Browsing Electronic Theses and Dissertations by Department "Civil Engineering"
Now showing items 41-60 of 101
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(2019-05-23)Department: Civil EngineeringEngineering systems following disruptive events usually experience abrupt performance degradation over time. How to mitigate the disastrous effect of unanticipated events and restore the performance of the system to the ...
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Machine Learning Based Prediction and Classification of Properties of Engineered Composite Materials (2020-04-03)Department: Civil EngineeringIn an engineered composite material, the behavior of different phases and their interactions determine the response of the material as a whole. Data-driven machine learning techniques have emerged as a promising tool for ...
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(2012-07-24)Department: Civil EngineeringThis dissertation develops a systematic and comprehensive approach to management of uncertainty by accomplishing four major objectives: address model uncertainty for the permanent deformation model, develop a method to ...
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(2015-11-13)Department: Civil EngineeringThis dissertation presents a computational framework for the formulation and implementation of an Extended Finite Element Method (XFEM) for random short fiber reinforced composite materials. XFEM is used to eliminate the ...
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(2021-09-20)Department: Civil EngineeringThe frequency and severity of disasters has recently amplified and is expected to further increase due to climate change, population growth, increasing coastal density, and inadequate disaster preparedness. An opportunity ...
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(2005-12-07)Department: Civil EngineeringFull-scale testing of large engineering systems for assessing performance could be infeasible and expensive. With the growth of advanced computing capabilities, model-based simulation plays an increasingly important role ...
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(2010-08-02)Department: Civil EngineeringThe role of uncertainty management is increasingly being recognized in the design of complex systems that require multi-level multidisciplinary analyses. Most previous studies in this direction have only dealt with aleatory ...
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(2013-09-18)Department: Civil EngineeringOne of the defense related research programs of recent interest is focused on developing ultra-high strength concrete (UHSC) mixtures and lightweight, rapidly deployable protective structures. A goal of these research ...
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(2020-11-13)Department: Civil EngineeringDegradation of materials poses a significant threat to the safety and stability of both man-made and natural materials and structures, and is generally driven by coupled chemical and physical processes. Complementary to ...
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(2008-04-14)Department: Civil EngineeringAnalytical and experimental approaches to determine mixed-mode fatigue crack growth threshold and growth rates are not well established and remain an active research topic. This dissertation compared the existing methods ...
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Modeling the Failure Behavior of Composite Bolted Joints Subjected to Monotonic Loading Conditions (2017-03-27)Department: Civil EngineeringComposite materials are attractive for aerospace vehicles due to their low weight and high performance; however, predictive computational models are needed to lower the costs associated with their design and certification ...
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(2012-10-05)Department: Civil EngineeringThe modeling and risk management of fatigue crack growth is a problem of critical importance in any mechanical system. The work presented in this study demonstrates two efficient methods for the modeling of non-planar ...
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(2019-04-02)Department: Civil EngineeringThis dissertation develops a novel approach for fusing information from physics models of different levels of fidelity in the Bayesian estimation of system parameters. In order to balance computational effort and accuracy, ...
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(2016-03-07)Department: Civil EngineeringThis study proposes an optimization framework to include different sources of uncertainty in the design of multidisciplinary analysis with feedback coupling. To achieve this goal, four objectives were pursued, two related ...
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(2019-02-21)Department: Civil EngineeringPeriodic composites with tailored microstructures and material properties such as phononic crystals and acoustic metamaterials exhibit extraordinary capabilities in controlling elastic waves by manipulating band gaps that ...
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(2022-08-14)Department: Civil EngineeringThe dissertation develops a new reduced order homogenization model named “multiscale discrete damage theory” (MDDT) for failure analysis of composite materials. MDDT adopts discrete representation of fracture process within ...
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(2012-08-13)Department: Civil EngineeringThis dissertation presents a novel multiscale computational framework for simulating failure and damage accumulation in brittle composites. A reduced-order multiple spatial scale methodology is developed to efficiently ...
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(2014-07-22)Department: Civil EngineeringThis research proposes a computational framework of the dynamic response of composite structures based on the mathematical homogenization theory with multiple spatial scales. The computational framework serves to reproduce ...
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(2013-04-16)Department: Civil EngineeringThe use of short, randomly distributed fibers in cement-based composites has improved properties and allowed for multifunctional capabilities such as the ability to sense damage. Because flaws exist in cement-based composites ...
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(2019-11-22)Department: Civil EngineeringThe nanoengineering of the mechanical properties of crystalline calcium-silicate-hydrates (i.e., tobermorite 9 Å (T9) and 14 Å (T14)) using single-layer graphene sheets (GS) as nanoreinforcement was studied. The effects ...