PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 891–898

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers Keywords: Structural health monitoring; Anomaly detection; Convolutional Autoencoder; post-earthquake diagnosis; deep learning; masonry buildings Abstract Structural monitoring of masonry buildings is crucial for ensuring safety, preserving historical heritage, and preventing struc tural damage. This process allows for the early detection of signs of deterioration or settlement, helping to plan maintenance and restoration interventions on time. Discriminating between structural damage and benign conditions using monitoring data is made di ffi cult by the inherent unpredictability in climatic and operational variables, such as temperature and humidity, as well as by the complex constitutive behaviour of masonry. To improve diagnostic reliability, this study integrates accelera tion time histories with ambient temperature measurements to propose a strong anomaly detection framework for masonry structures. Convolutional Autoencoder (CAE), a deep learning model optimised for unsupervised anomaly detection, is used in the suggested method. By learning latent representations of thermal patterns and structural dynamics, the CAE makes it possible to distinguish between anomalies brought on by damage and typical seasonal variations. The framework uses Singular Value Decomposition (SVD) representations and extracts dominant spectral characteristics to handle the high dimensionality of time-domain accelerometer signals, which are computationally demanding and prone to noise. This condensed representa tion enhances model generalisation and makes training more e ff ective. The use of reconstruction-based Metrics on dominant SV distributions in conjunction with temperature-informed error analysis are a fundamental component of the framework. This combined spectral-thermal The method keeps robustness against environmental noise while improving sensitivity to structural changes. Real-world data from the Consoli Palace in Gubbio, Italy—a historic masonry building outfitted with accelerometers and thermocouples—is used to validate the framework. The anomaly detection framework performs well in identifying damage after seismic events, demonstrating high accuracy and adaptability. XX ANIDIS Conference Robust anomaly detection in masonry structures using a temperature-driven CAE-SVD framework: application to the Consoli palace AkshayRai a , Laura Ierimonti a , Valentina Giglioni a , Elisa Tomassini a , Filippo Ubertini a , Ilaria Venanzi a, ∗ a Department of Civil and Environmental Engineering, University of Perugia, Via Go ff redo Duranti, 93, 06125 Perugia PG, Italy

1. Introduction

Anomaly detection in civil structures focuses on identifying unusual deviations in structural behaviour that may indicate damage or degradation. The primary objective is to enhance safety, ensure structural integrity, and facilitate maintenance planning by detecting early signs of faults. Modern Structural Health Monitoring (SHM) systems achieve this by continuously monitoring parameters such as vibration, strain, and displacement using sensors and sophisticated algorithms. Accurate anomaly detection enables timely interventions, thereby reducing

∗ Corresponding author. Tel.: 0755853907 E-mail address: ilaria.venanzi@unipg.it

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers 10.1016/j.prostr.2025.12.114