A new method for earthquake-induced damage identification in historic masonry towers combining OMA and IDA

Abstract

This paper presents a novel method for rapidly addressing the earthquake-induced damage identification task in historic masonry towers. The proposed method, termed DORI, combines operational modal analysis (OMA), FE modeling, rapid surrogate modeling (SM) and non-linear Incremental dynamic analysis (IDA). While OMA-based Structural Health Monitoring methods using statistical pattern recognition are known to allow the detection of small structural damages due to earthquakes, even far-field ones of moderate intensity, the combination of SM and IDA-based methods for damage localization and quantification is here proposed. The monumental bell tower of the Basilica of San Pietro located in Perugia, Italy, is considered for the validation of the method. While being continuously monitored since 2014, the bell tower experienced the main shocks of the 2016 Central Italy seismic sequence and the on-site vibration-based monitoring system detected changes in global dynamic behavior after the earthquakes. In the paper, experimental vibration data (continuous and seismic records), FE models and surrogate models of the structure are used for post-earthquake damage localization and quantification exploiting an ideal subdivision of the structure into meaningful macroelements. Results of linear and non-linear numerical modeling (SM and IDA, respectively) are successfully combined to this aim and the continuous exchange of information between the physical reality (monitoring data) and the virtual models (FE models and surrogate models) effectively enforces the Digital Twin paradigm. The earthquake-induced damage identified by both data-driven and model-based strategies is finally confirmed by in-situ visual inspections.

On the Use of the Digital Twin Concept for the Structural Integrity Protection of Architectural Heritage

“…Other studies emphasise the importance of including structural health monitoring (SHM) as part of DT implementation to address the real-time connection between physical and virtual assets. Both García-Macías et al [22] and Kita et al [23] proposed the use of surrogate models to overcome the large computational effort required for historical structures in traditional FE-based approaches and improve the effectiveness of SHM based on automated operational modal analysis (OMA) for real-time condition assessment and continuous model updating.…”

Modelling and Stability Assessment of the Rock Cliffs and Xrobb l-Ġħaġin Neolithic Structure in Malta

“…Numerical modeling research has been conducted to evaluate the structural response of the geological formation on which the megalithic monument lies. In particular, finite element analysis was selected and applied in this case since the research community widely accepts it as an effective method for the structural assessment of historic infrastructure in restoration plans [17,18]. Both static and dynamic numerical analysis are widely utilized for the modeling of the structural response of masonry structures.…”

Seismic vulnerability analysis on an extra-large highway-railway dual-used arch bridge

“…Kita et al [6] presented a methodology to address the rapid post-earthquake damage localization and quantification tasks, based on non-linear Incremental Dynamic Analysis (IDA). In theirs later article, by combining Operational Modal Analysis (OMA), previous method was updated, which allows the detection of small structural damages due to earthquakes and far-field seismic identification [7]. However, many researchers (i.e., Guo, 2017 [8]) have reported the impractically expensive computational effort of IDA.…”