Simplified Approach to Design and Calibrate Cable-Stayed Structure Models
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This paper presents and evaluates simplified approaches to design and calibrate a cable-stayed structure model based on results obtained from applying output-only modal identification methods. The data were collected during dynamic tests using an alternative data acquisition system. The process identified at least four flexural mode shapes of the structure and stay cables. The dynamic properties were determined theoretically using a 3D finite element model composed of beam and catenary elements. The calibration of the model was based on simplified sensitivity analysis and allowed the dynamic properties to be adjusted to the experimental values. The procedure provided an accurate updated model, with percentage of variation in the frequency varying from 0.00% for the first identified natural frequency to a maximum of 2.52%. The numerical model also provided good correlation between the mode shapes; the lowest Modal Assurance Criterion value was 0.9373, and might be used as reference in structural assessments.
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