Title page for ETD etd-11092006-115814


Type of Document Master's Thesis
Author Nair, Archana
URN etd-11092006-115814
Title Acoustic Emission Monitoring and Quantitative Evaluation of Damage in Reinforced Concrete Members and Bridges
Degree Master of Science in Civil Engineering (M.S.C.E.)
Department Civil & Environmental Engineering
Advisory Committee
Advisor Name Title
C. S. Cai Committee Chair
Ayman M. Okeil Committee Member
R. Richard Avent Committee Member
Keywords
  • bridges
  • intensity analysis
  • acoustic emission
  • reinforced concrete
Date of Defense 2006-10-25
Availability unrestricted
Abstract
A considerable proportion of highway bridges in the US, are made of reinforced concrete. The vulnerability of these structures during their long service life is a cause of major concern for civil engineers. Since there is a need to detect and recuperate the condition of the bridge structures numerous innovative non-destructive testing (NDT) techniques have come into the forefront. Of the many available technologies, acoustic emission (AE) monitoring has been the most popular non-destructive technique used on highway bridges.

Acoustic emission is a passive monitoring technique. Thus, it can be appropriately used for field bridge monitoring applications. Usually AE monitoring is used to obtain qualitative results by observing the trends of the conventional AE parameters recorded by the data acquisition system. The extent of damage is then determined using other NDT techniques. The current study aims at applying the intensity analysis technique of damage quantification to conventional AE parameters generated from reinforced concrete members. A few reinforced concrete beams are subjected to varied cyclic load patterns in the laboratory to study the trends that may be observed in the intensity chart during damage propagation. The results thus obtained are then compared to other prevalent damage assessment techniques as well. Additionally, AE data collected from two field bridge tests are also subjected to intensity analysis technique of damage quantification to evaluate the practical viability of the technique in assessing the severity of the damage in the monitored structures.

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