By Sotirios J. Vahaviolos
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Additional info for Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353)
8 High 37 38 ACOUSTICEMISSION: STANDARDS AND TECHNOLOGY high AE activity during untoadings correspond to the occurrence of serious damage such as the slip between the reinforcement and concrete or that between the repaired part and the original concrete. Therefore, they can be effective indices to estimate the level of deterioration. An example of evaluation criteria for damage induced in RC beams is given in Table 3. As demonstrated, the CBI ratio and the AE activity during unloadings, which can be obtained under repeated loadings with increasing maximum loads, are very useful for evaluating structural integrity of RC beams.
AE provides a method to screen these structures in a relatively quick manner without significant loss of service time. UW Research Program Field Testing Because of the question concerning how much the in-plane and out-of-plane vibrations contribute to the connection fatigue damage, the initial focus of the research will be to determine the actual dynamic movements that typical poles have in service. Two 50-ft cantilever poles, currently in service in Laramie, WY, have experienced large amplitude vibrations under windy conditions, and will initially be monitored for several months to determine the direction and magnitude of the vibrations.
6-Relationships between A E hits and the applied load for the specimens with different deteriorated levels; (a)specimen with no corrosion damage, (b)deteriorated specimen (crack width 1 mm), (c)deteriorated specimen (crack width 4 ram). YUYAMA ET AL. ON REINFORCED CONCRETE BEAMS TABLE 2-Concrete Beam Integrity (CBI) ratios for the second and the third loadings. 10 CBI ratios for the second and the third loadings are summarized in Table 2. It is obvious that the CBI ratios exhibit smaller values than Case 1 because of the breakdown of the Kaiser effect during the second loading in the deteriorated specimens.
Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353) by Sotirios J. Vahaviolos