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• W566163692 abstract "This final report consists of two dissertations for the doctor of philosophy degree. The first (designated Part 1) was prepared by Helsin Wang in December 2004. It contains six chapters. Chapter 1 is an introduction. Chapter 2 presents the fundamentals of wave propagation with emphasis on waveguides and summarizes different type of guided waves. Chapter 3 summarizes numerical analysis methods used in developing solutions to the dispersion equations, assumptions for material properties, and values of material properties for concrete and soil used herein. Chapter 4 develops the solutions for guided waves propagating in an embedded plate-like concrete structure. Chapter 5 describes the solution for the flexural mode waves propagating in an embedded solid cylindrical concrete structure. Chapter 6 summarizes this thesis and presents conclusions related to the Rayleigh-Lamb waves propagating in an embedded plate-like concrete structure and flexural mode waves propagating in an embedded solid cylindrical concrete structure. The second dissertation (designated Part 2) was prepared by James J. Lynch, Jr., in December 2007. It encompasses eight chapters. Chapter 1 is an introduction. Chapter 2 summarizes the conventional sonic echo and impulse response methods for nondestructive evaluation of deep foundations, presents details of the structures by which the lateral impact method and flexural controlled frequency method are to be verified, and presents the governing equation for three dimensional wave propagation within a cylindrical waveguide and solutions of the flexural modes. Chapter 3 describes the test procedures, test equipment, and analytical procedures used in the experimental program. Chapter 4 describes the prototype pile evaluated by the impact and shaker methods. Chapter 5 presents the results of lateral impact tests performed on the new prototype pile under traction-free conditions and embedded conditions, as well as the results of lateral impact tests performed on two existing prototype piles under embedded conditions to verify the guided wave theory presented in Chapter 2. Chapter 6 presents the flexural controlled frequency results for the prototype pile under traction-free conditions to verify the guided wave theory presented in Chapter 2 for the higher frequencies generated in the flexural controlled frequency tests. Chapter 7 presents the flexural controlled frequency results for the prototype pile and two existing prototype piles embedded in very loose sand to verify the guided wave theory presented in Chapter 2. Chapter 8 summarizes the work presented in this thesis, presents conclusions regarding the applicability of guided wave theory for nondestructive evaluation of deep foundations, and provides recommended test procedures and analytical methods." @default.
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• W566163692 date "2009-01-01" @default.
• W566163692 modified "2023-09-27" @default.
• W566163692 title "Concrete Evaluation Using Guided Waves: (Part 1) Theoretical Evaluation of Embedded Plate-Like and Solid Cylindrical Concrete Structures with Guided Waves; (Part 2) Experimental Evaluation of Concrete Piles Subjected to Flexural Guided Waves" @default.
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