Jacket platforms and gravity based structures are located and operating offshore in the Italian sea. The design was implemented to respond to the storms and earthquakes. Different types of analyses have been performed in the design phase: analyses based on a three-step solution where the output describes seabed earthquake motions along with the impedance functions of the rigid foundation, and analyses based on the global (one-step) method including the structures in the computational model of the soil. The output evidences are the time history of earthquake motions (accelerations or displacement) at specified points on the structure or the acceleration response spectra at these specified points. The present paper deals with data collection and the statistical analysis of the structural dynamic response data recorded since 2002; data recorded during storms and seismic events, are used to compare design accelerations of the structures, and to determine the natural frequencies and relevant mode shapes after the events. A new technique based on kernel principal component analysis is developed to eliminate environmental influences on natural frequencies and relevant mode shapes.

Continuous Dynamic Monitoring of Offshore Structures / Michele, Rizzo; Ostilio, Spadaccini; Andrea, Vignoli. - ELETTRONICO. - (2017), pp. 1-10. (Intervento presentato al convegno (8th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII-8) tenutosi a Brisbane (AUSTRALIA) nel 5-8 dicembre 2017).

Continuous Dynamic Monitoring of Offshore Structures

Michele Rizzo
Writing – Original Draft Preparation
;
Ostilio Spadaccini
Writing – Review & Editing
;
Andrea Vignoli
Writing – Review & Editing
2017

Abstract

Jacket platforms and gravity based structures are located and operating offshore in the Italian sea. The design was implemented to respond to the storms and earthquakes. Different types of analyses have been performed in the design phase: analyses based on a three-step solution where the output describes seabed earthquake motions along with the impedance functions of the rigid foundation, and analyses based on the global (one-step) method including the structures in the computational model of the soil. The output evidences are the time history of earthquake motions (accelerations or displacement) at specified points on the structure or the acceleration response spectra at these specified points. The present paper deals with data collection and the statistical analysis of the structural dynamic response data recorded since 2002; data recorded during storms and seismic events, are used to compare design accelerations of the structures, and to determine the natural frequencies and relevant mode shapes after the events. A new technique based on kernel principal component analysis is developed to eliminate environmental influences on natural frequencies and relevant mode shapes.
2017
Proceedings of SHMII-8
(8th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII-8)
Brisbane (AUSTRALIA)
5-8 dicembre 2017
Michele, Rizzo; Ostilio, Spadaccini; Andrea, Vignoli
File in questo prodotto:
File Dimensione Formato  
SHMII8_Full-paper_rev02.pdf

Accesso chiuso

Descrizione: articolo principale
Tipologia: Pdf editoriale (Version of record)
Licenza: Tutti i diritti riservati
Dimensione 877.73 kB
Formato Adobe PDF
877.73 kB Adobe PDF   Richiedi una copia

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

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1105812
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? ND
social impact