengthening effect of GFRP bars on the capacity of RC slabs when subject to flexure loading. The work studies the use of different bonding lengths, diameters and ...


Strengthening Of Long Rc Columns Using Near Surface Mounted Gfrp Bars, Ahmed Romaih 2022 American University in Cairo

Strengthening Of Long Rc Columns Using Near Surface Mounted Gfrp Bars, Ahmed Romaih

Theses and Dissertations

Many of the existing reinforced concrete (RC) columns are deficient because of numerous reasons such as increase in service loads, deterioration due to environmental attacks, errors in the design and/or construction phase or in the worst case, accidents. These elements require strengthening or repair. Different methods have been developed over the years for solving different rehabilitation problems. Recently, advanced composites used for external bonding in the form of fabrics or laminates have become an accepted method. The use of Fibre-Reinforced Polymers (FRPs) in this process is a promising technology, especially that these materials are corrosion-free. One of the new ...


Potential Water Treatment Residual Used For Eutrophication Prevention: Varying Bake Time And Wet-Dry Release Experiments, Noor Fahoum 2022 The University of Akron

Potential Water Treatment Residual Used For Eutrophication Prevention: Varying Bake Time And Wet-Dry Release Experiments, Noor Fahoum

Williams Honors College, Honors Research Projects

A challenge faced today in water ways is the excessive growth of algae due to eutrophication. These harmful algal blooms create problems for the environment and safety concerns for the use of water for drinking purposes. An increase in limiting nutrients such as nitrogen and phosphorus are one of the factors that contribute to eutrophication. This is a concern for the Akron Water Treatment plant where preventative measures are being taken to avoid the potential formation of harmful algal blooms and the cyanotoxins they may release in the water. Through various studies, water treatment residuals (WTR) have been found to ...


Ammonia Emission Assessment From Gasoline And Diesel Engines Under Utah Specific Conditions, Motasem Suleiman Abualqumboz 2021 Utah State University

Ammonia Emission Assessment From Gasoline And Diesel Engines Under Utah Specific Conditions, Motasem Suleiman Abualqumboz

All Graduate Theses and Dissertations

This study aims to quantify ammonia (NH3) emission rates from the on-road gasoline and diesel motor vehicles fleet of the Wasatch Front, Utah. For this purpose, a portable Pollution Emissions Monitoring System (PEMS) was used to estimate NH3 emission rates from a representative fleet of 53 in-use light-duty (LD) gasoline and diesel vehicles over a total of 166 on-road Real Driving Emissions (RDE) tests. The post-catalyst concentrations of NH3 precursors, nitrogen oxides (NOx) and carbon monoxide (CO) were also measured. The outcomes of this study showed that a motor vehicle in the Wasatch Front would emit ...


Machine Learning For High-Fidelity Prediction Of Cement Hydration Kinetics In Blended Systems, Rachel Cook, Taihao Han, Alaina Childers, Cambria Ryckman, Kamal Khayat, Hongyan Ma, Jie Huang, Aditya Kumar 2021 Missouri University of Science and Technology

Machine Learning For High-Fidelity Prediction Of Cement Hydration Kinetics In Blended Systems, Rachel Cook, Taihao Han, Alaina Childers, Cambria Ryckman, Kamal Khayat, Hongyan Ma, Jie Huang, Aditya Kumar

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The production of ordinary Portland cement (OPC), the most broadly utilized man-made material, has been scrutinized due to its contributions to global anthropogenic CO2 emissions. Thus -- to mitigate CO2 emissions -- mineral additives have been promulgated as partial replacements for OPC. However, additives -- depending on their physiochemical characteristics -- can exert varying effects on OPC's hydration kinetics. Therefore -- in regards to more complex systems -- it is infeasible for semi-empirical kinetic models to reveal the underlying nonlinear composition-property (i.e., reactivity) relationships. In the past decade or so, machine learning (ML) has arisen as a promising, holistic approach to predict ...


Perceptions Of Safety Climate In Construction Projects Between Workers And Managers/Supervisors In The Developing Country Of Iran, Daniel W. M. Chan, Matteo Cristofaro, Hala Nassereddine, Nicole S. N. Yiu, Hadi Sarvari 2021 Hong Kong Polytechnic University, China

Perceptions Of Safety Climate In Construction Projects Between Workers And Managers/Supervisors In The Developing Country Of Iran, Daniel W. M. Chan, Matteo Cristofaro, Hala Nassereddine, Nicole S. N. Yiu, Hadi Sarvari

Civil Engineering Faculty Publications

What are the different perceptions on safety climate (SC) by workers and managers/supervisors engaged in the construction industry of developing countries? Reconciling these two differing views is pivotal for mitigating and avoiding both the injured and fatal accidents in the construction industry, especially in those developing countries where safety conditions are poor and unpredictable, and safety measures are inadequate in most cases. To answer this research question, the collective perceptions of 118 construction workers and 123 managers/supervisors on the SC in construction projects in Iran were gleaned and investigated. In particular, these perceptions were initially collected by two ...


Common Ground Newsletter Fall 2021, Missouri University of Science and Technology 2021 Missouri University of Science and Technology

Common Ground Newsletter Fall 2021, Missouri University Of Science And Technology

Common Ground

-Lighting the way with solar panel inspections
-CArEE Miner athletes score recognition
-Celebrating 150 years of civil engineering at S&T


Tuned Mass Damper, Ruichen Guo 2021 University of Tennessee, Knoxville

Tuned Mass Damper, Ruichen Guo

EURēCA: Exhibition of Undergraduate Research and Creative Achievement

Abstract

My research aims to design a tuned mass damper for a model structure. In the real world, tuned mass dampers are designed to limit the motion of the building when it is subjected to an external excitation, such as an earthquake or hurricane. The design of the mass damper involves determining the mass, stiffness of the spring, and the dimensions of the mass. Once the tuned mass damper is fabricated, I will conduct experimental testing to identify the effectiveness of the tuned mass damper to control the response of a four-story model building. I expect that the mass damper ...


Analysis Of Flexural Capacity Of A Novel Straight-Side U-Shaped Steel-Encased Concrete Composite Beam, Qiwu Yan, Zheng Zhang, Jin Yan, Simon Laflamme 2021 Central South University

Analysis Of Flexural Capacity Of A Novel Straight-Side U-Shaped Steel-Encased Concrete Composite Beam, Qiwu Yan, Zheng Zhang, Jin Yan, Simon Laflamme

Civil, Construction and Environmental Engineering Publications

This paper proposes a novel straight-side U-shaped steel-encased concrete composite beam (SUSCCB). The SUSCCB is constituted by encasing the top sections of the U-shaped steel plates directly into the concrete flange, with the composite action generated through perfobond connections consisting of reinforcement bars transversely passing through perforations in the encased top sections of the steel plates. It is engineered to overcome the shortcomings of the existing varus or valgus U-shaped steel-encased concrete composite beams (USCCB), for which the installation of shear connectors can be complex and costly to achieve because of the numerous required welds. The main objective of this ...


Building Services Engineering September/October 2021, 2021 Technological University Dublin

Building Services Engineering September/October 2021

Building Services Engineering

No abstract provided.


Engineering Sciences Innovative Approaches, Yeliz Asci 2021 Eskisehir Osmangazi University

Engineering Sciences Innovative Approaches, Yeliz Asci

Engineering Sciences

No abstract provided.


Sustainable Building Materials Of The Future: Architectural Forms And Structural Design, Sean Sadler, Moritz Meditz 2021 Kennesaw State University

Sustainable Building Materials Of The Future: Architectural Forms And Structural Design, Sean Sadler, Moritz Meditz

Symposium of Student Scholars

This research investigates the use of non-rigid formwork and the techniques aiming to create more efficient concrete forms. During casting, concrete takes the shape of its formwork; traditionally, these formworks are made of rigid materials like steel or wood. The results are prismatic members, which are not optimized for material usage but only for simplicity in construction. Most of the research in the area focuses on improving the constituent materials, while the formworks have remained unchanged throughout the years. By using the approach described in this study, optimized shapes are achieved. These geometries can save up to 30% of the ...


Analysis And Characterization Of Microplastics In Water Treatment Plants, 2021 Kennesaw State University

Analysis And Characterization Of Microplastics In Water Treatment Plants

Symposium of Student Scholars

Plastic pollution is a growing public concern due to its effect on our environment and oceans. Based on the increasing prevalence of microplastics in the environment, they are now present in potable water. Microplastics can be defined as pieces of synthetic polymers that can typically be measured to be smaller than five millimeters. Microplastics can stem from sources such as beauty products containing microbeads, polystyrene foam packaging, and the deterioration of disposable plastic items. Much of this waste enters natural water bodies, which is the source of our drinking water. Little is known about the microplastics contaminating our water treatment ...


Using Comprehensive Finite Element Analysis To Simulate A Special Connection In Post-Tensioned Concrete, Joshuah Leljedal 2021 Kennesaw State University

Using Comprehensive Finite Element Analysis To Simulate A Special Connection In Post-Tensioned Concrete, Joshuah Leljedal

Symposium of Student Scholars

Finite element analysis (FEA) uses differential equations to determine a computer-based solution that explains interactive behaviors within models of complex structural and mechanical systems, subjected to various loading and environmental conditions. Those systems are partitioned into finite elements consisting of a linear mesh with nodes at each end point, and FEA determines relationships, such as force-displacement, between each of the finite elements. This apportioned model allows systems to be evaluated under multiple loading scenarios. Computer-based FEA offers significant benefits that reduce cost and the time required to perform alternative analysis for complex structural systems. In this research project, a comprehensive ...


A Special Slab-Wall Connection In Post-Tensioned Concrete, Mohammad Jonaidi 2021 Kennesaw State University

A Special Slab-Wall Connection In Post-Tensioned Concrete, Mohammad Jonaidi

Symposium of Student Scholars

Post tensioned concrete is a widely used method in the construction of the slab of high-rise buildings, podium (transferred) slab of wood-framed structures, bridges and so on. The effects of slab shortening due to concrete shrinkage and post-tensioning compression should be considered in the design of the structure. Various connections, between slab and wall, are used in the industry. However, the behavior of a special connection which consists of steel reinforcement dowels wrapped with compressible material has not been investigated. This research study investigates a case that requires a permanent slip detail in which the dowel between the shear wall ...


A Case Study On Medium And High Rise Timber Buildings, Moustafa EL-Assaly 2021 The University of Western Ontario

A Case Study On Medium And High Rise Timber Buildings, Moustafa El-Assaly

Electronic Thesis and Dissertation Repository

Heavy timber is the upcoming and rising star in the construction industry in the European and north American market. However, this topic is yet to be discovered. Light frame wood LFW has been used for decades but was always restricted to certain limits. Limits that heavy timber can overcome easily. In this thesis, topics related to the application of heavy timber in the construction of buildings are searched. First, a comparative study based on the Canadian market discussing the alternatives heavy timber can offer such as glulam and cross laminated timber (CLT) in comparison with LFW when applied to mid-rise ...


Exploring How Antecedent Precipitation Amount And The Effects Of Covid-19 Affect Stormwater Runoff Quality Along Urban Gradients, Daniel Ramirez, Katherine Gelsey 2021 Portland State University

Exploring How Antecedent Precipitation Amount And The Effects Of Covid-19 Affect Stormwater Runoff Quality Along Urban Gradients, Daniel Ramirez, Katherine Gelsey

REU Final Reports

Stormwater runoff quality is affected by a multitude of factors including surrounding land characteristics, human activities, and antecedent precipitation amounts. We explore how seasonal and variable precipitation affect E. Coli, total suspended solids, nitrogen-nitrate, orthophosphate, lead, and zinc concentrations in Portland, OR, USA. Correlation analysis was conducted between the pollutant concentrations and antecedent rainfall each sample site received for the previous 1, 3, 5, 7, and 30 days from when the sample was taken. We ran Mann-Whitney tests to determine if the levels of the pollutants were statistically different between the wet season and the dry season. We found that ...


The Optimization Of Cable Domes, Hannah Tulloch 2021 Western University

The Optimization Of Cable Domes, Hannah Tulloch

Undergraduate Student Research Internships Conference

No abstract provided.


Considerations For The Tornado-Resilient Structural Design Of Low-Rise Buildings, Cody J. Van Der Kooi 2021 The University of Western Ontario

Considerations For The Tornado-Resilient Structural Design Of Low-Rise Buildings, Cody J. Van Der Kooi

Electronic Thesis and Dissertation Repository

Building codes and standards have begun to incorporate tornado-specific loads to help protect community infrastructure against these potentially devastating storms, with a specific focus on low-rise buildings. The current tornado design loads are derived from atmospheric boundary layer (ABL) winds, even though it is relatively unclear to what extent tornado and ABL wind loads are equivalent for a given intensity. This research focuses on the tornado-resilient design of the main wind force resisting system (MWFRS) and component and cladding (C&C) elements of a low-rise gable roof building. Tornado loads derived from the results of experiments completed in a vortex ...


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