PSI - Issue 44

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 44 (2023) 2122–2127

XIX ANIDIS Conference, Seismic Engineering in Italy An integrated approach for the investigation of the seismic behaviour of churches: the case study of St. Maria Maggiore in Tuscania Gianmarco de Felice a *, Clarisse Choueiri b , Rodrigo Yanez Chura b , Pietro Meriggi a

a Roma Tre University – Department of Egineering, Via Vito Volterra 62, Rome 00146, Italy b École Normale Supérieure Paris-Saclay, 4 Avenue des Sciences, 91190 Gif-sur-Yvette, France.

© 2023 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 the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. Abstract The behaviour of historic masonry constructions under earthquake is strictly dependent on structure geometry and masonry morphology, whose precise representation influences the robustness of the seismic assessment. In this process, a crucial role is played by the structural survey. Within this framework, the paper proposes an integrated methodology for assessing the seismic safety of churches, from photogrammetric survey to collapse mechanisms analysis. As a first step, a photogrammetric survey, both aero-photogrammetric and on the ground, is carried out and a 3D model is obtained through structure from motion software. This model allows to derive geometrical details and blocks shape and arrangement, the latter obtained through a semi-automatic edge detection technique based on orthophotos processing. The resulting geometry of the building is therefore imported in the Distinct Element code UDEC. Finally, the local collapse mechanisms are analysed, both in terms of failure development and capacity curve, by applying an automatic push over algorithm. The proposed integrated procedure is performed to the Romanesque Church of St. Maria Maggiore in Tuscania - Italy. © 2022 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 the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy

Keywords: Distinct Element Method (DEM); Masorny; Edge detection; Photogrammetry; Push over algoritm; Seismic assessment of churches.

* Corresponding author. Tel.: +0-0390657336268; fax: +0-0390657336265. E-mail address: gianmarco.defelice@uniroma3.it

2452-3216 © 2022 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 the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy

2452-3216 © 2023 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 the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. 10.1016/j.prostr.2023.01.271