Structural health monitoring for layered structure using transmissibility functions

Abstract

In this study, we proposed a structural health monitoring and diagnosis method using the frequency response function between layers of a layered structure, that is, the transmissibility function. The method focuses on the fact that the transmissibility function of the top floor when the ceiling or foundation of the first floor of a layered structure is vibrated in the horizontal direction is constructed only with the characteristics of the top floor, and in the case of the lower floor, the function is constructed only with the characteristics of the interested floor. To verify the validity of the proposed method, we considered a three-layer structure as a numerical example. To compare the identification accuracy, the characteristic parameters were also identified by the sensitivity analysis method. As a result, correct diagnosis is possible with either method, but the method using the proposed transmissibility function is effective for early detection of local abnormalities, and the sensitivity analysis method was found to be effective when multiple abnormalities have occurred.