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) 633–640

© 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 Existing reinforced concrete (RC) bridge piers located near the sea are vulnerable to corrosion phenomena that might negatively affect the load-bearing capacity of the overall bridge, especially under seismic loading. It is of primary importance to assess the seismic vulnerability of existing RC bridge piers under different corrosion scenarios, in order to quantify the reduction of the seismic structural safety induced by these frequent material degradation phenomena. This contribution deals with an experimental-numerical procedure for the seismic vulnerability assessment of corroded bridge piers. The procedure is illustrated in the context of the Zappulla multi-span viaduct (Sicily, Italy), whose RC piers are experiencing chloride-induced corrosion. A comprehensive quality control is conducted, including carbonation tests, corrosion potential mapping and extraction of corroded steel bars for tensile tests, in conjunction with SonReb tests and concrete coring. The test results are critically interpreted to calibrate a numerical fiber-hinge model of the bridge pier, through which numerical seismic analysis is performed under two different corrosion scenarios. It has been found that the seismic safety margin of pier structures is reduced of up to 20-40% by taking into account a mass loss in percentage of the steel bars equal to 20-30%, as suggested by experimental findings. © 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: Corroded bars; Seismic vulnerability assessment; RC bridge piers; Seismic response; Nonlinear time-history analysis. 1. Introduction Several existing reinforced concrete (RC) bridge piers located in coastal areas or in the nearby of the sea are exposed to chloride-induced corrosion phenomena in the steel bars (De Domenico et al. 2021). XIX ANIDIS Conference, Seismic Engineering in Italy Seismic vulnerability assessment of reinforced concrete bridge piers exposed to chloride-induced corrosion Dario De Domenico a *, Graziano Lamberto a , Davide Messina a , Antonino Recupero a a Department of Engineering, University of Messina, Contrada Di Dio, 98166 Sant’Agata, Messina, Italy

* Corresponding author. Tel.: +39-0906765921 E-mail address: dario.dedomenico@unime.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.2023.01.083