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Smart Structures and Systems
  Volume 27, Number 2, February 2021, pages 139-156
DOI: http://dx.doi.org/10.12989/sss.2021.27.2.139
 


Dynamical models of a suspension bridge driven by vibration data
Vincenzo Gattulli, Alvaro Cunha, Elsa Caetano, Francesco Potenza, Andrea Arena and Umberto Di Sabatino

 
Abstract
    The great availability of measurement systems permits to acquire quite easily data related to structural oscillations in operational conditions. This occurrence may permit to enhance our capability to data-driven computing using directly experimental data and pertinent constraints and conservation laws, such as compatibility and equilibrium, surely certain. In the paper, a methodology will be presented to furnish an analytical mechanical model of a suspension bridge in which the main parameters can be derived from vibration measurements. In this respect, Polymax and Enhanced Frequency Domain Decomposition identification procedures are used to determine a complete modal model which is used to evaluate an error function. Optimization algorithms are used to evaluate the function minima in the fundamental parameter space. The procedure will be validated by results coming from a sophisticated finite element model for which geometric measurements are included through a 3D point cloud geometrical model and a consequent Building Information model (BIM) constructed with images acquired by unmanned aerial vehicle (UAV). The case study of the pedestrian cable suspension Polvorines bridge (100 meters of span) is considered to demonstrate the procedure, due the test campaign conducted on March 2020.
 
Key Words
    vibration measurements; polymax; model updating; error optimization; modal identification
 
Address
(1) Vincenzo Gattulli, Andrea Arena:
Department of Structural and Geotechnical Engineering, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy;
(2) Alvaro Cunha, Elsa Caetano:
Construct-ViBest, Faculty of Engineering (FEUP), University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;
(3) Francesco Potenza:
Department of Engineering and Geology, University G. d'Annunzio of Chieti-Pescara, Viale Pindaro 42, 65127 Pescara, Italy;
(4) Umberto Di Sabatino:
Department of Civil, Construction-Architectural and Environmental Engineering, University of L'Aquila, Piazzale E. Pontieri 2, 67100 L'Aquila, Italy.
 

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