Modal based Structural Health Monitoring (SHM) systems are often applied to detect structural ageing, degradation phenomena and damage due to hazardous events. However, the modal property estimates are also influenced by environmental and operational variables (EOVs) whose effects can hide damage. Direct modeling of the influence of EOVs on the modal characteristics of a structure is difficult, so black-box models are usually adopted as an alternative to map the changes of the modal properties with the EOVs. In particular, output-only techniques are particularly attractive when the set of measured EOVs is incomplete or the factors influencing the estimates cannot be clearly identified or measured. The present paper presents the results of some analyses aimed at identifying relevant EOVs and assessing their influence on the estimated natural frequencies of a hospital building through output-only techniques. © 2019 International Group of Operational Modal Analysis.

Analysis of the environmental influence on natural frequencies of a hospital building

Rainieri, C.;Fabbrocino, G.;
2019-01-01

Abstract

Modal based Structural Health Monitoring (SHM) systems are often applied to detect structural ageing, degradation phenomena and damage due to hazardous events. However, the modal property estimates are also influenced by environmental and operational variables (EOVs) whose effects can hide damage. Direct modeling of the influence of EOVs on the modal characteristics of a structure is difficult, so black-box models are usually adopted as an alternative to map the changes of the modal properties with the EOVs. In particular, output-only techniques are particularly attractive when the set of measured EOVs is incomplete or the factors influencing the estimates cannot be clearly identified or measured. The present paper presents the results of some analyses aimed at identifying relevant EOVs and assessing their influence on the estimated natural frequencies of a hospital building through output-only techniques. © 2019 International Group of Operational Modal Analysis.
978-840904900-4
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11695/92263
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