PSI - Issue 44

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 44 (2023) 657–664

© 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 Bridges are key infrastructures that are built worldwide adopting different typologies, geometries, and construction materials. For these important infrastructures experimental proof tests before their opening to traffic are mandatory, as prescribed by many codes. In detail, static proof tests are performed to verify that the bridge behavior subjected to the design characteristic load conditions complies with that expected and does not exceed limits provided by codes (in terms of stresses and deck deflections). Nowadays, it is also often required in many countries to check the fundamental frequency of the real structure and to verify that it is in accordance with that obtained numerically during the design procedures. The fundamental frequency of the bridge is usually experimentally identified from ambient vibration tests on the unloaded structure through the operational modal analyses. This paper discusses about the dynamic identification of bridges performed during the loading phases of the static proof test, which is of interest to improve the control of the loading procedures, and to obtain frequency benchmarks that can be used as a support for the bridge structural health monitoring during its life. In detail, the paper addresses the problem of the dynamic interaction between the bridge and the stationed load (almost always provided by trucks) that affects the results interpretation and, sometimes, leads to erroneous conclusions on the bridge performance. Firstly, the bridge-truck interaction phenomenon is briefly exposed referring to a 2-dof dynamic system, then, an application to a real bridge case study dynamically tested during the proof load test day, is presented. © 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: Ambient vibration tests, Dynamic bridge proof test, Bridge-truck interaction; Bridge monitoring 1. Introduction Bridges are key assets in the transport infrastructure networks and their state of maintenance and robustness affect the resilience level of the entire network, against the environmental hazards (i.e. earthquakes, land-slides and floods) causing unacceptable economic and social losses (Mitoulis et al. (2021)). For new bridges, many national codes around the world prescribe mandatory proof load tests, usually performed by replicating some severe load configurations (i.e. 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 Engin ering in Italy XIX ANIDIS Conference, Seismic Engineering in Italy The significance of the dynamic interaction between bridge and trucks in the evaluation of the resonance structural frequencies Riccardo Martini*, Davide Arezzo, Sandro Carbonari, Fabrizio Gara DICEA – Università Politecnica delle Marche, Via Brecce Bianche 12, Ancona (60131), Italia Abstract Bridges are key infrastructures that are built worldwide adopting different typologies, geometries, and construction materials. For these important i fr tr t experimental pr of tests bef re their opening to traffic ar mandatory, as pre cribed by many codes. In d tail, static proof ests are perfor d to verify that the bridge behavior subjected to the esign characte stic load conditions complies with that exp c ed and does not exc ed limits provided by codes (in terms of stresses and deck deflections). N wadays, it is also of en required in many cou tri s to check the fun amental frequency of the al tructur and to verify that it is in accordance with that obtained numerically during the design procedures. The fundament l frequency of he b dge is usually expe imentally identified from ambi nt vibration tes s on the unload structur through the operatio al modal analys s. This pap r discusses about the dynamic identification of bridges performed d ing the loading hases of the st tic proof test, which is of interest to improve the control of the loading pr cedures, and t obtain frequency be chm rk tha can be used as a support for the b idge structural alth m nitoring dur its life. In detail, the pape addresses the problem of the dynamic interacti n betwe n the bridge and the stationed l ad (almost always provi d by trucks) th t affects the results interpretatio nd, sometimes, leads to erroneous conclusions on the bridge performance. Firstly, the bridge- ruck interaction phenom non is briefly expos d r ferring to a 2-dof dy amic system, then, an a plicatio to a rea bridge case study dy ami ally tested during the proof load t st day, is presente . © 2022 Th 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 u der re ponsibility of scientific committe of the XIX ANIDIS Conference, Seismic Engineering in Italy K ywords: Ambient vibration tests, Dynamic bridge proof test, Bridge- ruck interaction; Bridge monitoring 1. Introduction Bridges are key assets in the transport infrastructure networks and their state of maintenance and robustness affect the resili nce level of the en ir network, against the environment l hazard (i. . earthquakes, land-slides a d floods) causing u acceptable economic and s cial losse (Mitoulis et al. (2021)). For new bridges, many national codes around the world prescribe mandatory proof load test , usually performed by replicating some severe load c figurations (i.e. 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 XIX ANIDIS Conference, Seismic Engineering in Italy The significance of the dynamic interaction between bridge and trucks in the evaluation of the resonance structural frequencies Riccardo Martini*, Davide Arezzo, Sandro Carbonari, Fabrizio Gara DICEA – Università Politecnica delle Marche, Via Brecce Bianche 12, Ancona (60131), Italia

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.2023.01.086