A country’s economic development depends heavily on transportation networks and hence, as a vital aspect, bridge structures must function safely at all times. Structural Health Monitoring (SHM) and Damage Prognosis (DP) of bridges should be a priority in order to prevent deterioration, avoid collapse and ensure user’s safety. One objective of SHM for civil structures is the behavior assessment due to ambient, operational and seismic excitations, for which acceptable ranges are established for the variation of dynamic properties. Through Operational Modal Analysis (OMA) it is possible to estimate operational frequencies of a bridge and provide a measure of its current dynamic behavior. These frequencies can then be used for future comparisons to revise if the structure has been damaged or has experienced changes due to environmental conditions. In this paper, vertical and horizontal operational frequencies of more than 300 vehicular and pedestrian bridges of the transportation network of Santiago de Cali, Colombia, were estimated using ambient vibration tests. Data were obtained using smartphones and processed using frequency domain analyses. Correlations of these frequencies with the structural characteristics of the bridges are presented. The results of this study represent the current state of each bridge and provide a baseline for future evaluations of changes due to environmental conditions or damage.
Sebastián Castellanos, Johannio Marulanda, Mónica Preciado, Alejandro Cruz, and Peter Thomson, "Identification of the operational frequencies of 300+ bridges using smartphones," Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 98040C (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 21, 2016; Published: 8 April 2016); https://doi.org/10.1117/12.2222097.
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