PSI - Issue 62

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

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Procedia Structural Integrity 62 (2024) 916–923

II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Experimental investigation on structural degradation and dynamic characterization of a cycle-pedestrian bridge Massimiliano Bregolin a , Carlo Pellegrino a , Egidio Lofrano b , Achille Paolone b , Emanuele Renzi c , Galileo Tamasi c * a University of Padova, Via 8 Febbraio, 2 - 35122 Padova, Italy b “Sapienza”, Univesity of Rome, Via Eudossiana, 18 - 00184 Roma, Italy c National Safety Agency for Safety of Railway and Road infrastructures, Viale del Policlinico,2 – 00185 – Roma, Italy Abstract In the last century in Italy and, in particular, in Padua, the cycle-pedestrian bridges represented a connective system of the city that assumed a historical and strategic importance. Indeed, the city owes a significant part of its vitality to this type of works. However, some of these constructions are affected by significant material degradation phenomena and by structural issues related to the dynamic interaction between pedestrians and structure (a.k.a. “lock - in” effect). This paper will explore the case of a historic cycle-pedestrian bridge illustrating the construction methods, the realization phases and the maintenance works carried out. The adopted identification techniques are then illustrated with reference to the operational modal analysis (OMA) and the experimental investigations carried out in the static and dynamic field. The tests were conducted with particular reference to the possibilities of improving the dynamic behaviour of the bridge in terms of frequencies on the horizontal plane. The experimental results before and after the introduction of some constraints to the horizontal displacement are then illustrated, as well as the results of a series of non-destructive tests on some significant points of the structural elements. The work closes by examining possible future structural solutions and related monitoring systems. © 2024 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 Scientific Board Members Keywords: Cycle-pedestrian, Bridge, OMA, Experimental, Investigations, Lock-in II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Experimental investigation on structural degradation and dynamic characterization of a cycle-pedestrian bridge Massimiliano Bregolin a , Carlo Pellegrino a , Egidio Lofrano b , Achille Paolone b , Emanuele Renzi c , Galileo Tamasi c * a University of Padova, Via 8 Febbraio, 2 - 35122 Padova, Italy b “Sapienza”, Univesity of Rome, Via Eudossiana, 18 - 00184 Roma, Italy c National Safety Agency for Safety of Railway and Road infrastructures, Viale del Policlinico,2 – 00185 – Roma, Italy Abstract In the last century in Italy and, in particular, in Padua, the cycle-pedestrian bridges represented a connective system of the city that assumed a historical and strategic importance. Indeed, the city owes a significant part of its vitality to this type of works. However, some of these constructions are affected by significant material degradation phenomena and by structural issues related to the dynamic interaction between pedestrians and structure (a.k.a. “lock - in” effect). This paper will explore the case of a historic cycle-pedestrian bridge illustrating the construction methods, the realization phases and the maintenance works carried out. The adopted identification techniques are then illustrated with reference to the operational modal analysis (OMA) and the experimental investigations carried out in the static and dynamic field. The tests were conducted with particular reference to the possibilities of improving the dynamic behaviour of the bridge in terms of frequencies on the horizontal plane. The experimental results before and after the introduction of some constraints to the horizontal displacement are then illustrated, as well as the results of a series of non-destructive tests on some significant points of the structural elements. The work closes by examining possible future structural solutions and related monitoring systems. © 2024 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 Scientific Board Members Keywords: Cycle-pedestrian, Bridge, OMA, Experimental, Investigations, Lock-in © 2024 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 Scientific Board Members

* Corresponding author. Tel.: +39(320)6197910; E-mail address: galileo.tamasi@ansfisa.gov.it * Corresponding author. Tel.: +39(320)6197910; E-mail address: galileo.tamasi@ansfisa.gov.it

2452-3216 © 2024 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 Scientific Board Members 2452-3216 © 2024 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 Scientific Board Members

2452-3216 © 2024 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 Scientific Board Members 10.1016/j.prostr.2024.09.123