Investigations Into Non-Destructive Methods of Structural Testing Using Finite Element Models


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The research described in this thesis is concerned with the investigation of Non-destructive Methods of Structural Testing using Finite Element Models. Non-Destructive methods of structural testing have growing popularity in their application to the quality control of buildings and structures. Reports on successful applications of the methods are widespread. In this research, the finite element models are used as a tool to investigate the theories behind the non-destructive testing methods. The non-destructive testing methods considered are the earth resistance method, the sonic echo method and the
vibration methods of pile testing. Finite element simulations are used to investigate the sensitivity of the testing methods in detecting a defect in a structural member under an ideal situation. Finite element models are used to represent a pile, a beam or a column. The application of the finite element
simulations to the interpretation of the field test data from non-destructive tests is shown. The prediction of the behaviour of a structure or a structural member using the finite element models is also discussed.
Revealing the shortcomings in the application of the testing methods, some suggestions to modify the operation of the testing methods have been made. Studies on the application of the sonic echo method of testing structural members have lead to an investigation into its application for the assessment of the integrity of brickwork columns and an idealised masonry bridge. The study has shown that the propagation of a sonic pulse in a brickwork structural member may be considered to be the same as the propagation of the sonic pulse in an homogeneous, anisotropic structural member. The velocity of propagation of a sonic pulse in media such as brickwork may be found from the elastic properties of the constituent materials.

Content:-
Acknowledgments
Abstract
Volume 1
Chapter 1: Introduction
Chapter 2: In-Situ Test Methods
Chapter 3: Simulation Methods
Chapter 4: Finite Element Formulation
Chapter 5: A Finite Element Simulation of the Resistivity Method for Non-Destructive Testing of Reinforced Concrete Piles
Chapter 6: Finite Element Modelling of the Sonic Echo Method of Testing Reinforced Concrete Structural Members
Chapter 7: Finite Element Modelling of the Sonic Echo Method of Testing Masonry Structures
Chapter 8: Studies on Vibration Methods of Non-Destructive Testing
Chapter 9: General Conclusions and Future Developments
Appendix A: Derivative of the Admittance Relationships for 20-node Isoparametric Finite Element
Appendix B:
Derivation of the Stiffness Relationships for 8-node Isoparametric Element
Appendix C: Flow Charts for Main AnalVsis Programs
Appendix D: The Application of the Resistivity Method on the Site Investigation in Abandoned
Mineworkings
Appendix E: Steady State Vibration Test Results
List of Published Work

Author Details
"FUK-LUN ALEXANDER WONG" 
B. Sc. A thesis submitted for the Degree of 
Doctor of PhilosophV
UNIVERSITY OF EDINBURGH



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