Statistical analysis: A tool for understanding monitoring data

Domenico Bruzzi, Alessandro Fassò, Orietta Nicolis, Giorgio Pezzetti

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Monitoring data often need deep analysis in order to understand the real behaviour of a structure or a soil mass which may be overshadowed by unknown phenomena or boundary conditions. Temperature is one of the most common parameters which affect field measurements and create problems in data interpretation and use. The present work introduces a statistical approach for better understanding the behaviour of the monitored phenomena, reducing the uncertainty associated with the measurements and detecting possible anomalies in the monitoring system. The approach is described with reference to a specific application on a cable stayed bridge. In order to describe the dynamics of the bridge in normal conditions, a state space model is proposed. Then, a hierarchical multivariate detector (HMD), based on a Multivariate Exponentially Weighted Moving Average control chart (MEWMA), is introduced for analysing the behaviour of the monitoring system when one or more parameters change. Using appropriate threshold values, the HMD is able to check the tendency of the system to change its status from a safe situation to a warning or alert one and to localize the source of variability. In order to show its ability to detect anomalies, some simulation examples are provided.

Original languageEnglish
Title of host publicationFMGM 2007 - Proceedings of the 7th International Symposium on Field Measurments in Geomechanics
Pages100
Number of pages1
Edition175
DOIs
Publication statusPublished - 1 Dec 2007
Event7th International Symposium on Field Measurements in Geomechanics, FMGM 2007 - Boston, MA, United States
Duration: 24 Sep 200727 Sep 2007

Publication series

NameGeotechnical Special Publication
Number175
ISSN (Print)0895-0563

Conference

Conference7th International Symposium on Field Measurements in Geomechanics, FMGM 2007
Country/TerritoryUnited States
CityBoston, MA
Period24/09/0727/09/07

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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