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Investigation of ambient noise seismological methods on a bridge model

  • This presentation is to introduce the research work in the GIOTTO project funded by Federal Ministry of Education and Research (BMBF) in the frame of “early warning of earthquakes” program. The aim of this work is to investigate the application of seismological noise-based monitoring for bridge structures. A large-scale two-span concrete bridge model with a build-in post-tensioning system, which is exposed to environmental conditions, is chosen as our experimental test structure. Ambient seismic noise measurements were carried out under different pre-stressed conditions. Using the seismic interferometry technique, which is applied to the measurement data in the frequency domain, we reconstruct waveforms that relate to wave propagation in the structure. The coda wave interferometry technique is then implemented by comparing two waveforms recorded in two pre-stress states. Any relative seismic velocity changes are identified by determining the correlation coefficients and reveal theThis presentation is to introduce the research work in the GIOTTO project funded by Federal Ministry of Education and Research (BMBF) in the frame of “early warning of earthquakes” program. The aim of this work is to investigate the application of seismological noise-based monitoring for bridge structures. A large-scale two-span concrete bridge model with a build-in post-tensioning system, which is exposed to environmental conditions, is chosen as our experimental test structure. Ambient seismic noise measurements were carried out under different pre-stressed conditions. Using the seismic interferometry technique, which is applied to the measurement data in the frequency domain, we reconstruct waveforms that relate to wave propagation in the structure. The coda wave interferometry technique is then implemented by comparing two waveforms recorded in two pre-stress states. Any relative seismic velocity changes are identified by determining the correlation coefficients and reveal the influence of the pre-stressing force. The decrease of the wave propagation velocity indicates the loss of the pre-stress and weakening stiffness due to opening or event extension of cracks. We conclude that the seismological methods used to estimate velocity change can be a promising tool for structural health monitoring of civil structures.zeige mehrzeige weniger

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Metadaten
Autor*innen:Chun-Man Liao
Weitere Person:F. Mehrkens, C. Hadziioannou, Ernst NiederleithingerORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2021
Organisationseinheit der BAM:8 Zerstörungsfreie Prüfung
8 Zerstörungsfreie Prüfung / 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Ambient seismic noise measurements; Coda wave interferometry; Pre-stress loss
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Veranstaltung:EGU General Assembly 2021
Veranstaltungsort:Online meeting
Beginndatum der Veranstaltung:19.04.2021
Enddatum der Veranstaltung:30.04.2021
DOI:10.5194/egusphere-egu21-2773
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:05.05.2021
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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