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Full-Text Articles in Engineering

Systems Approaches To Transdisciplinary Sustainable Development Issues, David Lawrence Zelinka Jan 2019

Systems Approaches To Transdisciplinary Sustainable Development Issues, David Lawrence Zelinka

Civil Engineering Graduate Theses & Dissertations

The goals of this dissertation are twofold. The first is to advance the discipline of sustainability science through the application of systems-based tools (primarily system dynamics) and civil engineering principles. Sustainability science is fundamental to implementing effective strategies for progressing sustainable development and improving human well-being around the planet, but it is still not fully developed as a science and needs new methods and approaches due to the field’s inherent interdisciplinarity and complexity. Civil engineering as a foundation provides mathematical knowledge, computer modeling skills, and a wide breadth of technical understanding, but it lacks the societal, political, and economic ...


Studies Of Earthquake Pounding Risk And Of Above-Code Seismic Design, Moad Isteita Jan 2019

Studies Of Earthquake Pounding Risk And Of Above-Code Seismic Design, Moad Isteita

Civil Engineering Graduate Theses & Dissertations

This thesis tests three hypotheses: (1) Some US practice to determine the required separation distance to preclude pounding between neighboring buildings is overly conservative. (2) Pounding between buildings with aligned floors significantly contributes to collapse. (3) Above-code design of a common engineered commercial building type is cost effective in many though perhaps not all US locations, at least from a benefit-cost-analysis perspective.

The first part of this thesis reexamines the required minimum permissible space between two adjacent buildings to preclude earthquake pounding. This part of the thesis employs and compares three analytical approaches to estimate the minimum safe distance conditioned ...


Sustainable Sanitation Systems: Understanding Priorities, Processes, And Pathways To Success, Allison Davis Jan 2019

Sustainable Sanitation Systems: Understanding Priorities, Processes, And Pathways To Success, Allison Davis

Civil Engineering Graduate Theses & Dissertations

Despite the unprecedented time, attention, and finances dedicated to increasing global access to sanitation, sanitation systems continue to fail at unacceptably high rates. Sanitation failure is a global concern, especially due to diminished public and environmental health and heightened economic costs. A commonly cited reason for sanitation failure is the selection of inappropriate technologies that do not address local priorities. To further evaluate this possible reason for failure, this dissertation employed a multi-method approach in 20 resource-limited communities in southern India with small-scale sanitation systems. Since sanitation priorities are mostly unknown, this research first focused on how to best identify ...


Performance Of Inelastic Structures On Mitigated And Unmitigated Liquefiable Soils: Evaluation Of Numerical Simulations With Centrifuge Tests, Jenny Zulay Ramirez Calderon Jan 2019

Performance Of Inelastic Structures On Mitigated And Unmitigated Liquefiable Soils: Evaluation Of Numerical Simulations With Centrifuge Tests, Jenny Zulay Ramirez Calderon

Civil Engineering Graduate Theses & Dissertations

A series of dynamic centrifuge experiments involving soil-foundation-mitigation-structure (SFMS) interaction on liquefiable soils are used to evaluate the ability of state-of-the-art numerical modeling in reliably predicting system performance (e.g., in terms of foundation settlement, rotation, roof accelerations, and column strains). This research comprises of two major components: (1) calibration and validation of two soil constitutive models with a series of fully drained and undrained, monotonic and cyclic, triaxial tests as well as a free-field centrifuge test on a layered, liquefiable soil deposit (without a building or a mitigation technique); and (2) numerical simulation of centrifuge tests that include multi-degree-of-freedom ...


Leveraging Emotional Engagement Techniques And Adult Learning Principles To Transform Safety Training, Siddharth Bhandari Jan 2019

Leveraging Emotional Engagement Techniques And Adult Learning Principles To Transform Safety Training, Siddharth Bhandari

Civil Engineering Graduate Theses & Dissertations

Safety training despite being the key measure to keeping workers safe within any occupational environment has not kept pace with the significant advancement in the fields of behavioral psychology and education. As a result, researchers have found that the pre-dated safety training techniques on construction sites fail in communicating information in a way that promotes long-term retention of knowledge among adult learners and they also end up generating a negative attitude towards safety among workers. Understanding the psychological antecedents to risk-taking behavior and utilizing prominent adult learning theories to revolutionize safety training could allow academics and practitioners to improve workers ...


Predicting Construction Safety Performance, Wael Muqhim Alruqi Jan 2019

Predicting Construction Safety Performance, Wael Muqhim Alruqi

Civil Engineering Graduate Theses & Dissertations

Researchers and leading industry practitioners have turned to proactive safety metrics, such as safety leading indicators and safety climate, as predictors of future safety performance. Current academic research shows that the relationships between safety leading indicators and safety lagging indicators remain inconsistent, as well as the relationships between the dimensions of safety climate and safety performance. In addition, prior studies have measured the predictive capacity of these constructs separately even though they are logically associated with one another. Standardizing the measurement of proactive safety metrics and understanding how they relate to one another may facilitate consistency among the indicators or ...


Strong Form Meshfree Collocation Method For Higher Order And Nonlinear Pdes In Engineering Applications, Andrew Christian Beel Jan 2019

Strong Form Meshfree Collocation Method For Higher Order And Nonlinear Pdes In Engineering Applications, Andrew Christian Beel

Civil Engineering Graduate Theses & Dissertations

The strong form meshfree collocation method based on Taylor approximation and moving least squares is an alternative to finite element methods for solving partial differential equations in engineering applications. This study examines how the proposed alternative method solves (i) higher-order and (ii) nonlinear partial differential equations. First, the proposed method is formulated in Chapter 2 for the general discretization and solution of strong forms of partial differential equations. Chapter 3 presents the convergence and error behavior of the proposed method for the fourth-order Stommel-Munk equation for wind-driven ocean circulation, as well as the numerical solution of this equation on a ...


Properties Of Nevada Sand Under Monotonic, Sinusoidal, And Irregular Loading, David Allen Provost Jan 2019

Properties Of Nevada Sand Under Monotonic, Sinusoidal, And Irregular Loading, David Allen Provost

Civil Engineering Graduate Theses & Dissertations

This study involved an investigation into the properties of Nevada sand under monotonic, cyclic sinusoidal, and irregular cyclic loading. The study also was used to determine the capabilities of the new Wille Geotechnik triaxial press that was purchased for use at the University of Colorado Boulder. The properties of Nevada sand are important to understand for the ongoing seismic research being conducted at CU Boulder, specifically for the calibration of numerical models to simulate the results of centrifuge testing. There had been previous work completed by others to define the monotonic and cyclic sinusoidal response of the soil, but the ...


Diagnosing Drivers Of Reservoir Sedimentation In The Western Us: A Case Study Of Prineville Reservoir, Oregon, Leah Clare Bensching Jan 2019

Diagnosing Drivers Of Reservoir Sedimentation In The Western Us: A Case Study Of Prineville Reservoir, Oregon, Leah Clare Bensching

Civil Engineering Graduate Theses & Dissertations

There is great need to quantify reservoir storage loss due to sediment. Less than 1% of reservoirs in the US have more than one volume survey. Due to the lack of frequent data collection, a constant rate sediment yield from year to year is often assumed. This study aims to explore the following questions: 1) Can hydrologically-forced sediment algorithms help us advance reservoir sedimentation estimates to improve future planning? 2) To which processes and inputs are reservoir sedimentation estimates most sensitive? 3) What can we learn from models that the linear sediment accumulation assumption fails to assess? It will address ...


Informing Many-Objective Decision-Making For Water Rights Allocations And Trading Dynamics Conditioned On A Streamflow Prediction Regime In The Elqui River Basin, Melissa A. Estep Jan 2019

Informing Many-Objective Decision-Making For Water Rights Allocations And Trading Dynamics Conditioned On A Streamflow Prediction Regime In The Elqui River Basin, Melissa A. Estep

Civil Engineering Graduate Theses & Dissertations

The Elqui Valley in northern Chile faces increasing water stress due to a growing agricultural sector. This study evaluates how improvements in season-ahead forecasting skill and changes in water rights trading dynamics impact the ability for seasonal reservoir management to meet the water needs of various actors in the basin. By establishing a baseline forecast of perfect foresight of observed streamflow data, the analysis evaluates how the use of an updated forecasting technique compares to climatology in its ability to meet management needs. Using the RiverWare river system modeling tool, multiple scenarios representing different suites of trade and reservoir operating ...


Mechanical And Durability Properties Of Concrete Under Low Temperatures, Yao Wang Jan 2019

Mechanical And Durability Properties Of Concrete Under Low Temperatures, Yao Wang

Civil Engineering Graduate Theses & Dissertations

Frost attack can heavily damage concrete materials and concrete structures. Therefore, it is important to predict the service life of concrete structures considering the effect of the deterioration process. A theoretical model based on Mori-Tanaka micromechanics method was developed to estimate the deterioration of elastic properties of concrete under low temperatures. The model took into account a continuous pore size distribution for cement paste, freezing temperatures with different pore sizes, and damage development in cement paste. The model was able to characterize the stiffening effect due to the formation of solid ice and the weakening effect of the damage development ...


Centrifuge Modeling Of Dense Granular Columns In Layered Liquefiable Soils With Varying Stratigraphy And Overlying Structures, Mahir A. Badanagki Jan 2019

Centrifuge Modeling Of Dense Granular Columns In Layered Liquefiable Soils With Varying Stratigraphy And Overlying Structures, Mahir A. Badanagki

Civil Engineering Graduate Theses & Dissertations

Soil liquefaction and ground failure have been a major source of damage to slopes, embankments, and structures during previous earthquakes. The risk of liquefaction and associated ground deformations can be reduced by various forms of improvement, including the granular column technique. Granular columns are known to be cost effective and environmentally friendly, and they have been in use since the 1970’s to mitigate the liquefaction hazard. Granular columns mitigate the consequences of soil liquefaction through a combination of: 1) installation-induced ground densification, 2) increase in lateral effective stresses in the surrounding soil, 3) increase in shear stiffness, and 4 ...