Structural monitoring of strategic buildings is an important tool for the identification of dynamic characteristics changes caused by an earthquake, of primary interest to prevent potential damage due to future seismic events or even to assess the capability of a seismic retrofit to the damaged structure. Recent studies have shown how these variations can be assessed with special focus on the permanent and transient decrease of the main frequency during ground shaking. In this work, we analyzed three data set acquired on one building of the University of Ferrara (Emilia Romagna Region, Northern Italy). Ambient noise surveys were performed at each floor of the building: the first data set was acquired few months before the earthquake that struck the Emilia region on May 20, 2012; the second was acquired right after the earthquake, when the building showed slight damage; finally, the third data set was acquired in 2016, after the repair of seismic damage occurred to non-structural components. The analysis of those data sets highlighted the permanent drop of the building main frequency after the earthquake due to damage, with its partial recovery after the repair of seismic damage. This study demonstrates that building monitoring, even with low-cost instruments, allows understanding if and how the building main frequency changes due to an earthquake, providing a preliminary assessment of possible damage. Low-cost monitoring systems can therefore be considered a valuable prevention and monitoring tool for structures.

Ambient vibration tests on a building before and after the 2012 Emilia (Italy) earthquake

Nasser ABU-ZEID
Data Curation
;
Samuel BIGNARDI
Data Curation
;
2018

Abstract

Structural monitoring of strategic buildings is an important tool for the identification of dynamic characteristics changes caused by an earthquake, of primary interest to prevent potential damage due to future seismic events or even to assess the capability of a seismic retrofit to the damaged structure. Recent studies have shown how these variations can be assessed with special focus on the permanent and transient decrease of the main frequency during ground shaking. In this work, we analyzed three data set acquired on one building of the University of Ferrara (Emilia Romagna Region, Northern Italy). Ambient noise surveys were performed at each floor of the building: the first data set was acquired few months before the earthquake that struck the Emilia region on May 20, 2012; the second was acquired right after the earthquake, when the building showed slight damage; finally, the third data set was acquired in 2016, after the repair of seismic damage occurred to non-structural components. The analysis of those data sets highlighted the permanent drop of the building main frequency after the earthquake due to damage, with its partial recovery after the repair of seismic damage. This study demonstrates that building monitoring, even with low-cost instruments, allows understanding if and how the building main frequency changes due to an earthquake, providing a preliminary assessment of possible damage. Low-cost monitoring systems can therefore be considered a valuable prevention and monitoring tool for structures.
2018
Structural health monitoring; Microtremors; HVSR; Emilia earthquake; Non-structural damage
File in questo prodotto:
File Dimensione Formato  
16ecee_june_2018_paper_10242.pdf

accesso aperto

Descrizione: versione editoriale
Tipologia: Full text (versione editoriale)
Licenza: PUBBLICO - Pubblico con Copyright
Dimensione 895.21 kB
Formato Adobe PDF
895.21 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2396946
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact