Localização de danos em vigas de concreto armado considerando o comportamento dos modos de vibração

Abstract

Structural Health Monitoring is a system used to periodically assess the integrity of civil structures, where modal dynamic analysis may be applied to detect stiffness differences through oscillatory modal parameters. Interest literature suggests that the correlation analysis of the mode shapesusing coefficients such as MAC and COMACis not always capable of satisfactorily detecting and locating damage. The present study, however, inferring about the used quality data to define these coefficients and about further analysis steps, intends to suggest the efficiency of locating damage, mainly considering the COMAC coefficient. By means of finite element analysis, using the computational software Ansys, modal analyses were developed to a small size reinforced concrete beam. Losses of concrete on the cross sections due to physical deterioration were considered in 4 different cases. It is shown that this approach has significant accuracy in locating damage, depending on the discretization of the evaluated data and on the usage of post processing mathematical steps.