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Articles 1 - 30 of 42
Full-Text Articles in Engineering
An Assessment Of The Accuracy Of The Euler-Bernoulli Beam Theory For Calculating Strain And Deflection In Composite Sandwich Beams, Qhinhon D. Ho
An Assessment Of The Accuracy Of The Euler-Bernoulli Beam Theory For Calculating Strain And Deflection In Composite Sandwich Beams, Qhinhon D. Ho
University of New Orleans Theses and Dissertations
This study focuses on assessing the accuracy of the Euler-Bernoulli beam theory as computational bases to calculate strain and deflection of composite sandwich beam subjected to three-point and four-point bending. Two groups of composite sandwich beams tests results will be used for comparison purposes. Mechanical properties for the laminated skin are provided by researchers from University of Mississippi (Ellen Lackey et al., 2000). Mechanical properties for the balsa wood core are provided by Alcan Baltek Corporation. Appropriate material properties and test geometries are then used in the Euler-Bernoulli-based algorithm in order to generate analytical data for comparison to experimental data …
Comparative Analysis Of Buckling-Restrained Braced Frames In Eccentric Configuration (Brbf-Es) And Eccentrically Braced Frames (Ebfs), Peter T. Vayda
Comparative Analysis Of Buckling-Restrained Braced Frames In Eccentric Configuration (Brbf-Es) And Eccentrically Braced Frames (Ebfs), Peter T. Vayda
Civil Engineering Undergraduate Honors Theses
Continuing on the findings of “Using Buckling-Restrained Braced Frames in Eccentric Configuration,” by Dr. Gary S. Prinz, P.E., which determined that, from a performance standpoint, BRBF-Es could be a viable alternative for EBFs. A comparative analysis was conducted on the design procedures and initial cost estimates of BRBF-Es and EBFs. Upon designing four 12-Story buildings (two BRBF-Es and two EBFs), it was determined that BRBF-Es were easier to design due to the statically determinant system. The initial costs estimates of BRBF-Es; however, ranged upwards of 30% more cost than EBFs. Therefore, the initial investment of more intensive structural engineering design …
Soil-Structure Modeling And Design Considerations For Offshore Wind Turbine Monopile Foundations, Wystan Carswell
Soil-Structure Modeling And Design Considerations For Offshore Wind Turbine Monopile Foundations, Wystan Carswell
Doctoral Dissertations
Offshore wind turbine (OWT) support structures account for 20-25% of the capital cost for offshore wind installations, making it essential to optimize the design of the tower, substructure, and foundation to the extent possible. This dissertation focuses on monopile foundations, as the vast majority (approximately 75%) of currently installed OWTs are supported by monopile structures. The objective of this dissertation is to provide information on the behavior of monopile support structures to better substantiate design and planning decisions and to provide a basis for reducing the structural material costs. In pursuit of these objectives, research is presented on the topics …
Experimental And Predicted Behavior Of Frp Beam-Columns Including Retrofitting, Ali Al-Huazy
Experimental And Predicted Behavior Of Frp Beam-Columns Including Retrofitting, Ali Al-Huazy
Civil & Environmental Engineering Theses & Dissertations
This thesis presents the outcome of a theoretical and experimental study of Fiber Reinforce Polymer (FRP) beam-columns with uniaxial bending and including retrofitting. The research involved the design and fabrication of a testing apparatus which was then used for a series of beam-column tests. Three different types of beam-column cross sections were used, namely, channel section, I-section, and square tube section. Six non-retrofitted beam-columns were tested in addition to two retrofitted ones. The members were subjected to an eccentric vertical load applied through a lever arm generating gradually increasing axial load and uniaxial bending moment up to the maximum load. …
Behavior And Strength Of Pultruded Frp I-Section Columns Including Uniaxial And Biaxial Bending, Emad M. Amin
Behavior And Strength Of Pultruded Frp I-Section Columns Including Uniaxial And Biaxial Bending, Emad M. Amin
Civil & Environmental Engineering Theses & Dissertations
This thesis presents the outcome of a study of the behavior and strength of pultruded glass fiber reinforced polymer (FRP) I-section columns including uniaxial and biaxial applied bending moments. Also included in the study is a critical assessment of ASCE-LRFD Pre-standard for pultruded FRP structures in view of the rigorous analysis presented herein. The theoretical solution is based on a system of three coupled differential equations of equilibrium combined with pinned flexural and torsional boundary conditions. Effects of induced warping due to second-order terms as well as initial out-of-straightness are accounted-for in the governing differential equations. Detailed investigations into the …
Shear And Peel Stresses At The Interface Between Hollowcore Slabs And The Topping Concrete, Aiham Adawi
Shear And Peel Stresses At The Interface Between Hollowcore Slabs And The Topping Concrete, Aiham Adawi
Electronic Thesis and Dissertation Repository
Hollowcore slabs are used in floors and roofs of residential, commercial, industrial and institutional buildings. They are precast/prestressed concrete elements produced using the extrusion process. Their surface finish can be “machine-cast” or “intentionally roughened”. A typical floor consists of a number of hollowcore slabs that are connected together. Prestressing causes hollowcore slabs to camber, which results in an uneven floor surface. A 50 mm topping concrete is commonly cast to level the floor surface. To avoid delamination, engineers require bonding agents to be applied on the hollowcore slab surface before pouring the topping concrete. The concrete topping can be used …
Behaviour Of Helical Pile Connectors For New Foundations, Muhammad Ahmad Muhammad Diab
Behaviour Of Helical Pile Connectors For New Foundations, Muhammad Ahmad Muhammad Diab
Electronic Thesis and Dissertation Repository
Despite the wide application of the connections between slender pile types, which end with a mono steel bar at the ground level (e.g. helical piles and micro piles), and new reinforced concrete foundations with limited width (e.g. RC grade beams) in the piling industry in North America, neither a clear understanding of the connections' behaviour nor a specific design criteria for their implementation is presented.
The main goal of this research was to clearly understand the behaviour of these connections and their failure mechanism under monotonic and cyclic loadings. The research methodology involved conducting experimental tests on 33 full-scale pile-foundation …
Durability Of Lightweight Concrete For Bridge Decks, Andrew Mccullough Wagner
Durability Of Lightweight Concrete For Bridge Decks, Andrew Mccullough Wagner
Masters Theses
As concrete durability becomes a higher priority for departments of transportation’s acceptability of concrete for bridge decks, consideration of resistance to the penetration of chloride ions has become a key consideration in defining durability. For years the “Rapid Chloride Ion Penetration (RCP) test has been the accepted standard to measure penetrability of concrete to chloride ions. With the movement to use chloride ion penetrability as a part of acceptance criteria for a concrete mix, use of the newer and easier Surface Resistivity (SR) test as an alternative to the slower, more complicated “Rapid Chloride Ion” test became a desirable option. …
Performance Of Protective Perimeter Walls Subjected To Explosions In Reducing The Blast Resultants On Buildings, Fada Casi F Alsubaei
Performance Of Protective Perimeter Walls Subjected To Explosions In Reducing The Blast Resultants On Buildings, Fada Casi F Alsubaei
Electronic Thesis and Dissertation Repository
The existing methods to predict the blast effects on structures located behind blast walls are based on plane rigid walls and the results of small-scale studies, which are not validated by the results of full-scale experiments. Hence, they are only valid for a very limited range of scaled parameters. Also, they do not account for the impact of non-spherical charges or for different ignition points; they also put their emphasis on mid-and far-field overpressures.
The current thesis investigates blast wave propagations created by cuboid charges and their effects on structural members at close-in and nearby ranges. First, a preliminary numerical …
Bonded Anchors In Concrete Under Sustained Loading, Douglas Droesch
Bonded Anchors In Concrete Under Sustained Loading, Douglas Droesch
Masters Theses
Post installed anchors come in either mechanical anchors that develop their strength purely through mechanical interlock with the base concrete, or bonded anchors that develop their strength by bonding anchor rod to the base concrete. Bonded anchors are either grouted, typically cementitious material, or adhesive, typically a chemical material. This thesis presents a current literature review of post-installed bonded anchors, preliminary testing of adhesive bonded anchors, and details of short term and long term test setups for future testing. The purpose of this thesis was to develop the test setups that will be used for future testing on anchors.
Statistical Analyses Of Historical Pipeline Incident Data With Application To The Risk Assessment Of Onshore Natural Gas Transmission Pipelines, Chio Lam
Electronic Thesis and Dissertation Repository
Statistical analyses of the pipe-related incident data for onshore gas transmission pipelines between 2002 and 2013 collected by the Pipeline and Hazardous Material Safety Administration (PHMSA) of the United States Department of Transportation (DOT) are conducted. It is found that the total length of the onshore gas transmission pipelines in the US is approximately 480,000 km as of 2013. The third-party interference, external corrosion, material failure and internal corrosion are the leading causes for the pipe-related incidents, responsible for over 75% of the total incidents between 2002 and 2013. Based on the pipeline mileage and incident data, the average rate …
Experimental Investigation Of Fiber Reinforced Concrete Beams, Karrar Ali Al-Lami
Experimental Investigation Of Fiber Reinforced Concrete Beams, Karrar Ali Al-Lami
Dissertations and Theses
Shear strength of fiber reinforced concrete beams was studied in this research project. Three types of fibers were examined: hooked-end steel fiber, crimped-steel fiber, and crimped-monofilament polypropylene fibers. The experimental program included five beam specimens. Two of the beams were control specimens in which one was reinforced with minimum shear reinforcement according to ACI 318, while the other one did not have any shear reinforcement. Each one of the other three specimens was reinforced with one of the above mentioned fibers by 1% volumetric ratio. In addition to the beam specimens, three prisms were also made for each type fiber …
Power Maximization Of A Three-Phase Hydrokinetic Turbine, Matthew Carleson
Power Maximization Of A Three-Phase Hydrokinetic Turbine, Matthew Carleson
Senior Theses
As Earth`s expendable resources dwindle, the need for alternative, renewable energy sources grows. Out of this need, an old favorite source is rising in popularity: small water turbines. Water-driven turbines first began as a means for turning mills and eventually evolved into massive dams that can power whole regions. This project focused on the construction of, and testing the properties of, a small pico-hydro power turbine. By using compressed air to drive the turbine, a representation of the peak power output was measured, serving as a basis for determining the value of pico-power systems in regards to the world`s current …
Application Of Polyurethane Products In Accelerated Construction Of Innovative Noise Barrier, Bahman Daee
Application Of Polyurethane Products In Accelerated Construction Of Innovative Noise Barrier, Bahman Daee
Electronic Thesis and Dissertation Repository
Noise barriers (sound walls) are usually constructed along roadways to mitigate the airborne noise emanating from vehicles. They are currently built using various materials including precast concrete panels, masonry, wood and transparent sheets. The main challenge in roadside construction is the obstruction of roadways during the construction, which may result in traffic congestion, public dissatisfaction, car collision and subsequently fatalities. In order to decrease the risk of roadside construction, accelerated and non-obstructive methods are highly preferred by transportation authorities.
An innovative wall system comprised of polyurethane products is proposed, developed and investigated for application in accelerated construction of noise barriers. …
Behavior Of Reinforced Concrete Beams Retrofitted In Flexure Using Cfrp-Nsm Technique, Salam Al-Obaidi
Behavior Of Reinforced Concrete Beams Retrofitted In Flexure Using Cfrp-Nsm Technique, Salam Al-Obaidi
Dissertations and Theses
A variety of retrofitting methods are used to upgrade existing structures. For example, steel plates and Fiber Reinforced Polymer (FRP) jackets are externally bonded to members to increase their capacity in flexure and shear. However, due to the issue of corrosion these strengthening systems may lose their efficiency with time. FRP materials have been used to strengthen many structural components of different shapes and types. FRP jackets, FRP Strips, and FRP rods have commonly been used to rehabilitate existing structural components. The many advantages of using FRP as strengthening materials have made this material an attractive alternative: advantages such as …
Cleveland Sidewalk Studies: Plan For Blythe Avenue Area Sidewalk Extension To 20th Street Se And Plan For Neighborhood Connector Sidewalks To Wildwood Avenue, Thuy Trieu, Kelly Nicholas, Scott Rice, Michael Williams, Heath Sain, Jonathan Reagan
Cleveland Sidewalk Studies: Plan For Blythe Avenue Area Sidewalk Extension To 20th Street Se And Plan For Neighborhood Connector Sidewalks To Wildwood Avenue, Thuy Trieu, Kelly Nicholas, Scott Rice, Michael Williams, Heath Sain, Jonathan Reagan
Chancellor’s Honors Program Projects
No abstract provided.
Bulbous Pier: Alternative To Bridge Pier Extensions, Amilcar Chavez
Bulbous Pier: Alternative To Bridge Pier Extensions, Amilcar Chavez
UNLV Theses, Dissertations, Professional Papers, and Capstones
Bridge deck splashing causes deterioration to the bridge structure and renders the bridge unsafe for motorist and pedestrians. The traditional countermeasure for bridge deck splashing is pier extension, the pier extension moves the pier wave away from the bridge deck, but retrofitting existing bridges with pier extensions is costly. This research proposes the bulbous pier concept as an alternative to pier extension.
The decrease in the pier wave produced by the bulb is due to energy subtracted by the bulb via two forces, the viscous resistance, and the wave-making resistance. The proposed mathematical model for the bulbous pier design follows …
Alkali-Silica Reaction Mitigation Using High Volume Class C Fly Ash, Sydney Marie Dickson
Alkali-Silica Reaction Mitigation Using High Volume Class C Fly Ash, Sydney Marie Dickson
Civil Engineering Undergraduate Honors Theses
Fly ash is the residue produced from coal combustion in electric generating plants. There are two types of fly ash, Class C and Class F. Approximately 40 percent of fly ash generated from coal combustion can be used as a partial replacement of cement in concrete. Incorporating fly ash improves concrete properties and extends its service life. Alkali-silica reaction (ASR) is an expansive reaction between reactive silica typically found in aggregates (rock and sand) and alkalis in cement. This reaction results in the formation of a gel that absorbs water and swells, which exerts an internal pressure in concrete. This …
Drive Plate Mass Polar Moment Of Inertia In Stokeo Type Resonant Column Devices, Michael Ryan Deschenes
Drive Plate Mass Polar Moment Of Inertia In Stokeo Type Resonant Column Devices, Michael Ryan Deschenes
Civil Engineering Undergraduate Honors Theses
The calibration procedure employed by researchers at the University of Arkansas (UA) to calibrate two Stokoe-type resonant column torsional shear (RCTS) devices is presented herein. Specifically, the development of a device-specific calibration process to determine the mass polar moment of inertia of the RCTS drive plate assemblies (J0), as a function of frequency, is described. Three aluminum calibration specimens and three stainless steel masses with known geometric and material properties were utilized to experimentally determine the J0 values. Experimental data collected by researchers at the University of Arkansas and obtained from other sources (Utah State University, the University of Texas …
Analyzing Stochastically Generated Material Properties For The Use In Mumerical Simulations Of Advanced Laboratory Tests Of Asphalt Concrete, Ken K. Rutabana
Analyzing Stochastically Generated Material Properties For The Use In Mumerical Simulations Of Advanced Laboratory Tests Of Asphalt Concrete, Ken K. Rutabana
Civil Engineering Undergraduate Honors Theses
For such a large country as the US, adequate road transportation is a vital necessity that ensures the safety, prosperity, and development of the people. Covering 94% of the two million miles of paved roads and highways, asphalt concrete is essential to this country. This is one reason why it is crucial to understand the potential and limitations of asphalt concrete. Unfortunately, material testing is a costly and time consuming ordeal. Consequently, numerical modeling of asphalt testing using computer software has been successfully developed in the last decades. These models corroborate those obtained in the lab but are intended as …
Development Of Optimal Experimental Design Parameters For Pseudo Ambient Vibration Testing Of Bridges, David Samudio Castillo
Development Of Optimal Experimental Design Parameters For Pseudo Ambient Vibration Testing Of Bridges, David Samudio Castillo
Civil Engineering Undergraduate Honors Theses
The United States of America is facing an infrastructure crisis that is characterized by aging and deteriorating structures, a significant backlog of maintenance and upgrades for existing infrastructure, limited funding and lack of practical and effective tools for identifying and prioritizing the most pressing infrastructure needs. The American Association of Civil Engineers (ASCE) qualifies America’s infrastructure with a D+(ASCE Report Card). This rating reflects the general state of infrastructure that is unlikely to improve dramatically in the short-term, yet the situation costs the nation billions of dollars annually due to losses in economic efficiency and productivity, and in some cases …
A Study Of The Influence Of Particle Gradation In Bonded Assemblies, Matthew P. Watters
A Study Of The Influence Of Particle Gradation In Bonded Assemblies, Matthew P. Watters
Civil Engineering Undergraduate Honors Theses
The discrete element method (DEM) has been used extensively to study soil, rock, and masonry behavior because of its ability to model the materials as individual particles or bonded clumps of particles. DEM allows for examination of the macro- and micro-scale response and provides a means to study the fundamental material behavior, but it is still considered computationally expensive in relation to other methods. To lower computational costs, the smallest particle sizes are often considered negligible and are left out of the model. Additionally, rock or intact materials are often modeled as a bonded assembly of uniform spheres. To date, …
Modeling Of Debonding And Crack Propagation In Fibrous Composites Using A Discontinuous Galerkin Approach, Wesley Michael Hicks
Modeling Of Debonding And Crack Propagation In Fibrous Composites Using A Discontinuous Galerkin Approach, Wesley Michael Hicks
Masters Theses
A recently proposed Discontinuous Galerkin (DG) method for modeling debonding and fracture within the context of the finite element method is investigated for problems relating to fiber reinforced composites, namely fiber-matrix interfacial debonding which progresses to matrix fracture. The results are then compared against an existing intrinsic cohesive zone method and a hybrid Discontinuous Galerkin method. The results show that the method can eliminate the problem of artificial compliance that is associated with intrinsic cohesive zone models. Eliminating this stiffness has the positive effect of removing user-defined numerical parameters that are not actually present in the physical system. A key …
Design And Construction Of A Full-Scale Lateral Impact Testing Facility, Cody Aaron Mitchell
Design And Construction Of A Full-Scale Lateral Impact Testing Facility, Cody Aaron Mitchell
Masters Theses
The goal of this work is to design and construct a full scale lateral impact testing facility that is capable of recreating the damage that would be created by an overheight vehicle collision. This was accomplished by impacting a test specimen with an 8000 lbs. impact cart. The impact cart is raised on an elevated track and allowed to roll down the track with a change in height of 10 ft. This change in height is what provides the impact force necessary to recreate an overheight vehicle collision. The track is constructed out of wood and is designed to withstand …
State Of Accelerated Bridge Construction (Abc) In The United States, Mike Ofili
State Of Accelerated Bridge Construction (Abc) In The United States, Mike Ofili
Honors College Theses
The purpose of this project is to develop a toolkit for the design and construction of bridges using prefabricated materials primarily to reduce the closure time and on-site construction time of newly constructed bridges or bridges undergoing renovation. The research focuses specifically on short span bridges in Georgia (40,60,80, and 120ft spans).
Areas of primary concern for this project were design, constructability, structural analysis, the use of concrete and steel girders, cost efficiency, and industry surveys. In this particular portion of the study, the surveys proved to be most effective when combined with information obtained existing research as well as …
Experimental And Numerical Study On Full-Scale Precast Steel Fibre-Reinforced Concrete Pipes, Nedal Mohamed
Experimental And Numerical Study On Full-Scale Precast Steel Fibre-Reinforced Concrete Pipes, Nedal Mohamed
Electronic Thesis and Dissertation Repository
Reinforced concrete (RC) pipes are widely used as open channels (non-pressurized pipes) for sewage and storm water conveyance. RC pipes have generally achieved a reliable long-term performance. Depending on multiple parameters (e.g. pipe diameter, pipe wall thickness, required strength, etc.) the pipe may have up to three welded reinforcement cages in order to resist anticipated loads. Each cage is an assembled unit of steel reinforcement consisting of circumferential and longitudinal bars or wires. The fabrication process of a steel cage reinforcement is time and labour consuming. Thus, eliminating the steel cage reinforcement will yield an overall reduction in the production …
Senior Design: Proposed Stem Academic Building, Middlesex Community College, Senior Design Class
Senior Design: Proposed Stem Academic Building, Middlesex Community College, Senior Design Class
Civil Engineering Student Work
2015 Civil Engineering Senior Design Project.
A proposal for a new STEM building to be constructed on the Middlesex Community College.
Completed by:
- Abdullah Al Bakri
- Ryan Benoit
- Brittany Brown
- Michael Buraczynski
- Samuel Colangelo
- Joseph Connolly
- Kyle Elmy
- Michael Fischer
- Victor Goitia Jurado
- Michael Hanley
- Andrew Malian
- Michael Mathews
- Dionys Quezada
- Katie Rougeot
- Jacob Santos
- Isadora Sartor
- Vega Yerko
Implications Of Heterogeneity In The Shock Wave Propagation Of Dynamically Shocked Materials, Jeffrey W. Lajeunesse
Implications Of Heterogeneity In The Shock Wave Propagation Of Dynamically Shocked Materials, Jeffrey W. Lajeunesse
Master's Theses (2009 -)
The field of shock physics as a whole has only recently begun to pay particular attention to modeling heterogeneous materials under shock loading. These materials are important because of their practicality in terms of creating stronger, more shock resistant materials. To understand why they absorb shock impact energy better than homogeneous materials means that the small-scale processes that occur during the shock loading of these heterogeneous materials needs to be understood. Recent computational experiments, called mesoscale simulations, have shown that explicitly incorporating small-scale heterogeneous features into hydrocode simulations allows the bulk shock response of the heterogeneous material to be observed …
Resilience Of Transportation Infrastructure Systems To Climatic Extreme Events, Alexandra C. Testa
Resilience Of Transportation Infrastructure Systems To Climatic Extreme Events, Alexandra C. Testa
Masters Theses
A topology-based approach has been used to measure the resilience of a highway network to climatic events. Civil infrastructure systems are inarguably critical to the everyday functions of society. Because such systems are regionally distributed, their components undergo a wide range of hazard intensities, often dependent on their relative locations. The ability of an infrastructure system to withstand, adapt to, and rapidly recover from extreme events is paramount to its ability to continuously serve users. The topological properties of a network can provide a good means to assess the resilience of the system which is adequate to comprehend the preparedness …
Structural Vulnerability Assessment Of Bridge Piers In The Event Of Barge Collision, David A. Ribbans
Structural Vulnerability Assessment Of Bridge Piers In The Event Of Barge Collision, David A. Ribbans
Masters Theses
The inland waterway system in the United States is fundamental to the transportation system as a whole and the success of the nation’s economy. Barge transportation in these waterways levitates congestion on the highway system and is beneficial when comparing barge transportation to other modes of freight transportation in measures of capacity, congestion, emissions, and safety. Unavoidably, the highway system intersects with the waterways, resulting in the risk of vessels collision into bridge structures. Particularly for barge impact, the literature is questioning the accuracy and oversimplification of the current design specifications.
The impact problem was investigated in this research using …