Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Bridge (2)
- Coarsening (2)
- Dispersion (2)
- Downdrag (2)
- Durability (2)
-
- Finite element (2)
- Freeze-thaw (2)
- Mesh (2)
- Modeling (2)
- Refinement (2)
- Simplification (2)
- Soilcrete (2)
- ADV (1)
- ASTM D 1895-96 (1)
- Abutments (1)
- Access density (1)
- Access management (1)
- Acoustic Doppler velocimeter (1)
- Adaptation (1)
- Adaptivity (1)
- Adhesion (1)
- Advection (1)
- Aguamilpa (1)
- Air modeling (1)
- Al/steel joints (1)
- Aluminum to steel joining (1)
- Amdahl (1)
- Angle of repose (1)
- Animal-crashes (1)
- Arc Hydro Groundwater (1)
Articles 1 - 28 of 28
Full-Text Articles in Engineering
Assessing Water Quality Modeling In Subtropical Regions Based On A Case Study Of The Aguamilpa Reservoir, Oliver Obregon
Assessing Water Quality Modeling In Subtropical Regions Based On A Case Study Of The Aguamilpa Reservoir, Oliver Obregon
Theses and Dissertations
The shortage of water in Mexico has made public and private institutions look at reservoirs as an alternative solution for present and future water supply. However, eighty percent of the existing reservoirs in Mexico are contaminated at some level, many severely. Water quality models are water-management tools used to diagnose water quality problems and the impact of various environmental conditions. They can be effective in assessing various measures of remediation leading to improved water quality. In most of the cases such water quality models have been successfully applied in reservoirs located in temperate climates. However, the use of water quality …
Theoretical Determination Of Subcritical Sequent Depths For Complete And Incomplete Hydraulic Jumps In Closed Conduits Of Any Shape, Nathan John Lowe
Theoretical Determination Of Subcritical Sequent Depths For Complete And Incomplete Hydraulic Jumps In Closed Conduits Of Any Shape, Nathan John Lowe
Theses and Dissertations
In order to predict hydraulic jump characteristics for channel design, the jump height may be determined by calculating the subcritical sequent depth from momentum theory. In closed conduits, however, outlet submergence may fill the conduit entirely before the expected sequent depth is reached. This is called an incomplete or pressure jump (as opposed to a complete or free-surface jump), because pressure flow conditions prevail downstream. Since the momentum equation involves terms for the top width, area, and centroid of flow, the subcritical sequent depth is a function of the conduit shape in addition to the upstream depth and Froude number. …
Crashes In The Vicinity Of Major Crossroads, Charles G. Allen
Crashes In The Vicinity Of Major Crossroads, Charles G. Allen
Theses and Dissertations
Major crossroads are designed to facilitate the conflicting movements of numerous vehicles in a manner that is both safe and efficient. Accesses located within the functional areas of major crossroads add complication to intersection activity due to additional conflicts arising from ingressing and egressing movements at the accesses. In this research, the impact of accesses on crashes within major crossroad functional areas was analyzed. Specifically, the effects of access spacing within functional areas and access setback from intersections were addressed. In order to conduct the analysis, the functional areas of 159 signalized major arterial crossroads across the state of Utah …
Foundational Data Repository For Numeric Engine Validation, Jason Michael Hollingsworth
Foundational Data Repository For Numeric Engine Validation, Jason Michael Hollingsworth
Theses and Dissertations
Many different numeric models have been created to address a variety of hydraulic and hydrologic engineering applications. Each utilizes formulations and numeric methods to represent processes such as contaminant transport, coastal circulation, and watershed runoff. Although one process may be adequately represented by a model, this does not guarantee that another process will be represented even if that process is similar. For example, a model that computes subcritical flow does not necessarily compute supercritical flow. Selecting an appropriate numeric model for a situation is a prerequisite to obtaining accurate results. Current policies and resources do not provide adequate guidance in …
Effect Of Initial Scarification And Overlay Treatment Timing On Chloride Concentrations In Concrete Bridge Decks, Curtis Daniel Nolan
Effect Of Initial Scarification And Overlay Treatment Timing On Chloride Concentrations In Concrete Bridge Decks, Curtis Daniel Nolan
Theses and Dissertations
Considering the pervasive presence of chlorides in concrete bridge decks, bridge engineers have a critical responsibility to perform proper and effective preventive maintenance and rehabilitation operations. Bridge engineers often perform scarification and overlay (SO) procedures on concrete bridge decks to minimize the corrosion of reinforcing steel due to chloride ingress. Given the need to develop guidelines for the initial timing of SO treatments, the specific objectives of this research were to collect information from several department of transportation (DOT) personnel about their SO procedures and, subsequently, to determine the recommended timing of initial SO procedures on concrete bridge decks for …
Median Crossover Crashes In The Vicinity Of Interchanges On Utah Interstates, Katherine Elaine Winters
Median Crossover Crashes In The Vicinity Of Interchanges On Utah Interstates, Katherine Elaine Winters
Theses and Dissertations
While not accounting for a significant proportion of overall crashes, median crossover crashes in the state of Utah do account for a significant proportion of interstate fatalities. Due to the seriousness of median crossover crashes in the state of Utah, the need exists to evaluate the impact of median crossover crashes in the state, to identify locations where median crossover crashes may be occurring at particularly high rates, and to identify methods to help mitigate these crashes. Previous research has noted that median crossover crash rates appear to increase in the vicinity of interchanges. The purpose of this research, therefore, …
Pile Downdrag During Construction Of Two Bridge Abutments, Brian Keith Sears
Pile Downdrag During Construction Of Two Bridge Abutments, Brian Keith Sears
Theses and Dissertations
Two steel pipe piles in place in abutments for two different bridge constructions sites were instrumented with strain gauges to measure the magnitude of negative skin friction. The piles were monitored before, during and up to 19 months after construction was completed. The load versus depth and time in each pile is discussed. Maximum observed dragloads ranged from 98 to 127 kips. A comparison with two methods for calculating dragloads is presented. Both comparison methods were found to be conservative, with the Briaud and Tucker (1997) approach more closely estimating the observed load versus depth behavior.
Effects Of Environmental Factors On Construction Of Soil-Cement Pavement Layers, John E. Michener
Effects Of Environmental Factors On Construction Of Soil-Cement Pavement Layers, John E. Michener
Theses and Dissertations
The specific objectives of this research were to quantify the effects of certain environmental factors on the relative strength loss of soil-cement subjected to compaction delay and to develop a numerical tool that can be easily used by engineers and contractors for determining a maximum compaction delay time for a given project. These objectives were addressed through extensive laboratory work and statistical analyses. The laboratory work involved testing an aggregate base material and a subgrade soil, each treated with two levels of cement. Environmental factors included in the experimentation were wind speed, temperature, and relative humidity, and three levels of …
Fish Passage At Udot Culverts: Prioritization And Assessment, Aaron Evens Beavers
Fish Passage At Udot Culverts: Prioritization And Assessment, Aaron Evens Beavers
Theses and Dissertations
State Departments of Transportation are becoming more involved in providing Aquatic Organism Passage (AOP) at road-stream crossings. Department of Transportation (DOT) emphasis on AOP has been driven largely in response to endangered species listings, other agencies' initiatives, and the desire to restore ecosystem connectivity to watercourses. UDOT is currently responsible for approximately 47,000 culverts, but AOP is currently addressed only on an as-needed basis. Currently UDOT has no prioritization or assessment strategy procedure for AOP at UDOT road-stream crossings. Historical fish passage strategies have focused on federally listed adult anadromous salmon and trout. These are generally very large fish whose …
Localized Coarsening Of Conforming All-Hexahedral Meshes, Adam C. Woodbury
Localized Coarsening Of Conforming All-Hexahedral Meshes, Adam C. Woodbury
Theses and Dissertations
Finite element mesh adaptation methods can be used to improve the efficiency and accuracy of solutions to computational modeling problems. For many finite element modeling applications, a conforming all-hexahedral mesh is preferred. When adapting a hexahedral mesh, localized modifications that preserve topologic conformity are often desired. Effective hexahedral refinement methods that satisfy these criteria have recently become available. However, due to hexahedral mesh topology constraints, little progress has been made in the area of hexahedral coarsening. This thesis presents a new method to locally coarsen conforming all-hexahedral meshes. The method works on both structured and unstructured meshes and is not …
Quantitative Uncertainty Of Chemical Plume Transport In Low Wind Speeds Using Measured Field Data And Stochastic Modeling, Veronica Elaine Wannberg
Quantitative Uncertainty Of Chemical Plume Transport In Low Wind Speeds Using Measured Field Data And Stochastic Modeling, Veronica Elaine Wannberg
Theses and Dissertations
Low wind speed conditions should be studied because these conditions can present risk, particularly for areas immediately surrounding the release point, where high concentrations can occur and not dissipate. The following research attempts to clarify the processes governing both the general and low wind speed cases by determining the accuracy and uncertainty of standard prediction methods for contaminant plume transport in low wind speed plume modeling. Multiple techniques were utilized to incorporate field measured data, previously gathered for a different purpose, to generate parameter distributions and ground-truth data that could be used in stochastic models for chemical plume prediction. These …
A Gis-Based Strategy For Managing Levee Simulation Data, Jeffrey R. Handy
A Gis-Based Strategy For Managing Levee Simulation Data, Jeffrey R. Handy
Theses and Dissertations
Understanding and improving the state of the nation's levees has become a national priority following the devastating events surrounding Hurricanes Katrina and Rita. Federal legislation passed in 2007 created a new national Committee on Levee Safety and spurred the development of the National Levee Database, a central repository of information relating to the location and state of levees across the United States (Water Resources Development Act, 2007). One of the major goals in developing such a database is to improve the safety of America's levees. The National Levee Database, however, does not include features for storing seepage and slope stability …
Ability Of Adv Measurements To Detect Turbulence Differences Between Angular And Rounded Gravel Beds Of Intermediate - Roughness Scale, Benjamin B. Haws
Ability Of Adv Measurements To Detect Turbulence Differences Between Angular And Rounded Gravel Beds Of Intermediate - Roughness Scale, Benjamin B. Haws
Theses and Dissertations
A set of laboratory experiments was carried out to distinguish flow characteristics(bed origin, shear velocity, turbulence intensity, turbulent kinetic energy) between beds of differing gravel angularity. Ten vertical profiles of velocity measurements were taken from angular and rounded fixed gravel beds with a 16 MHz micro acoustic Doppler velocimeter (ADV) sampling at 50 Hz. Both gravel beds had a bottom slope of 0.2% and were in the intermediate - roughness scale. Shear velocities were calculated using three common methods: St Venant, Reynolds stress, and Clauser. The Reynolds stress method resulted in the closest visual match to turbulence distributions proposed by …
Evaluating Shallow-Flow Rock Structures As Scour Countermeasures At Bridges, Benjamin P. Dahle
Evaluating Shallow-Flow Rock Structures As Scour Countermeasures At Bridges, Benjamin P. Dahle
Theses and Dissertations
The Utah Department of Transportation commissioned a study to determine whether or not shallow-flow rock structures could reliably be used at bridge abutments in place of riprap. Research was conducted in a two-phase effort beginning with numerical modeling and ending with field verification of model findings. As part of phase one, two finite element meshes were created in Surface-water Modeling Software (SMS) and analyzed with FESWMS-2DH. Second, field studies were conducted and a preliminary database was developed to track field studies conducted on 98 shallow-flow rock structures in Utah. Data organization in ArcGIS® and Microsoft Access® is presented followed by …
Freeze-Thaw Durability Of Pervious Concrete, Carson B. Demille
Freeze-Thaw Durability Of Pervious Concrete, Carson B. Demille
Theses and Dissertations
Although the use of pervious concrete is expanding, only a limited number of scholarly papers have been published on the resistance of pervious concrete to deterioration under frost action. Based on this need for additional research on the durability of pervious concrete in cold regions, the objective of this research was to evaluate the resistance of pervious concrete to degradation during freeze-thaw cycling under different soil clogging and water saturation conditions. The laboratory research associated with this project involved three primary measures of pervious concrete performance, including freeze-thaw durability, compressive strength, and permeability. Testing associated with freeze-thaw durability involved two …
Development Of A Particle Flow Test For Rotational Molding, Russell B. Whatcott
Development Of A Particle Flow Test For Rotational Molding, Russell B. Whatcott
Theses and Dissertations
One of the current testing method (the Dry Flow test) to qualify resin for use in production in the rotomolding process has been shown to have many flaws in both equipment and procedure. Research was done here to investigate a possible alternative that could eliminate some of these testing deficiencies. By reducing equipment and operator errors, the testing of materials becomes more valuable of an exercise. The Angular Flow test developed in this research can increase repeatability. By coming to understand the rotational molding process better, an evaluation that can give more valid information was devised.
The Study Of Superintendent Training And Its Effects On Homebuilding Cycle Time, John Wesley Burk
The Study Of Superintendent Training And Its Effects On Homebuilding Cycle Time, John Wesley Burk
Theses and Dissertations
This study was conducted to determine how much time would be saved in the homebuilding cycle when field superintendents received training. The study took place during the 2007 calendar year with a production homebuilder in southern Nevada. New technologies and techniques were introduced during weekly training meetings that were held at both the corporate office and construction job sites. A scheduling tool was introduced along with new procedures and policies. The superintendents were required to report daily on the tasks that had been completed. This gave the superintendent and upper management the ability to follow the home throughout the building …
Development And Characterization Of Friction Bit Joining: A New Solid State Spot Joining Technology Applied To Dissimilar Al/Steel Joints, Brandon Raymond Siemssen
Development And Characterization Of Friction Bit Joining: A New Solid State Spot Joining Technology Applied To Dissimilar Al/Steel Joints, Brandon Raymond Siemssen
Theses and Dissertations
Friction bit joining (FBJ) is a new solid-state spot joining technology developed in cooperation between Brigham Young University of Provo Utah, and MegaStir Technologies of West Bountiful Utah. Although capable of joining several different material combinations, this research focuses on the application of FBJ to joining 5754 aluminum to DP 980 steel, two alloys commonly used in automotive applications. The thicknesses of the materials used were 0.070 inches (1.78 mm) and 0.065 inches (1.65 mm), respectively. The FBJ process employs a consumable 4140 steel bit and is carried out on a purpose built research machine. In the first stage of …
Evaluation Of Laboratory Durability Tests For Stabilized Subgrade Soils, John Wesley Parker
Evaluation Of Laboratory Durability Tests For Stabilized Subgrade Soils, John Wesley Parker
Theses and Dissertations
The Portland Cement Association commissioned a research project at Brigham Young University to compare selected laboratory durability tests available for assessing stabilized subgrade materials. Improved understanding of these tests is needed to enable more objective selection of durability tests by design engineers and to facilitate more meaningful comparisons of data obtained for different stabilizer treatments using different evaluation procedures. The laboratory research associated with this project involved two subgrade materials, four stabilizers at three concentrations each, and three durability tests in a full-factorial experimental design. The two subgrade soils used were a silty sand and a lean clay, while the …
Impact Of Jet Grouting On The Lateral Strength Of Soil Surrounding Driven Pile Foundations, Matthew E. Adsero
Impact Of Jet Grouting On The Lateral Strength Of Soil Surrounding Driven Pile Foundations, Matthew E. Adsero
Theses and Dissertations
Jet grouting was used to strengthen the soft soil surrounding the piles and the pile cap of two full-scale driven pile foundations. Soilcrete columns, created by jet grouting, were placed underneath the pile cap and surrounding the piles of the first foundation. Two rows of soilcrete columns were placed around the perimeter of one-side of the second. All of the jet grouting took place after construction of the pile caps. Laboratory testing of the soilcrete slurry showed the columns as having a design unconfined compressive strength of 550-650 psi, compared with the native soil strength of only 6-8 psi (850-1150 …
Nrcs Curve Number Calibration Using Usgs Regression Equations, Charlotte M. Mecham
Nrcs Curve Number Calibration Using Usgs Regression Equations, Charlotte M. Mecham
Theses and Dissertations
The Curve Number (CN) method of estimating the direct runoff response to rainfall events was originally developed in the 1950's primarily for agricultural purposes in the mid-western United States. The accuracy of the CN method is greatly affected by variation of the soil type and land use of the region. Curve Numbers developed for a given region are not appropriate for application in other regions. In order to produce reliable, consistent results, Curve Numbers must be calibrated for the area in which the CN method is to be applied. Calibration is ideally accomplished by direct measurement using several rain and …
Numerical Analysis Of Passive Force On Skewed Bridgeabutments With Reinforced Concrete Wingwalls, Scott Karl Snow
Numerical Analysis Of Passive Force On Skewed Bridgeabutments With Reinforced Concrete Wingwalls, Scott Karl Snow
Theses and Dissertations
Numerical Analysis of Passive Force on Skewed BridgeAbutments with Reinforced Concrete WingwallsScott Karl SnowDepartment of Civil and Environmental Engineering, BYU Master of Science Historically bridges with skewed abutments have proven more likely to fail during earthquake loadings (Toro et al, 2013) when compared to non-skewed bridges (Apirakvorapinit et al. 2012; Elnashai et al. 2010). Previous studies including small-scale laboratory tests by Jessee (2012), large-scale field tests by Smith (2014), and numerical modeling by Shamsabadi et al. (2006) have shown that 45° skewed bridge abutments experience a reduction in peak passive force by about 65%. With numerous skewed bridges in the …
Impact Of Mass Mixing On The Lateral Resistance Of Driven-Pile Foundations, Mark Alan Herbst
Impact Of Mass Mixing On The Lateral Resistance Of Driven-Pile Foundations, Mark Alan Herbst
Theses and Dissertations
Although it has been established that in-situ soil mixing has improved the bearing capacity of soils, additional research is needed to better understand the effect of soil mixing on lateral resistance of pile caps. To do this, in-situ soil mixing was used to strengthen weak clay adjacent to a pile cap of a driven pile foundation. The mass stabilization method or mass mixing was used to treat an 11 ft wide, 4 ft thick, and 10 ft deep zone consisting of an average 475 psf clay that was adjacent to a 9-pile group in 3x3 pile configuration capped with a …
Liquefaction Mitigation Using Vertical Composite Drains And Liquefaction Induced Downdrag On Piles: Implications For Deep Foundation Design, Spencer R. Strand
Liquefaction Mitigation Using Vertical Composite Drains And Liquefaction Induced Downdrag On Piles: Implications For Deep Foundation Design, Spencer R. Strand
Theses and Dissertations
Deep foundations constructed in liquefiable soils require specialized design. The design engineer of such foundations must consider the effects of liquefaction on the foundation and overlying structure, such as excessive settlement, loss of skin friction at the soil-pile interface, and the development of downdrag on the pile. Controlled blasting was employed to liquefy a loose, saturated sand in order to test the liquefaction prevention capabilities of full-scale, vertical composite earthquake (EQ) drains and to investigate the development of downdrag on full-scale test piles. Blasting produced liquefaction at a test site without EQ drains which eventually resulted in 270 mm of …
Automated Quadrilateral Coarsening By Ring Collapse, Mark William Dewey
Automated Quadrilateral Coarsening By Ring Collapse, Mark William Dewey
Theses and Dissertations
In most finite element analysis, a uniform mesh is not the optimum way to model the problem. Mesh adaptation is the ability to modify a finite element model to include regions of the mesh with higher and lower node density. Mesh adaptation has received extensive study in both computational mechanics and computer graphics to increase the resolution or accuracy of the solution in specific areas. The algorithm developed in this thesis, the Automated Quadrilateral Coarsening by Ring Collapse (AQCRC) algorithm, provides a unique solution to allow conformal coarsening of both structured and unstructured quadrilateral finite element meshes. The algorithm is …
Parallel Processing Of Reactive Transport Models Using Openmp, Jared D. Mclaughlin
Parallel Processing Of Reactive Transport Models Using Openmp, Jared D. Mclaughlin
Theses and Dissertations
Transport codes are beginning to be parallelized in order to allow more complex add-ons, such as geochemical packages, to utilize finer, more accurate grids, and to reduce solution times making stochastic and Monte Carlo simulations more feasible. Most codes parallelized via MPI (message passing interface) offer good results, but require the development of a new parallel code. OpenMP, the shared-memory standard, offers incremental parallelization, allowing sequential codes to remain relatively intact with minimal changes or additions. OpenMP allows speedup to be seen on personal computers with dual processors or greater, unlike some other parallelization approaches that require a supercomputer. An …
Evaluation Of The Applicability Of The Interactive Highway Safety Design Model To Safety Audit Of Two-Lane Rural Highways, Kaitlin Chuo
Evaluation Of The Applicability Of The Interactive Highway Safety Design Model To Safety Audit Of Two-Lane Rural Highways, Kaitlin Chuo
Theses and Dissertations
The Interactive Highway Safety Design Model (IHSDM) is a suite of software developed by the Federal Highway Administration (FHWA) for monitoring and analyzing two-lane rural highways in the United States. As IHSDM is a fairly "young" program a limited amount of research has been conducted to evaluate its practicability and reliability. To determine if IHSDM can be adopted into the engineering decision making process in Utah, a study was conducted under the supervision of the Utah Department of Transportation (UDOT) to evaluate its applicability to audit safety of two-lane rural highways in Utah. IHSDM consists of six modules: Policy Review …
Sedimentological And Biological Analyses On Hobble Creek Prior To Restoration, Jaron Michael Brown
Sedimentological And Biological Analyses On Hobble Creek Prior To Restoration, Jaron Michael Brown
Theses and Dissertations
Hobble Creek is one of several inflowing streams and rivers into Utah Lake, Utah, USA. Historically, June sucker (Chasmistes liorus), a federally listed endemic fish, spawned up all the major inflowing streams and rivers but is now limited to just the Provo River. The State of Utah has recently proposed restoring the lower reaches of Hobble Creek for additional spawning and rearing needs. This restoration effort will likely involve removal of migration barriers, re-aligning the stream, and removing existing levees that prevent floodplain access. These changes have raised several questions that this study aims to answer. First, what are the …