Author(s)

L Fjba, M. Pirner, S. Urushadze

Abstract

Three methods for the localization of imperfections or damages in concrete structures were developed and applied in laboratory conditions: COMAC, CAMOSUC and SEM. They are based on hammer blow method, modal analysis and on the special evaluation methods. These non-destructive approaches enable us to estimate the position of imperfections in structures, like the failures due to repeated loads that appear in fatigue tests. Furthermore, they facilitate to determine the inspection intervals and to estimate the residual life of structures. 1 Introduction The application of changes of the dynamic characteristics of structures, like natural frequencies, forms of natural vibrations, damping, etc., to the detection of imperfections and damage arose some years ago, see Natke [1]. A rapid progress in e

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